'Plaintext block' presentation slideshows

Cipher Techniques

Cipher Techniques. Chapter 12. 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) Secure Socket Layer (SSL) Security at the Network Layer (IPsec).

1.33k views • 129 slides

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)

841 views • 69 slides

Data Security and Cryptology, VIII Other Symmetric Cryptoalgorithms (beyond AES)

Data Security and Cryptology, VIII Other Symmetric Cryptoalgorithms (beyond AES). October 24th , 2012 Valdo Praust mois @ mois .ee Lecture Course in Estonian IT College Autumn 2012. Main Types of Cryptoalgorithms.

766 views • 68 slides

CS/ECE 478 Dr. Attila Altay Yavuz

CS/ECE 478 Dr. Attila Altay Yavuz. Symmetric Crypto Credit: Prof. Dr. Peng Ning for slides. plaintext. ciphertext. plaintext. Encryption. Decryption. key. Secret Key (Symmetric) Cryptography. Same key is used for both encryption and decryption

564 views • 56 slides

562 views • 56 slides

Cryptography and Network Security Chapter 6

548 views • 54 slides

Chapter 6

Chapter 6. More on Symmetric Ciphers. Contents. Multiple Encryption and Triple DES Block Cipher Modes of Operation Stream Ciphers and RC4. Multiple Encryption and Triple DES. Multiple Encryption and Triple DES Double DES Triple DES with Two Keys Triple DES with Three Keys.

431 views • 43 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

Chapter 9

Chapter 9. Public Key Cryptography and RSA. Misconceptions Concerning Public-Key Encryption. Public-key encryption is more secure from cryptanalysis than symmetric encryption Public-key encryption is a general-purpose technique that has made symmetric encryption obsolete

658 views • 38 slides

Modes of Operation

Modes of Operation. Topics. Overview of Modes of Operation EBC, CBC, CFB, OFB, CTR Notes and Remarks on each modes. Modes of Operation. Block ciphers encrypt fixed size blocks eg. DES encrypts 64-bit blocks, with 56-bit key

702 views • 38 slides

Cryptography and Network Security Chapter 6

509 views • 30 slides

Multiple Encryption & DES

311 views • 30 slides

CPSC 3730 Cryptography

CPSC 3730 Cryptography. Chapter 6 Triple DES, Block Cipher Modes of Operation. Triple-DES. although are no practical attacks on two-key Triple-DES have some indications can use Triple-DES with Three-Keys to avoid even these C = E K3 (D K2 (E K1 (P)))

411 views • 23 slides

Block Cipher Operation

Block Cipher 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/cse571-11/. Overview. Double DES, Triple DES, DES-X Encryption Modes for long messages:

820 views • 23 slides

Dr. Kemal Akkaya E-mail: kemal@cs.siu

419 views • 22 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