Search results “Digital signature in cryptography 101”
Cryptography/SSL 101 #3: Digital signatures
This video builds on the first two and unites the concepts of public/private key encryption and cryptographic hash functions to explain digital signatures - a key concept that underpins the security model web transactions and bitcoin among many other things
Views: 10009 Matt Thomas
Bitcoin - Digital Signatures
A high-level explanation of digital signature schemes, which are a fundamental building block in many cryptographic protocols. More free lessons at: http://www.khanacademy.org/video?v=Aq3a-_O2NcI Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT.
Views: 139578 Khan Academy
Digital Signatures
This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 45648 Udacity
Lecture 18: Digital Signatures and Security Services by Christof Paar
For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
How Do Digital Signatures Work?
In this video, I will be showing you how digital signatures are generated and how they help in establishing non-repudiation.
Views: 172586 Fasih Khatib
Cryptography for Data Integrity & Digital Signature | Philippe Janson
This clip is part of the elementary course on Information, Computing & Communication (ICC) of the Ecole Polytechnique Fédérale de Lausanne, Switzerland. It explains how symmetric and asymmetric cryptography can be used to provide data integrity and digital signature.
Views: 517 Wandida, EPFL
What is digital signature?
A digital signature is equivalent to a handwritten signature in paper, and a digital signature serves three basic purposes. Digital signature is commonly used for software distribution, financial transactions and other cases where it is important to detect forgery. Digital signatures are very popular with e-mail users. In this video, I will talk about the digital, uses, and the whole process of creating and sending digitally signed document over the Internet. Keep in mind, digital signature is not about encrypting document, just like paper-based signature. Playlist: Basic Cryptography https://www.youtube.com/watch?v=vk3py9M2IfE&list=PLSNNzog5eyduN6o4e6AKFHekbH5-37BdV Advanced Cryptography: https://www.youtube.com/watch?v=TmA2QWSLSPg&list=PLSNNzog5eydtwsdT__t5WtRgvpfMzpTc7 Please subscribe to my channel! Please leave comments or questions! Many thanks, Sunny Classroom
Views: 84833 Sunny Classroom
Hashing and Digital Signatures - CompTIA Security+ SY0-501 - 6.1
Security+ Training Course Index: http://professormesser.link/sy0501 Professor Messer’s Course Notes: http://professormesser.link/501cn Frequently Asked Questions: http://professormesser.link/faq - - - - - A cryptographic hash can be used for many different tasks. In this video, you’ll learn about hashing, collisions, digital signatures, and more. - - - - - Subscribe to get the latest videos: http://professormesser.link/yt Calendar of live events: http://www.professormesser.com/calendar/ FOLLOW PROFESSOR MESSER: Professor Messer official website: http://www.professormesser.com/ Twitter: http://www.professormesser.com/twitter Facebook: http://www.professormesser.com/facebook Instagram: http://www.professormesser.com/instagram Google +: http://www.professormesser.com/googleplus
Views: 14513 Professor Messer
Blockchain tutorial 6: Digital signature
This is part 6 of the Blockchain tutorial explaining what a digital signature is. In this video series different topics will be explained which will help you to understand blockchain. Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons). After the introduction of Bitcoin many Bitcoin alternatives were created. These alternate cryptocurrencies are called Altcoins (Litecoin, Dodgecoin etc). Bitcoin's underlying technology is called Blockchain. The Blockchain is a distributed decentralized incorruptible database (ledger) that records blocks of digital information. Each block contains a timestamp and a link to a previous block. Soon people realises that there many other use cases where the Blockchain technology can be applied and not just as a cryptocurrency application. New Blockchain platforms were created based on the Blockchain technology, one of which is called Ethereum. Ethereum focuses on running programming code, called smart contracts, on any decentralized application. Using the new Blockchain platforms, Blockchain technology can be used in supply chain management, healthcare, real estate, identity management, voting, internet of things, etcetera, just to name a few. Today there is a growing interest in Blockchain not only in the financial sector but also in other sectors. Explaining how Blockchain works is not easy and for many the Blockchain technology remains an elusive concept. This video series tries to explain Blockchain to a large audience but from the bottom up. Keywords often used in Blockchain conversation will be explained. Each Blockchain video is short and to the point. It is recommended to watch each video sequentially as I may refer to certain Blockchain topics explained earlier. Check out all my other Blockchain tutorial videos https://goo.gl/aMTFHU Subscribe to my YouTube channel https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_tutorial.html #mobilefish #blockchain #bitcoin #cryptocurrency #ethereum
Views: 14171 Mobilefish.com
The Story of Digital Signatures and Public Key Infrastructure
This movie explains the concepts behind Digital Signatures and the various components of Public Key Infrastructure in layman's terms from the Indian Context.
Views: 14672 PKIIndia
Cryptography 101
Cryptography is a complex and confusing subject. In this talk you will learn about the core components of cryptography used in software development: securing data with encryption, ensuring data integrity with hashes and digital signatures, and protecting passwords with key derivation functions. While learning how to use these components, you will also learn the best practices that drive strong cryptography. This talk won’t make you a cryptography expert but it will give you the knowledge necessary to use cryptography properly. No prior knowledge of cryptography is required for this presentation. EVENT: the Dutch PHP Conference in 2018 SPEAKER: Adam Englander PERMISSIONS: Original video was published with the Creative Commons Attribution license (reuse allowed). CREDITS: Original video source: https://www.youtube.com/watch?v=KcjJ19geKmA&t=1s
Views: 6616 Coding Tech
Digital Signatures and Signing transactions explained
You need to have an understanding of Encryption for this video to make sense 13uJjYF12aRVdwaiTmALx5XDfguQ9MnYtK
Views: 2071 Keifer Kif
What is a Digital Signature?
This channel introduces the "e-Estonia" - a term commonly used to describe Estonia's emergence as one of the most advanced e-societies in the world. You can learn more about Estonian ICT and technology by watching the videos, visiting our homepage http://e-estonia.com or follow us on FB e-Estonia .You can also book a visit and live demo at Estonian ICT Demo Center in Tallinn and establish business contacts with Estonian ICT companies.
Views: 207803 e-estonia
How digital Signatures work
A little slideshow I put together while studying for a Computer security class. I hope someone finds it helpful.
Views: 22821 Mike Farnsworth
Introduction to Digital Signature | Public Key cryptography
This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA. Introduction to Digital Signature | Public Key cryptography To study interview questions on Linked List watch http://www.youtube.com/playlist?list=PL3D11462114F778D7&feature=view_all To prepare for programming Interview Questions on Binary Trees http://www.youtube.com/playlist?list=PLC3855D81E15BC990&feature=view_all To study programming Interview questions on Stack, Queues, Arrays visit http://www.youtube.com/playlist?list=PL65BCEDD6788C3F27&feature=view_all To watch all Programming Interview Questions visit http://www.youtube.com/playlist?list=PLD629C50E1A85BF84&feature=view_all To learn about Pointers in C visit http://www.youtube.com/playlist?list=PLC68607ACFA43C084&feature=view_all To learn C programming from IITian S.Saurabh visit http://www.youtube.com/playlist?list=PL3C47C530C457BACD&feature=view_all
Views: 34705 saurabhschool
Applied Cryptography: The Digital Signature Algorithm - Part 1
This video describes the key generation for the DSA. An example with artificially small numbers is also given
Views: 6457 Leandro Junes
Hash Functions and Digital Signatures (CSS322, L19, Y14)
Use of cryptographic hash functions for authentication. Digital signatures with public key crypto and hash functions. Required properties of hash functions. Course material via: http://sandilands.info/sgordon/teaching
Views: 2051 Steven Gordon
Bitcoin 101   Elliptic Curve Cryptography   Part 5   The Magic of Signing & Verifying
Vídeo original: https://youtu.be/U2bw_N6kQL8 There is nothing more magical in Bitcoin, or all of cryptography than digital signatures. And the most magical step of all is the verification. This is the step we focus on in this video, generating the entire process in just 50 lines of code (no imports or special function calls!) and watching as the Private Key falls out of the math entirely! So beautiful. The receiver is left with proof of the sender, confirmation of the message and no way of retrieving the senders private key. This is magic indeed. Here's the link to the Python code: https://github.com/wobine/blackboard1... Welcome to WBN's Bitcoin 101 Blackboard Series -- a full beginner to expert course in bitcoin. Please like, subscribe, comment or even drop a little jangly in our bitcoin tip jar 1javsf8GNsudLaDue3dXkKzjtGM8NagQe. Thanks, WBN
Views: 3806 Fabio Carpi
What Is Digital Signature In Cryptography?
In the united states and certain other countries. Digital signature initiative links on law, cryptography and electronic communications 10 dec 2012 these types of cryptographic primitive can be distinguished by the security goals they fulfill (in simple protocol 'appending to a message') entrust is registered trademark entrust, inc. Bitcoin digital signatures (video) microsoft docs. Origin of cryptography, modern cryptosystems, attacks on 19 nov 2014 digital signatures are based public key also known as asymmetric cryptography. Cryptography digital signatures wikibooks, open books for an introduction to signature how do they work? Cgi. How do digital signatures work? Youtube. What is digital signature? Definition from whatis what a are the differences between signature, mac and an introduction to cryptography signatures v2. Entrust is a registered trademark of entrust limited in canada elements applied cryptographydigital signatures with appendix. Digital signatures based cryptographic goals; Message authentication codes (macs)rsa digital signaturecomparison of ecdsa as 2014, installing apps is probably the most common way people use. Digital signatures are one of the most important inventions modern cryptography. Using a public key algorithm such as rsa, digital signature is mathematical scheme for demonstrating the authenticity of signatures are standard element most cryptographic protocol suites, and commonly used software distribution, financial transactions, make sure documents you send electronically authentic. This coupling is established using public key cryptography and 3 oct 2016 over the years, digital signatures have become more secure by adding information to key, different types of cryptography, chapter 9. The problem is how can a user sign What digital signature? Definition from whatis what are the differences between signature, mac and an introduction to cryptography signatures v2. Keys are used to encrypt information. Encrypting information 1 oct 2005 digital signatures are coupled to the electronic document which they apply. Both android and ios require an app to be digitally signed before it 20symmetric key cryptography is a mechanism by which the same used for both this characteristic implement encryption digital signature 130 mar 2017 cryptographic signatures use public algorithms provide data integrity. What is a digital signature? . Chapter 09 digital signatures fi muni. Digital signatures with message recovery. Understanding digital certificates technet microsoft. Learn about digital signatures and other authentication methods. Cryptography digital signatures learn cryptography in simple and easy steps. Crash c
Views: 21 Hadassah Hartman
Information & Network Security Lecture - -  Digital Signature (Eng-Hindi)
Types of digital signature approaches - RSA approach - DSS approach Digital Signature Algorithm with easy explanation -~-~~-~~~-~~-~- Please watch: "PL vs FOL | Artificial Intelligence | (Eng-Hindi) | #3" https://www.youtube.com/watch?v=GS3HKR6CV8E -~-~~-~~~-~~-~-
Views: 46750 Well Academy
Applied Cryptography: The RSA Digital Signature - Part 1
This video gives an overview of the RSA Digital Signature. It shows how this scheme is closely related to RSA encryption/decryption.
Views: 5793 Leandro Junes
Message Digest and Digital Signature | Cryptographic Hash Function
This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA. Message Digest and Digital Signature To study interview questions on Linked List watch http://www.youtube.com/playlist?list=PL3D11462114F778D7&feature=view_all To prepare for programming Interview Questions on Binary Trees http://www.youtube.com/playlist?list=PLC3855D81E15BC990&feature=view_all To study programming Interview questions on Stack, Queues, Arrays visit http://www.youtube.com/playlist?list=PL65BCEDD6788C3F27&feature=view_all To watch all Programming Interview Questions visit http://www.youtube.com/playlist?list=PLD629C50E1A85BF84&feature=view_all To learn about Pointers in C visit http://www.youtube.com/playlist?list=PLC68607ACFA43C084&feature=view_all To learn C programming from IITian S.Saurabh visit http://www.youtube.com/playlist?list=PL3C47C530C457BACD&feature=view_all
Views: 11731 saurabhschool
What is Hashing & Digital Signature in The Blockchain?
What is Hashing & Digital Signature in The Blockchain? https://blockgeeks.com/ Today, we're going to be talking about the word blockchain and breaking it down to understand what does it mean when someone says, "Blockchain." What is hashing? Hashing refers to the concept of taking an arbitrary amount of input data, applying some algorithm to it, and generating a fixed-size output data called the hash. The input can be any number of bits that could represent a single character, an MP3 file, an entire novel, a spreadsheet of your banking history, or even the entire Internet. The point is that the input can be infinitely big. The hashing algorithm [00:01:00] can be chosen depending on your needs and there are many publicly available hashing algorithms. The point is that the algorithm takes the infinite input of bits, applies some calculations to them, and outputs a finite number of bits. For example, 256 bits. What can this hash be used for? A common usage for hashes today is to fingerprint files, also known as check zones. This means that a hash is used to verify that a file has not been [00:01:30] tampered with or modified in any way not intended by the author. If WikiLeaks, for example, publishes a set of files along with their MD5 hashes, whoever downloads those files can verify that they are actually from WikiLeaks by calculating the MD5 hash of the downloaded files, and if the hash doesn't match what was published by WikiLeaks, then you know that the file has been modified in some way. How does the blockchain make use of hashes? [00:02:00] Hashes are used in blockchains to represent the current state of the world. The input is the entire state of the blockchain, meaning all the transactions that have taken place so far and the resulting output hash represents the current state of the blockchain. The hash is used to agree between all parties that the world state is one in the same, but how are these hashes actually calculated? The first hash is calculated for the first block [00:02:30] or the Genesis block using the transactions inside that block. The sequence of initial transactions is used to calculate a block hash for the Genesis block. For every new block that is generated afterwords, the previous block's hash is also used, as well as its own transactions, as input to determine its block hash. This is how a chain of blocks is formed, each new block hash pointing to the block hash that came before it. This system of hashing guarantees that no transaction in the history can be tampered with because if any single part of the transaction changes, so does the hash of the block to which it belongs, and any following blocks' hashes as a result. It would be fairly easy to catch any tampering as a result because you can just compare the hashes. This is cool because everyone on the blockchain only needs to agree on 256 bits to represent the potentially infinite state of the blockchain. The Ethereum blockchain is currently tens of gigabytes, but the current state of the blockchain, as of this recording, is this hexadecimal hash representing 256 bits. What about digital signatures? Digital signatures, like real signatures, are a way to prove that somebody is who they say they are, except that we use cryptography or math, which is more secure than handwritten signatures that can be [00:04:00] easily forged. A digital signature is a way to prove that a message originates from a specific person and no one else, like a hacker. Digital signatures are used today all over the Internet. Whenever you visit a website over ACTPS, you are using SSL, which uses digital signatures to establish trust between you and the server. This means that when you visit Facebook.com, your browser can check the digital signature that came with the web page to verify that it indeed originated from Facebook and not some hacker. In asymmetric encryption systems, users generate something called a key pair, which is a public key and a private key using some known algorithm. The public key and private key are associated with each other through some mathematical relationship. The public key is meant to be distributed publicly to serve as an address to receive messages from other users, like an IP address or home address. The private key is meant to be kept secret and is used to digitally sign messages sent to other users. The signature is included with the message so that the recipient can verify using the sender's public key. This way, the recipient can be sure that only the sender could have sent this message. Generating a key pair is analogous to creating an account on the blockchain, but without having to actually register anywhere. Pretty cool. Also, every transaction that is executed on the blockchain is digitally signed by the sender using their private key. This signature ensures that only the owner of the account can move money out of the account.
Views: 22230 Blockgeeks
Digital  Signature |Cryptography
Digital Signature |Cryptography
Views: 618 Last Night Study
Applied Cryptography: The ElGamal Digital Signature - Part 1
This video gives an introduction to the ElGamal digital signature. The description of the signature algorithm and an example are given.
Views: 3205 Leandro Junes
Digital Signature Standard Algorithm | With Solved Example | Cryptography And Network Security
Types of digital signature approaches - RSA approach - DSS approach Digital Signature Algorithm with easy explanation.The Digital Signature Algorithm (DSA) is a Federal Information Processing Standard for digital signatures.It was proposed by the National Institute of Standards and Technology (NIST) in August 1991 for use in their Digital Signature Standard (DSS) and adopted as FIPS 186 in 1993. Visit Our Channel :- https://www.youtube.com/channel/UCxik... Follow Smit Kadvani on :- Facebook :- https://www.facebook.com/smit.kadvani Instagram :- https://www.instagram.com/the_smit0507 Follow Dhruvan Tanna on :- Facebook :- https://www.facebook.com/dhruvan.tanna1 Instagram :- https://www.instagram.com/dhru1_tanna Follow Keyur Thakkar on :- Facebook :- https://www.facebook.com/keyur.thakka... Instagram :- https://www.instagram.com/keyur_1982 Snapchat :- keyur1610 Follow Ankit Soni on:- Facebook :- https://www.facebook.com/ankitsoni.1511 Instagram :- https://www.instagram.com/ankit_soni1511
Views: 11168 Quick Trixx
Security+ Digital Signatures
Security+ cryptography topic. How digital signatures are created.
Views: 51453 Darril Gibson
Introduction to Cryptographic Keys and Certificates
This video provides a brief introduction to symmetric and asymmetric keys and certificates.
Views: 17627 Paul Turner
Schnorr Digital Signature
In this video I briefly go over the advantage to the Schnorr signature, and how to sign and verify.
Views: 6890 Theoretically
Elliptic Curve Cryptography Overview
John Wagnon discusses the basics and benefits of Elliptic Curve Cryptography (ECC) in this episode of Lightboard Lessons. Check out this article on DevCentral that explains ECC encryption in more detail: https://devcentral.f5.com/articles/real-cryptography-has-curves-making-the-case-for-ecc-20832
Views: 145994 F5 DevCentral
Public Key Crypto and Digital Signatures (ITS335, Lecture 6, 2013)
Public key cryptography and digital signatures. Lecture 6 of ITS335 IT Security at Sirindhorn International Institute of Technology, Thammasat University. Given on 28 November 2013 at Bangkadi, Pathumthani, Thailand by Steven Gordon. Course material via: http://sandilands.info/sgordon/teaching
Views: 1954 Steven Gordon
Public Key Cryptography - Computerphile
Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography note1: Yes, it should have been 'Obi Wan' not 'Obi One' :) note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 404893 Computerphile
Digital Signatures (CISSP Free by Skillset.com)
The Digital Signatures training module is part of the CISSP FREE training course from Skillset.com (https://www.skillset.com/certifications/cissp). Skillset helps you pass your certification exam. Faster. Guaranteed. https://www.skillset.com Topic: Digital Signatures Skill: Cryptography Fundamentals Skillset: Identity and Access Management Certification: CISSP Join the 40,000+ candidates in over 58 countries that have found a faster, better way to pass their certification exam. + Unlimited access to thousands of practice questions + Exam readiness score + Smart reinforcement + Focused training ensures 100% exam readiness + Personalized learning plan + Align exam engine to your current baseline knowledge + Eliminate wasted study time + Exam pass guarantee And much more - https://www.skillset.com
Views: 4073 Skillset
digital signatures in cryptography network security
digital signatures in cns fully explained in hindi
Views: 423 Ky support
Digital Signatures: Part 1
Fundamental concepts of Digital Signatures are discussed. ElGamal and Schnorr Digital Signature schemes are analyzed. Digital signature standard is presented.
Views: 3745 Scholartica Channel
Symmetric Key and Public Key Encryption
Modern day encryption is performed in two different ways. Check out http://YouTube.com/ITFreeTraining or http://itfreetraining.com for more of our always free training videos. Using the same key or using a pair of keys called the public and private keys. This video looks at how these systems work and how they can be used together to perform encryption. Download the PDF handout http://itfreetraining.com/Handouts/Ce... Encryption Types Encryption is the process of scrambling data so it cannot be read without a decryption key. Encryption prevents data being read by a 3rd party if it is intercepted by a 3rd party. The two encryption methods that are used today are symmetric and public key encryption. Symmetric Key Symmetric key encryption uses the same key to encrypt data as decrypt data. This is generally quite fast when compared with public key encryption. In order to protect the data, the key needs to be secured. If a 3rd party was able to gain access to the key, they could decrypt any data that was encrypt with that data. For this reason, a secure channel is required to transfer the key if you need to transfer data between two points. For example, if you encrypted data on a CD and mail it to another party, the key must also be transferred to the second party so that they can decrypt the data. This is often done using e-mail or the telephone. In a lot of cases, sending the data using one method and the key using another method is enough to protect the data as an attacker would need to get both in order to decrypt the data. Public Key Encryption This method of encryption uses two keys. One key is used to encrypt data and the other key is used to decrypt data. The advantage of this is that the public key can be downloaded by anyone. Anyone with the public key can encrypt data that can only be decrypted using a private key. This means the public key does not need to be secured. The private key does need to be keep in a safe place. The advantage of using such a system is the private key is not required by the other party to perform encryption. Since the private key does not need to be transferred to the second party there is no risk of the private key being intercepted by a 3rd party. Public Key encryption is slower when compared with symmetric key so it is not always suitable for every application. The math used is complex but to put it simply it uses the modulus or remainder operator. For example, if you wanted to solve X mod 5 = 2, the possible solutions would be 2, 7, 12 and so on. The private key provides additional information which allows the problem to be solved easily. The math is more complex and uses much larger numbers than this but basically public and private key encryption rely on the modulus operator to work. Combing The Two There are two reasons you want to combine the two. The first is that often communication will be broken into two steps. Key exchange and data exchange. For key exchange, to protect the key used in data exchange it is often encrypted using public key encryption. Although slower than symmetric key encryption, this method ensures the key cannot accessed by a 3rd party while being transferred. Since the key has been transferred using a secure channel, a symmetric key can be used for data exchange. In some cases, data exchange may be done using public key encryption. If this is the case, often the data exchange will be done using a small key size to reduce the processing time. The second reason that both may be used is when a symmetric key is used and the key needs to be provided to multiple users. For example, if you are using encryption file system (EFS) this allows multiple users to access the same file, which includes recovery users. In order to make this possible, multiple copies of the same key are stored in the file and protected from being read by encrypting it with the public key of each user that requires access. References "Public-key cryptography" http://en.wikipedia.org/wiki/Public-k... "Encryption" http://en.wikipedia.org/wiki/Encryption
Views: 439241 itfreetraining
Blockchain 101 - Part 2 - Public / Private Keys and Signing
This is part two in my basic visual introduction to the concepts behind a blockchain. We build on the concepts from the previous video and introduce public / private key pairs and signing using an interactive web demo. If you missed it, part 1 is here: https://youtu.be/_160oMzblY8 If you are interested in playing with this on your own, it is available online at: http://anders.com/blockchain/public-private-keys/ The code that runs this demo is also on GitHub: https://github.com/anders94/public-private-key-demo If you want to know more about how public key cryptography works, see the Wikipedia page on it: https://en.wikipedia.org/wiki/Public-key_cryptography The details of how public keys relate to private keys are hard to summarize, but it has to do with Euler's theorem. Basically, using Euler's theorem there is some math you can do to a number given some parameters (which I'll call the public key) which allows someone with some other parameters (which I'll call the private key) to decipher the original number without having to do brute force factorization because there is a shortcut way to find the phi of a prime number. Rather than me butchering the explanation, check this video series out for a more detailed explanation: https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/the-fundamental-theorem-of-arithmetic-1 I'm @anders94 on Twitter and @andersbrownworth on Steemit. Donations: BTC: 1K3NvcuZzVTueHW1qhkG2Cm3viRkh2EXJp ETH: 0x84a90e21d9d02e30ddcea56d618aa75ba90331ff ETC: 0xab75ad757c89fa33b92090193a797e6700769ef8
Views: 80987 Anders Brownworth
Certification Based Authentication Scheme, Use of Digital Signature, Digital Certificate
User Authentication Certification Based Authentication Scheme, Use of Digital Signature, Digital Certificate Keywords: Certification Based Authentication Network Security Notes Digital Certificates
Andreas Hülsing - Hash-Based Signatures
Title: Hash-Based Signatures Speaker Andreas Hülsing (Technische Universiteit Eindhoven) 2016 Post-Quantum Cryptography Winter School https://pqcrypto2016.jp/winter/
Views: 945 PQCrypto 2016
Applied Cryptography: The RSA Digital Signature - Part 2
This video gives a concrete example of the RSA digital signature. Computational aspects and some security concerns are also covered.
Views: 1640 Leandro Junes
Blockchain/Bitcoin for beginners 3: public/private keys, signatures... and first ever transaction
Detailed overview of public/private key encryption and live demo of exactly how digital signatures work on Mac, combining public and private keys and hash functions. Welcome to episode 3 of my series on Blockchain/Bitcoin. I'm joined once again by my girlfriend Nadisha who is my classroom pupil... I build on the hash function concepts from the previous episode and explain the basic concepts public and private keys and how to use them to create digital signatures - a key part of the bitcoin infrastructure. We demonstrate in a Mac terminal how you can generate your own keys and encrypt and decrypt and sign your own resources - learning by doing always works. We touch on bitcoin addresses, what they represent and how they are created. Finally I go back for a refresh of the bitcoin blockchain browser and look at the first ever bitcoin transaction in the "Genesis Block" to show what a real bitcoin address looks like. Bitcoin Blockchain browser https://blockchain.info Online hash calculator - great way to practice and familiarise with hash functions - one of the most important building blocks of Blockchain/Bitcoin http://www.fileformat.info/tool/hash.htm Course to date (previous videos) 1. Blockchain introduction https://youtu.be/xwA2TkcAQgQ 2. Hashing, blockchain networks and look at blockchain browser https://youtu.be/oxwMnqFNq9M SAMPLE COMMANDS: You will need to use your own document - pick any document, obviously your hash values will be different to mine. Also I had to use (right arrow) - since comments do not allow "chevron" symbols # EXAMPLE 1: # generate public and private keys openssl genrsa -out mykey 2048; cp mykey privatekey; openssl rsa -in mykey -pubout -out publickey; rm mike #encrypt with public key echo “the cat sat on the mat” | openssl rsautl -encrypt -pubin -inkey publicly (right arrow) cipher.txt # show the garbage cat cipher.txt # decrypt with private key - The cat sat on the mat cat cipher.txt | openssl rsautl -decrypt -inkey privately # EXAMPLE 2: Sign Alice in wonderland #check the SHA256 hash of the document to send - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 # create a text file called signature which hashes the document and encrypts with private key shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 | openssl rsautl -inkey privatekey -sign (right arrow) signature # wrap the signature up with the public key, the document and the signature and send it … we just copy to another folder tar -cvf alice.tar signature alice-in-wonderland.txt publickey;mkdir -p inbox;cp alice.tar inbox;cd inbox;tar -xvf alice.tar # inspect the public key and verify with the sender that it belongs to the sender cat publickey #decrypt the signature with the received public key - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c openssl rsautl -inkey publickey -pubin -in signature # hash the received document - d9db7b8984d808b2821070cc6cc76e4415229d3356452b2a0f06ec3608f13b6c shasum -a 256 alice-in-wonderland.txt | cut -d" " -f1 # if they are both the same then the document cannot have been changed since it was signed by the genuine owner of the # private key corresponding to the public key
Views: 18781 Matt Thomas
Cryptography Brief Explaination About Digital Signature Standard (DSS) Approach Reference from Cryptography and Network Security - W. Stallings (Pearson, 2011) page 403 and 404.
Views: 4954 Pu Wei Jian
Applied Cryptography: Hash Functions - Part 1
This video gives a general idea on what hash functions are and their uses. It also describes a use of hash functions for a digital signature protocol.
Views: 21337 Leandro Junes
Applied Cryptography: Intro to Digital Signatures - Part 1
This video gives an introduction to digital signatures. It also talks about the why and importance to have them. Diffie-Hellman Key Exchange: https://www.youtube.com/playlist?list=PL1xkDS1G9As5JGE-oHQNNBCQGKXQY2WmU
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There is nothing more magical in Bitcoin, or all of cryptography than digital signatures. And the most magical step of all is the verification. This is the step we . Vídeo original: Welcome to part four in our series on Elliptic Curve Cryptography. I this episode we dive into the development of . Congress can and should reflect the will of the people. Our research strives to achieve this goal by focusing on the institutional design of legislatures. A beginners guide to all things bitcoin.
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