Cryptography

Is Algorithm Secret?

Some Simple Ciphers

Breaking a Cipher Scheme

Secret Key Cryptography

Asymmetric Key Cryptography

Encrypting a Large Message

Threats on ECB

CBC Mode of Encryption

CBC Mode of Decryption

Threats on CBC Operation

PKI

Security Mechanism

Security Mechanism: Confidentiality

Security Mechanism: Integrity

Authentication: Symmetric Cipher Based

Owner Integrity: PKI

Authentication: PKI