'Cipher block chaining' presentation slideshows

Computer Networks

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Chapter 10: Cipher Techniques

Chapter 10: Cipher Techniques. Some Problems Types of Ciphers Networks Examples. Overview. Problems What can go wrong if you naively use ciphers Cipher types Stream or block ciphers? Networks Link vs end-to-end use Examples Privacy-Enhanced Electronic Mail (PEM)

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What Mother Never Told You about Cryptography

What Mother Never Told You about Cryptography. Don Stoever Product Development CSI International. Cryptography Fundamentals. Cryptography is the key building block for many other security services Without it: No privacy No authentication No integrity. Cryptography Fundamentals.

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Symmetric cryptography

Symmetric cryptography. (Slides by Jaap-Henk Hoepman & Jeroen Doumen). Contents. Basics History Ciphers Attacks Hashing. Cryptology goals. Confidentiality Data integrity Authentication Non-repudiation. Cryptology. Cryptography The art of making Cryptanalysis The art of breaking.

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Chapter 4 Modes of Operation

Chapter 4 Modes of Operation. Instructor: ??? hmsun@cs.nthu.edu.tw Room: EECS 6402, Tel:03-5742968, Fax : 886-3-572-3694. Encrypting a Large Message. There are several schemes defined in [DES81] to encrypt a message larger than 64 bits. Electronic Code Book (ECB) Cipher Block Chaining (CBC)

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Network Security

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Lecture 21 Network Security

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Electronic Payment Systems 20-763 Lecture 5 Epayment Security I

Electronic Payment Systems 20-763 Lecture 5 Epayment Security I. Cryptography. Message digest (hash) algorithms Secure Hash Algorithm Defending against attacks Salting, nonces Symmetric encryption DES and variations AES: Rijndael Public-key algorithms RSA. One-Way Hash Functions.

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Modes of Operation

Modes of Operation. Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at : http://www.cse.wustl.edu/~jain/cse571-09/. Overview. Modes of Operation: ECB, CBC, OFB, CFB, CTR Privacy+Integrity

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Chapter 20

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CIS 5371 Cryptography

CIS 5371 Cryptography. 3c. Pseudorandom Functions B ased on: Jonathan Katz and Yehuda Lindell Introduction to Modern Cryptography. Definition. Definition 3.23. Let F be an efficient length preserving keyed function. F is a pseudorandom function if

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Block Cipher

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Practical Aspects of Modern Cryptography

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Chapter 4-1 Cipher Operating Modes

Chapter 4-1 Cipher Operating Modes. Block ciphers, like DES, encrypt plaintext in fixed size, n-bit blocks. (n is typically 64) For messages longer than 64 bits, the easiest method is to divide the message in n-bit blocks and encrypt each block separately. This is

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Stream Ciphers and Block Ciphers

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Encrypting & Authenticating with Block Ciphers

Encrypting & Authenticating with Block Ciphers. CS 519 Cryptography and Network Security Instructor: Ali Aydin Selcuk. How to Encrypt with a Block Cipher?. Electronic Codebook (ECB) Mode: The naive way.

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Telecommunication project 2006

Telecommunication project 2006. The Cipher Modes. The Cipher Modes. Some definitions. - Initialization vector: it is a random data bloc which allows starting the encryption of the first bloc. Thus, it gives to the subject a kind of independent fortune.

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Agenda

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Modes of Operation

Modes of Operation. CS 795. Electronic Code Book (ECB). Each block of the message is encrypted with the same secret key Problems: If two identical blocks are in the same message, cipher text would be identical. Cipher blocks can be rearranged to alter the message. Cipher Block Chaining (CBC).

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