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Symmetric Key and Public Key Encryption
 
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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: 449105 itfreetraining
Excel - Encryption using Excel      ( Great Trick )
 
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Many more great Excel tutorials linked below: http://www.youtube.com/playlist?list=PL8004DC1D703D348C&feature=plcp Be sure to watch my other Excel tutorial videos on my channel, including more advanced techniques and many useful and practical ones. Be sure to Subscribe and Comment.
Views: 29203 Jalayer Academy
Public Key Cryptography: RSA Encryption Algorithm
 
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RSA Public Key Encryption Algorithm (cryptography). How & why it works. Introduces Euler's Theorem, Euler's Phi function, prime factorization, modular exponentiation & time complexity. Link to factoring graph: http://www.khanacademy.org/labs/explorations/time-complexity
Views: 531983 Art of the Problem
Enigma II Encryption Machine & Puzzle - encode & decode cipher
 
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AVAILABLE AT http://www.creativecrafthouse.com/index.php?main_page=product_info&cPath=137&products_id=964 This is an encryption machine that will allow you to encrypt your own messages and in addition we have provided 8 secret messages for you to try and solve. Send and receive secret messages to anyone who has a machine. its quite easy to use but creates messages that can be extremely complex to decode. Hardwood construction with gears cut from ¼” thick wood. All letters and text are deeply laser engraved into the wood. The gears turn on alloy steel pins. Made in USA and designed to last a lifetime. Available in 2 different sizes. The larger one measures approx. 12.75” x 4.5” x 1”. Each gear is approx. 3.75” in diameter . The smaller size measures 9.4” x3.2” x 1”. Each gear is approx. 3.75” in diameter) Avail at CreativeCrafthouse.com We have also recently done the Confederate Army Cipher, the Union Army Cipher (used for flag signaling) and th Mexican Army Cipher
Views: 43542 dj51florida
05  Encryption 91371
 
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A very basic description of encoding in general with a quick look on some encryption specifics. Focus on the Caesar cipher and how it could be broken.
Views: 66 nzdzeni
How to encrypt and decrypt passwords using Cipher Algorithm and how it works? BDSide
 
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a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is encipherment. To encipher or encode is to convert information into cipher or code. In common parlance, "cipher" is synonymous with "code", as they are both a set of steps that encrypt a message; however, the concepts are distinct in cryptography, especially classical cryptography. To get the full source code: http://www.bdside.com/tutorials/how-to-encrypt-and-decrypt-passwords-in-android.html
Views: 37 BDSide
Substitution Ciphers
 
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A brief demonstration of how to use frequency analysis on the following page to decrypt messages enciphered using a substitution cipher: http://www.advanced-ict.info/interactive/substitution.html
Cryptography: Transposition Cipher
 
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This lesson explains how to encrypt and decrypt a message using a transposition cipher. Site: http://mathispower4u.com
Views: 56675 Mathispower4u
C# encrypting and decrypting using AES CBC, safe storing the encrypted data
 
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In this tutorial i'm going to show you how to encrypt, decrypt data using AES(Advanced Encryption Standard), and storing the encrypted data in safe place. Source code: https://drive.google.com/file/d/0BxW01l6w6JYfd1pTZVBjaWxhWEU/view?usp=sharing
Views: 56377 Dawisko1
Caeser and Keyless Transposition Cipher
 
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Computer data and Network Security
Views: 720 Mohamad Khirdaffi
Encryption
 
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A video that explains the basic principles of Encryption including different types of Encryption e.g. Ceaser Cipher, transposition encryption, Vernam Cipher
Views: 1402 Comp Franklin
English Frequecny Analysis Decryption - AlphaPeeler
 
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AlphaPeeler Professional - Standard English alphabet frequecny analys decryption (ETAOINS..), using crypto keyboard
Views: 216 AlphaPeeler
Affine Cipher Encryption
 
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gcd: https://www.youtube.com/watch?feature=player_detailpage&v=WA4nP-iPYKE Decryption: http://youtu.be/XFxFPBKFVe8
Views: 22237 Theoretically
Authentication of the Key Exchange
 
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This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459
Views: 207 Udacity
Hill Cipher Encryption Technique - Matlab Simulation Tutorial 2017
 
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Hill Cipher Encryption Technique - Matlab Simulation 2017 For more examples check http://onlineengineers.info The Hill cipher is an example of a block cipher. A block cipher is a cipher in which groups of letters are enciphered together in equal length blocks. The Hill cipher was developed by Lester Hill and introduced in an article published in 1929. Encipher In order to encrypt a message using the Hill cipher, the sender and receiver must first agree upon a key matrix A of size n x n. A must be invertible mod 26. The plaintext will then be enciphered in blocks of size n. In the following example A is a 2 x 2 matrix and the message will be enciphered in blocks of 2 characters. https://en.wikipedia.org/wiki/Hill_cipher
Views: 2739 Uniformedia
Overview on Modern Cryptography
 
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Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 34984 nptelhrd
The Mix-and-Cut Shuffle: Small-Domain Encryption Secure  ...
 
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Talk at crypto 2013. Authors: Thomas Ristenpart, Scott Yilek
Views: 265 TheIACR
Basic Cryptography - PentBox
 
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We are using PentBox so do some basic hashing, encoding, and decoding with the top five hashing algorithms. We are also using a password generator based on a keyword.
Views: 139 The Linux Talks
FEAL
 
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FEAL In cryptography, FEAL (the Fast data Encipherment ALgorithm) is a block cipher proposed as an alternative to the Data Encryption Standard (DES), and designed to be much faster in software.The Feistel based algorithm was first published in 1987 by Akihiro Shimizu and Shoji Miyaguchi from NTT. =======Image-Copyright-Info======= Image is in public domainImage Source: https://en.wikipedia.org/wiki/File:FEAL_InfoBox_Diagram.png =======Image-Copyright-Info======== -Video is targeted to blind users Attribution: Article text available under CC-BY-SA image source in video https://www.youtube.com/watch?v=wCONLYZyOdQ
Views: 242 WikiAudio
Encoding and Decoding Using Matrices
 
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Had a sore throat! Better to play this at a faster speed if you can!! This video teaches you how to encode and decode a matrix with the aid of your graphing calculator.
Views: 56871 Mr. Dan Muscarella
How asymmetric (public key) encryption works
 
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Easy explanation of "public key encryption". Instead of the usual terms of "public key" and "private key" this tutorial uses "lock" and "key". ================================================== If you want to start protecting you email: get free Privacy Everywhere Beta, http://www.privacyeverywhere.net/
Views: 202028 Veet Vivarto
Send Secret Messages with Encipher.it
 
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I show how to send secret encrypted messages with Encipher.it. Encipher.it: https://encipher.it/ Send Secret Messages with Encipher.it Encipher.it is a great tool that allows you to encrypt messages and information straight from your browser to be sent via email or however you like.
Views: 7904 Austin Evans
CRYPTOGRAPHY | Secret Language  | CODING AND DECODING
 
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CRYPTOGRAPHY | Secret Language | CODING AND DECODING When you were a kid, did you have a "Captain Midnight" decoder ring? With it, you could send messages to a friends that no one else could read. Or perhaps you remember using special symbols to write notes to your "squeeze" in class. If the note was intercepted , your teacher, could learn nothing about your romance. In more serious uses, codes and ciphers are used by our military and diplomatic forces to keep confidential information from unauthorized eyes. Businesses also send data that has been encoded to try and protect trade secrets and back-room deals. After all, you wouldn't want your competitor to know that you were about to acquire their company with a leveraged buy-out. The study of enciphering and encoding (on the sending end), and deciphering and decoding (on the receiving end) is called cryptography from the Greek κρυπτός (kryptos), or hidden and γράφειν (graphia), or writing. If you don't know Greek (and not many of us do) the above letters could be a form of code themselves! Although the distinction is fuzzy, ciphers are different from codes. When you substitute one word for another word or sentence, like using a foreign language dictionary, you are using a code. When you mix up or substitute existing letters, you are using a cipher. (I told you the difference was fuzzy, and you can combine codes and ciphers by substituting one word for another and then mixing up the result.) We'll concentrate on ciphers. For a cipher to be useful, several things must be known at both the sending and receiving ends. The algorithm or method used to encipher the original message (known as the plaintext). The key used with the algorithm to allow the plaintext to be both enciphered and deciphered. The period or time during which the key is valid. By way of analogy, to get into your home you would put a key in a lock to open the door. This process (the use of a key and a lock) is the method or algorithm. Now this method only works if you have the proper key to stick in the lock, and your key will be valid only as long as you are the resident of the particular abode. The next resident will have the locks changed to a different key to make sure that you cannot enter even though you may know the method. The selection of the above three items - algorithm, key and period - depend on your needs. If you are in the battlefield and are receiving current tactical data, you want an algorithm that makes it easy to decipher the message in the heat of battle. On the other hand, you must also assume that your opponent has intercepted your enciphered message and is busy trying to break it. Therefore you must choose an algorithm (method) that is complicated enough so that by the time your opponent figures it out, the data will be worthless. The easier the algorithm you choose, the more often you will have to change the key that unlocks the code - if you want to keep your enemy in the dark. Ciphers are broken into two main categories; substitution ciphers and transposition ciphers. Substitution ciphers replace letters in the plaintext with other letters or symbols, keeping the order in which the symbols fall the same. Transposition ciphers keep all of the original letters intact, but mix up their order. The resulting text of either enciphering method is called the ciphertext. Of course, you can use both methods, one after the other, to further confuse an unintended receiver as well. To get a feel for these methods, let's take a look at some ciphers. Substitution ciphers and decoder rings We use substitution ciphers all the time. (Actually, substitution ciphers could properly be called codes in most cases.) Morse code, shorthand, semaphore, and the ASCII code with which these characters are being stored in inside my Macintosh are all examples. (ASCII stands for American Standard Code for Information Interchange, just in case you're interested.) The only difference between these and the spy codes is that the above examples are standardized so that everyb
How Do Digital Signatures Work?
 
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In this video, I will be showing you how digital signatures are generated and how they help in establishing non-repudiation.
Views: 173163 Fasih Khatib
Substitution Cipher Encryption - AlphaPeeler
 
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AlphaPeeler Professional - Substitution Cipher Encryption
Views: 521 AlphaPeeler
Playfair Cipher Encryption / Decryption - AlphaPeeler
 
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AlphaPeeler Professional - Playfair cipher encryption and decryption
Views: 3474 AlphaPeeler
Cipher Text [CMD TRICKS -1] TAMIL
 
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#VSV-TAMIL In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is encipherment. To encipher or encode is to convert information into cipher or code. In common parlance, "cipher" is synonymous with "code," as they are both a set of steps that encrypt a message; however, the concepts are distinct in cryptography, especially classical cryptography. Codes operated by substituting according to a large codebook which linked a random string of characters or numbers to a word or phrase. For example, "UQJHSE" could be the code for "Proceed to the following coordinates." When using a cipher the original information is known as plaintext, and the encrypted form as ciphertext. The ciphertext message contains all the information of the plaintext message, but is not in a format readable by a human or computer without the proper mechanism to decrypt it. The operation of a cipher usually depends on a piece of auxiliary information, called a key (or, in traditional NSA parlance, a cryptovariable). The encrypting procedure is varied depending on the key, which changes the detailed operation of the algorithm. A key must be selected before using a cipher to encrypt a message. Without knowledge of the key, it should be extremely difficult, if not impossible, to decrypt the resulting ciphertext into readable plaintext.
Views: 80 VSV-TAMIL
ConFidence 2010 - The Data Encryption Standard (DES) . How broken is it?
 
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This video is part of the Infosec Video Collection at SecurityTube.net: http://www.securitytube.net ConFidence 2010 - The Data Encryption Standard (DES) . How broken is it? This talk will cover the history of DES, the different attacks on it that have come out over the years, and the newest developments of my research into breaking it. I will also cover the implementation and optimizations of building the fastest public DES cracker in the world, a single 4U system which can perform close to a trillion DES operations per second (almost 10 times faster than EFF.s DeepCrack). Some of the implications of Moore.s law approaching the feasibility to break DES in real-time will be explored. Is unix crypt(3) still secure? Can rainbow tables for DES be built? Can systems like this attack any sort of DES encrypted data? What does this mean for other .secure. algorithms 40 years from now? Many of these questions will be explored and answered.
Views: 1079 SecurityTubeCons
Churn Algorithm Demonstration
 
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Demonstration of the Churn Algorithm at work cracking a monoalphabetic substitution cipher. The Project is named differently because the Churn Algorithm was converted from the Hillclimbing algorithm.
Views: 658 eliotball
Security+ Digital Signatures
 
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Security+ cryptography topic. How digital signatures are created.
Views: 51521 Darril Gibson
Encipher.it Demonstration
 
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Read more: http://lifehacker.com/5814244/encipherit-encrypts-text-with-a-bookmarklet-and-a-password-for-extra-sensitive-emails
Views: 19382 Lifehacker
Typo3 Encryption Key Attack
 
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This short screen capture demonstrates the use of the Typo3 Encryption Key tool found on www.c22.cc. This tool exploits the weak encryption key found in versions 4.2.3 and earlier of Typo3 (see Typo3-sa-2009-001 / Insecure Randomness vulnerability). http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-001/
Views: 4198 Chris John
Affine Cipher Decryption - Known Key
 
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This video is the second Affine Cipher video. Decryption when the key is known. How to find multiplicative inverse (x^-1 mod n): https://www.youtube.com/watch?v=K5nbGbN5Trs Encryption: http://youtu.be/_E8rSP0uAIY
Views: 21079 Theoretically
On the Security of TLS-DHE in the Standard Model
 
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Talk at crypto 2012. Authors: Tibor Jager, Florian Kohlar, Sven Schäge, Jörg Schwenk. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=24293
Views: 481 TheIACR
3 (Digital Certificate) How to Check for Digital Certificate in system (Class 2)
 
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7 (Application) How to Check for Digital Certificate in system (Class 2) Video Link - https://www.youtube.com/watch?v=XX7_EhH6tKs Solution - It is well known that income tax returns can be now signed digitally ... as a director of a company also , class 2 digital certificates have become mandatory But how many people understand how to use a digital certificate ...and that is where this tutorial will come in handy We see how user must first use system setting's to see whether the certificates reflect the DSC certificate user name For that we need to first insert the token ...then we need to open Internet explorer and then go to tools ----Internet Options ----Content ----Certificates Here one can see the name of the person to whom the certificate has been used One then needs to load the secure sign software to make use of the digital key certificate Once secure sign is installed , we can then import any document to which we would be wanting to attach a signature ! We do the entire thing , first we show the digital signatures for our Key (purchased through N code )(Class 2 )...then we inmstall secure sign software Then we take a sample PDF document and apply our signature Voila , that's it This is how you would be checking for Digital signature certificates in your system Please ensure that that you have downloaded the issuing agency drivers compatible to your Operating system. For example , if you have bought the DSC from n Code , then don't forget to install the drivers from n Code ....if you have purchased from TCS , don't forget to download the certificate drivers from TCS etc etc Until you do this , you wont be able to see the certificate in the system and thus put it to use for signing files , returns , documents etc etc Hope this immensely practical Tutorial helps , Let Knowledge be Practical , Peace , Amlan Dutta
Views: 74659 Make Knowledge Free
03 XOR Cipher  Keyword
 
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(3 of 4) Work-through tutorial on creating a cipher system in Excel 2010 using binary XOR.
Views: 1898 Rodborough ICT
Visulise RailFence
 
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how to write to the console in a similar way to the pre-release rail fence grid. (sorry if this was a little confused, I would have re-recorded if I had more time)
Transposition Cipher Encryption / Decryption - AlphaPeeler
 
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AlphaPeeler Professional - Transposition Cipher Encryption Decryption
Views: 1974 AlphaPeeler
Phil Rogaway - IACR Distinguished Lecture 2015
 
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The moral character of cryptographic work. http://web.cs.ucdavis.edu/~rogaway/papers/moral.html Presented at Asiacrypt 2015 in Auckland, New Zealand.
Views: 2814 TheIACR
A simple Cesar Cipher with python
 
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Creating a simple Cesar cipher with python programming
Views: 29735 Rehman Chughtai
Dsc Download By capricorn
 
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Digital Signature Certificate Download Capricorn
Views: 5025 KRISHNA COMPUTERS
04 XOR Cipher  Plaintext and Ciphertext
 
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(4 of 4) Work-through tutorial on creating a cipher system in Excel 2010 using binary XOR.
Views: 7460 Rodborough ICT
transposition netwinz
 
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netwinz TRANSPOSITION CIPHER Introduction: In cryptography, a transposition cipher is method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the cipher text constitutes a permutation of the plaintext. That is, the order of the units is changed. Mathematically a bijective function is used on the characters' positions to encrypt and an inverse function to decrypt. In a columnar transposition, the message is written out in rows of a fixed length, and then read out again column by column, and the columns are chosen in some scrambled order. Both the width of the rows and the permutation of the columns are usually defined by a keyword. For example, the word ZEBRAS is of length 6 (so the rows are of length 6), and the permutation is defined by the alphabetical order of the letters in the keyword. In this case, the order would be "6 3 2 4 1 5". In a regular columnar transposition cipher, any spare spaces are filled with nulls; in an irregular columnar transposition cipher, the spaces are left blank. Finally, the message is read off in columns, in the order specified by the keyword. HOW TO CONDUCT THE EXPERIMENT: Click on Presentation Layer on the Main Window and Then Select "TRANSPOSITION CIPHER" Module from the Modules displayed in the centre of the window. TRANSPOSITION CIPHER Window will open up as shown in SNAPSHOT-1. SNAPSHOT-1 TRANSMITTER: 1. Enter the "IP Address" of the computer to which you intend to send data. 2. Enter the Key for Encryption. The key value is between 5 digits each digit between 1 and 5. The key determines the column order for encryption. 3. Enter the Data that needs to be encrypted in the "TEXT" textbox. 4. Click on "ENCRYPT" button to encrypt the data. The table displays the columnar Cipher Table as shown in SNAPSHOT-2. The Encrypted Data is shown in the "ENCRYTED TEXT" textbox. 5. Click on the "SEND" button to send the encrypted Data to the destination IP. SNAPSHOT-2 Use Loop back Address "127.0.0.1" to send the Data to the same computer. RECEIVER: In the Receiver Window, the Encrypted Data is displayed in the "ENCRYTED TEXT" text box as soon as the data is received as shown in SNAPSHOT-3. SNAPSHOT-3 1. Enter the Key value same as entered on the server in the "KEY" textbox. 2. Click on "DECRYPT" button to decrypt the data. The Decrypted data is shown in the "TEXT" textbox on the receiver as shown in SNAPSHOT-4 And the Transposition Cipher Table is shown in the table at the bottom of the Receiver Window. SNAPSHOT-4 Transmitter and Receiver Messages are Displayed in the "Message Window" on the extreme right. Reset Button: Click On "RESET BUTTON" to reset all the controls to initial values. Click on "HELP BUTTON" to Open TRANSPOSITION CIPHER Manual. Click on "EXIT BUTTON" To Close TRANSPOSITION CIPHER Window. Copyright © 2011 Emblitz Technologies Pvt Ltd. All rights reserved. www.netwinz.com
Views: 1588 Paras Jain
2011 Killian Lecture: Ronald L. Rivest, "The Growth of Cryptography"
 
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Lecture title: "The Growth of Cryptography" Ronald L. Rivest, a professor of electrical engineering and computer science who helped develop one of the world's most widely used Internet security systems, was MIT’s James R. Killian, Jr. Faculty Achievement Award winner for 2010–2011. Rivest, the Andrew and Erna Viterbi professor in MIT's Department of Electrical Engineering and Computer Science, is known for his pioneering work in the field of cryptography, computer, and network security. February 8, 2011 Huntington Hall (10-250)
02 XOR Cipher  Characters and Binary
 
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(2 of 4) Work-through tutorial on creating a cipher system in Excel 2010 using binary XOR.
Views: 2792 Rodborough ICT
Encode and Decode your message in Excel
 
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Hello friends, In this video you will learn how to encode and decode a message in excel by using user define function of VBA. Please download this excel file from below given link: https://drive.google.com/open?id=0B_YGmF63LQbNMFdqLXFhM0s3TFE Watch the best info-graphics and dynamic charts from below link: https://www.youtube.com/playlist?list=PLbDvAYjpWJ7CEAHn-iuGSeLbUtFnYekHr Follow me on Facebook: https://facebook.com/PKAn-Excel-Expert-974812222655234/
Views: 1711 PK: An Excel Expert

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