State and explain the principles of public key cryptography.
Subject Computer and Network Security
NU Year Set: 2.(b) Marks: 5 Year: 2017

 

Principles of Public Key Cryptography

Also called asymmetric cryptography

• Different from secret key cryptography, algorithms for encoding and decoding differ considerably

• Working with two keys                     

→ A private key d (known only to the owner)

→ A public key e (known by possibly everyone)

• Public key cryptography principle (e.g. RSA): plaintext cipher text plaintext cipher text encryption decryption public key e private key d

 • More easily configurable than secret key cryptography, but slower

• Often combined with secret key: authentication and distribution of a secret key (e.g. Diffie-Hellman for establishment of a shared secret)

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