Section 2: Cryptography

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Presentation transcript:

Section 2: Cryptography Network Security Section 2: Cryptography

2 Cryptography Rules huh!? Right Order! Redundancy What is the solution? Redundancy Cipher text should contain redundancies data Example: Fired Employee! The Couch Potato! huh!? Right Order!

2 Cryptography Rules Valid for 10 sec Freshness Ensure the freshness of every message. Example: Again Fired Employee! Timestamp Valid for 10 sec ----------------------------------------------------------------

Symmetric-Key Algorithms Use one key for encryptions and decryption Has both Hardware and software implementation

Data Encryption Standard (DES) DES Main Function Extend 32 bit to 48 bit XOR E with Ki Send 8 groups to S-box Send to P-Box DES Whitening Generate random key

Triple DES To short DES key length Why 2 keys? Why EDE instead of EEE? Easy transportation Compatibility with pervious version

Example of DES