'Cipher block' presentation slideshows

Computer Networks

1.56k views • 136 slides

1.15k views • 101 slides

Network Security

967 views • 90 slides

ECE 4450:427/527 - Computer Networks Spring 2014

751 views • 62 slides

627 views • 52 slides

Computer Security Basic Crypto

Computer Security Basic Crypto. Introduction. Cryptosystem: ( E,D,M,K,C) M is the set of plaintexts K the set of keys C the set of ciphertexts E: M ? K ? C the set of enciphering functions

631 views • 49 slides

Symmetric Cryptography

CS461/ECE422 Spring 2012. Symmetric Cryptography. Outline. Commercial Symmetric systems DES AES Modes of block and stream ciphers. Reading. Chapters 2 and 20 from text. AES Standard issued as FIPS PUB 197 http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf

595 views • 42 slides

Network Security Essentials

Network Security Essentials. Fifth Edition by William Stallings. Chapter 2. Symmetric Encryption and Message Confidentiality.

580 views • 38 slides

Lecture 21 Network Security

469 views • 38 slides

IPsec

IPsec. IPsec (IP security) Security for transmission over IP networks The Internet Internal corporate IP networks IP packets sent over public switched data networks (PSDN). Local Network. Local Network. Internet. IPsec. Why do we need IPsec? IP has no security

829 views • 32 slides

Security in Wireless Local Area Networks

671 views • 28 slides

Monitor's Secret Key Crypto - KARN, encrypt

Monitor's Secret Key Crypto - KARN, encrypt. 512 bit Secret. Monitor's Secret Key Crypto - KARN, encrypt. 512 bit Secret. Left key. Right key. Monitor's Secret Key Crypto - KARN, encrypt. 512 bit Secret. Left key. Right key. 42. First: send out "guard byte" - the number 42 (00101010).

261 views • 17 slides

Modes of operation: many time key (CBC)

Online Cryptography Course Dan Boneh. Using block ciphers. Modes of operation: many time key (CBC). Example applications : 1. File systems: Same AES key used to encrypt many files. 2. IPsec : Same AES key used to encrypt many packets.

212 views • 10 slides

File System and Full Volume Encryption

File System and Full Volume Encryption. Sachin Patel CSE 590TU 3/9/2006. Encrypting File System. Protects sensitive data on computers and laptops from physical theft. Encryption at a lower level that all applications can use. EFS introduced in Windows 2000 Tied to the NTFS file system

286 views • 7 slides

Hybrid Cipher

Hybrid Cipher. Key. IV. Key. Hybrid Cipher. Plain. Cipher. Hybrid Cipher. Plain. Text. Text. Text. decryption. encryption. Note : IV used in encryption is not used in decryption. Features. Initialization Vector (IV) necessary only in Encryption Hash Integration

363 views • 7 slides