'64 bit data blocks' diaporamas de présentation

CMSC 426/626 Notes

CMSC 426/626 Notes. Krishna M. Sivalingam UMBC krishna@umbc.edu. Based on: Cryptography and Network Security. Third Edition by William Stallings Lecture slides by Lawrie Brown. Key Management. public-key encryption helps address key distribution problems have two aspects of this:

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Cryptography and Network Security (CS435)

Cryptography and Network Security (CS435). Part Three (Modern Symmetric Ciphers). Block vs Stream Ciphers. block ciphers process messages in blocks, each of which is then en/decrypted like a substitution on very big characters 64-bits or more

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Cryptography and Network Security

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Lecture 1: Cryptography for Network Security

Lecture 1: Cryptography for Network Security. Anish Arora CSE5473 Introduction to Network Security. Symmetric encryption. Symmetric encryption requirements. two requirements for secure use of symmetric encryption: a strong encryption algorithm a secret key known only to sender / receiver

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Infromation Security

Infromation Security. Depart. of Computer Science and Engineering ???( Liu Shengli) Tel: 62932135 Email: liu-sl@cs.sjtu.edu.cn. Block Ciphers and DES, AES. ???( Liu Shengli) Tel: 62932135 Email: liu-sl@cs.sjtu.edu.cn. Block vs Stream Ciphers.

578 views • 46 slides

Cryptography and Network Security Chapter 3

Cryptography and Network Security Chapter 3. Modern Block Ciphers. now look at modern block ciphers one of the most widely used types of cryptographic algorithms provide secrecy /authentication services focus on DES (Data Encryption Standard) to illustrate block cipher design principles.

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Symmetric Encryption Algorithms

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Symmetric Encryption Algorithms

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Symmetric Encryption Algorithms

Symmetric Encryption Algorithms. Symmetric Cipher Model. Plaintext Encryption Algorithm Secret Key (known to sender and receiver) Ciphertext Decryption Algorithm. Secret Key. Secret Key. Plaintext Message. Encryption Algorithm. Decryption Algorithm. Plaintext Message.

488 views • 40 slides

Modern Block Ciphers- DES (based on slides made by Dr. Lawrie Brown)

Modern Block Ciphers- DES (based on slides made by Dr. Lawrie Brown). now look at modern block ciphers one of the most widely used types of cryptographic algorithms Provide confidentiality services We discuss in detail DES (Data Encryption Standard) and AES (Advanced Encryption Standard)

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