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Lecture 8: Advanced Encryption Standard (AES) by Christof Paar
 
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For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com. The AES book chapter for this video is also available at the web site (click Sample Chapter).
Decentralizing Attribute-Based Encryption
 
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We present a Multi-Authority Attribute-Based Encryption (ABE) system. In our system, any party can become an authority and there is no requirement for any global coordination other than the creation of an initial set of common reference parameters. A party can simply act as an ABE authority by creating a public key and issuing private keys to different users that reflect their attributes. A user can encrypt data in terms of any boolean formula over attributes issued from any chosen set of authorities. Finally, our system does not require any central authority. In this talk, I will present our system and discuss its proof, which employs dual system encryption techniques. Our system uses bilinear groups of composite order, and we prove security under static assumptions in the random oracle model. This is joint work with Brent Waters.
Views: 1331 Microsoft Research
Caesar Cipher
 
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This tutorial will teach you how to encrypt and decrypt messages using the Caesar Cipher.-- Created using PowToon -- Free sign up at http://www.powtoon.com/ . Make your own animated videos and animated presentations for free. PowToon is a free tool that allows you to develop cool animated clips and animated presentations for your website, office meeting, sales pitch, nonprofit fundraiser, product launch, video resume, or anything else you could use an animated explainer video. PowToon's animation templates help you create animated presentations and animated explainer videos from scratch. Anyone can produce awesome animations quickly with PowToon, without the cost or hassle other professional animation services require.
Views: 115451 Lacey Wright
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: 52926 Mr. Dan Muscarella
substitution ciphers
 
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substituation ciphers polygraphic ciphers polyalphabetic ciphers example of each case....... submitted as a part of class activity at Christ University Computer Science Department MCA- 3rd sem for the paper Computer Networks
Views: 34543 valent pawar
introduction to practical cryptography
 
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Subscribe today and give the gift of knowledge to yourself or a friend introduction to practical cryptography Introduction to Practical Cryptography. Lectures 3/4 Stream Ciphers. Agenda. Properties Building Blocks Competitions Examples. Uses. Encryption of streaming data Random bit generation. Stream Ciphers. Stream cipher outputs keystream, KS Slideshow 3093083 by kermit show1 : Introduction to practical cryptography show2 : Agenda show3 : Introduction to practical cryptography show4 : Stream ciphers show5 : Stream ciphers1 show6 : Stream ciphers2 show7 : Stream ciphers general concept show8 : Stream ciphers general concept1 show9 : Keystream properties show10 : Agenda1 show11 : Stream ciphers approaches show12 : Feedback shift register show13 : Feedback shift registers show14 : Variations utilizing lfsr show15 : Variations utilizing lfsr1 show16 : Clock control examples show17 : Clock control examples1 show18 : Agenda2 show19 : Nessie stream cipher submissions show20 : Ecrypt s estream contest show21 : Estream overview show22 : Estream evaluation show23 : Estream phase 3 candidates show24 : Estream winners show25 : Agenda3 show26 : Stream cipher examples show27 : Introduction to practical cryptography show28 : Introduction to practical cryptography show29 : Introduction to practical cryptography show30 : Introduction to practical cryptography show31 : A5 1 lsrfs
Views: 30 slideshow this
Cryptographic Problems in Algebraic Geometry Lecture
 
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AGNES is a series of weekend workshops in algebraic geometry. One of our goals is to introduce graduate students to a broad spectrum of current research in algebraic geometry. AGNES is held twice a year at participating universities in the Northeast. Lecture presented by Kristin Lauter.
Views: 1509 Brown University
Chapter 01
 
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Video presentation by: Teacher and Researcher Todd Booth Book Title: Network Security Essentials: Applications and Standards (6th Edition) Author: William Stallings Publisher: Pearson; 6th edition (August 7, 2016) Language: English ISBN-10: 013452733X ISBN-13: 978-0134527338 For 35% off the price, please order via the author William Stallings web page: http://williamstallings.com/NetworkSecurity/ From the author’s web page, you can get the coupon code at this web page: http://williamstallings.com/DiscountBookPurchase/
Views: 3116 Todd Booth
Compact Proofs of Retrievability
 
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In a proof-of-retrievability system, a data storage center must prove to a verifier that he is actually storing all of a client's data. The central challenge is to build systems that are both efficient and provably secure -- that is, it should be possible to extract the client's data from any prover that passes a verification check. We present the first proof-of-retrievability schemes with full proofs of security against arbitrary adversaries in the strongest model, that of Juels and Kaliski. Our first scheme, built from BLS signatures and secure in the random oracle model, has the shortest query and response of any proof-of-retrievability with public verifiability. Our second scheme, which builds elegantly on pseudorandom functions (PRFs) and is secure in the standard model, has the shortest response of any proof-of-retrievability scheme with private verifiability (but a longer query). Both schemes rely on homomorphic properties to aggregate a proof into one small authenticator value. Joint work with Brent Waters (UT Austin).
Views: 343 Microsoft Research
Forward Secure Asynchronous Messaging from Puncturable Encryption
 
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Forward Secure Asynchronous Messaging from Puncturable Encryption Ian Miers Presented at the 2015 IEEE Symposium on Security & Privacy May 18--20, 2015 San Jose, CA http://www.ieee-security.org/TC/SP2015/ ABSTRACT In this paper we investigate new mechanisms for achieving forward secure encryption in store and forward messaging systems such as email and SMS. In a forward secure encryption scheme, a user periodically updates her secret key so that past messages remain confidential in the event that her key is compromised. A primary contribution of our work is to introduce a new form of encryption that we name puncturable encryption. Using a puncturable encryption scheme, recipients may repeatedly update their decryption keys to revoke decryption capability for selected messages, recipients or time periods. Most importantly, this update process does not require the recipients to communicate with or distribute new key material to senders. We show how to combine puncturable encryption with the forward-secure public key encryption proposal of Canetti et al. To achieve practical forward-secure messaging with low overhead. We implement our schemes and provide experimental evidence that the new constructions are practical.
A Competitive Study of Cryptography Techniques over Block Cipher
 
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A Competitive Study of Cryptography Techniques over Block Cipher, Contact Srujana Technologies
Homomorphic Signatures with Efficient Verification for Polynomial Functions
 
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Homomorphic Signatures with Efficient Verification for Polynomial Functions by Dario Catalano, Bogdan Warinschi, Dario Fiore. Talk at Crypto 2014.
Views: 397 TheIACR
Chao's Projective Mapping Project
 
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This a class project in Computer Graphics Algorithms. If you want to know more about the project, please go to the link below http://mosunchao.com/projective-mapping/ converted video form .MOV to .AVI using Pazera Converter extract frames using Irfanview Language: Java IDE: Eclipse Matrix Library: Jama Algorithms used: Inferring Projective Mappings Reverse Mapping Bilinear Interpolation
Views: 269 mosunchao
AES s box using verilog coding
 
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Identity-Based Secure Distributed Data Storage Schemes
 
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To get this project in ONLINE or through TRAINING Sessions, Contact: JP INFOTECH, 45, KAMARAJ SALAI, THATTANCHAVADY, PUDUCHERRY-9 Landmark: Opposite to Thattanchavady Industrial Estate, Next to VVP Nagar Arch. Mobile: (0) 9952649690 , Email: [email protected], web: www.jpinfotech.org Blog: www.jpinfotech.blogspot.com Our Branches in: Coimbatore | Salem | Bangalore | Mysore | Tanjore | Cuddalore | Villupuram | Chennai Identity-Based Secure Distributed Data Storage Schemes Secure distributed data storage can shift the burden of maintaining a large number of files from the owner to proxy servers. Proxy servers can convert encrypted files for the owner to encrypted files for the receiver without the necessity of knowing the content of the original files. In practice, the original files will be removed by the owner for the sake of space efficiency. Hence, the issues on confidentiality and integrity of the outsourced data must be addressed carefully. In this paper, we propose two identity-based secure distributed data storage (IBSDDS) schemes. Our schemes can capture the following properties: (1) The file owner can decide the access permission independently without the help of the private key generator (PKG); (2) For one query, a receiver can only access one file, instead of all files of the owner; (3) Our schemes are secure against the collusion attacks, namely even if the receiver can compromise the proxy servers, he cannot obtain the owner's secret key. Although the first scheme is only secure against the chosen plaintext attacks (CPA), the second scheme is secure against the chosen cipher text attacks (CCA). To the best of our knowledge, it is the first IBSDDS schemes where an access permissions is made by the owner for an exact file and collusion attacks can be protected in the standard model.
Views: 380 jpinfotechprojects
Visual Basic Tutorial: How to Encrypt and Decrypt Data
 
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download code: http://www.krob636.com/codesamples/xor.zip This video shows how you can make a simple 'encryption' and 'decryption' program by shifting the ASCII codes. This scrambles the text, making it unreadable for people who were not meant to see it. Note: This encryption may be all you need to conceal your information within your text; however, it can be decoded by performing frequency analysis on your cipher-text (encrypted text). Frequency analysis relies on a cipher failing to hide the fact that certain characters of the alphabet appear more often than others. Following this tutorial, I will be making a tutorial on stronger encryption schemes.
Views: 35794 KRob314to636
Identity-Based Aggregate and Multi-Signature Schemes Based on RSA.
 
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Talk at pkc 2010. Authors: Stanislaw Jarecki, Ali Bagherzandi. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=23402
Views: 471 TheIACR
How to Create a List of All Encrypted Files on All Local Drives in Windows
 
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How to Create a List of All Encrypted Files on All Local Drives in Windows How to Create a List of All Encrypted Files on All Local Drives in Windows How to Create a List of All Encrypted Files on All Local Drives in Windows http://youtu.be/4XChTswztU0 How to Create a List of All Encrypted Files on All Local Drives in Windows Here's How: 1. Open a command prompt in Vista, Windows 7, or Windows 8, and do step 2 or 3 below for what you would like to do. 2. To Use the cipher /u /h Command NOTE: This option is used to find all the encrypted files on the local drives, and will update the user's file encryption key or recovery keys of the encrypted files to use the current keys if changed since encrypted. - In the command prompt, copy and paste the command below, press Enter, and go to step 4 below. 3. To Use the cipher /u /n /h Command NOTE: This option is used to find all the encrypted files on the local drives, and will not update the encyption keys. - In the command prompt, copy and paste the command below, press Enter, and go to step 4 below. 4. When finished, close the command prompt. 5. You will now have a Encrypted-Files.txt file on your desktop with a list of all encrypted files on your system. That's it, Shawn How to Create a List of All Encrypted Files on All Local Drives in Windows
Views: 31 Info Kita