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Key Objectives in COMPUTER SECURITY, Authentication, VPN, Crypotology,…

- - - - Uses Oneway Functions
        
        Factoring integers (2^16)
        Example - [Diffie-Hellman, Elgamal, DSA]
        
        Diffie-Hellman used in SSH, TLS, IPSec
        
        Elliptic Curves
        Example - [ECDH, ECDSA]
        
        Discrete Logarithm (5*9)
        Example - [RSA]
        
        RSA Used toTransport Keys & Digital signatures
  - - - Strong Algo has,
        
        Confusion - No relationship between key & cipher text (archive using substitution)
        
        Diffusion - 1 change can change entire cipher text
        (archive using bit permutation)
      - Product Ciphers - go through many Confusion and Diffusion Rounds
      - Types -
        DES [DES,3DES]
        AES(world standard for block encryption)
        IDEA
        RC [RC1 RC2 RC4 RC5 RC6]l
    - - Encrypt and Decrypt using XOR gate
- - - - ACL Best Pracices
        Stealth Rule on Top
        Deny Rule at Bottom
        Define both Inbound and Outbound
        Reject,
        Internal Packest with external IP
        External Packest with Internal IP
- - - - Limitations
        Cannot,
        keep track of sessions
        prevent IP Spoofing attacks
        allow dynamic port mapping
- - - - automatically detect and identify issues
      - Analysis Techniques
        
        known attacks
        
        Machine Learning
    - - Block access
      - Terminate connection