Cryptographic Systems

Cryptographic Systems

1. History of Cryptography

   • Scytale: Earliest cryptography method
   • Caesar Cipher
   • Vigenère Cipher
   • Confederate Cipher Disk
   • German Enigma Machine
   • Code Talkers

2. Cipher Text

   • A cipher is a series of well-defined steps that can be followed as a procedure when encrypting and decrypting messages
     • Transposition Ciphers
     • Substitution

3. Cryptanalysis

   • Brute-Force
   • Ciphertext-Only
   • Known-Plaintext
   • Chosen-Ciphertext
   • Meet-in-the-Middle

4. Cryptographic Hashes

   • To provide proof of authenticity when it is used wi th a symmetric secret authentication key, such as IP Security (IPs ec) or routing protocol authentication.
   • To provide a message integrity check proof such as those accepted when accessing a secure site using a brows er.

5. Hashing

   • For integrity
   • For authenticity

6. Key Management

   • Generation
   • Verification
   • Storage
   • Exchange
   • Revocation and destruction

7. Encryption = Confidentiality

   • Symmetric
   • Asymmetric

8. Public Key Cryptography

9. Digital Signatures

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