Cryptographic Systems

Cryptographic Systems

1. Cryptography

   • the development and use of codes

2. Cryptanalysis

   • the breaking of those codes

3. Hash

   • MD5
     • Ron Rivest
     • 128 bits
     • One-way
   • SHA-256
     • (NIST) -1994
       • SHA-1
         • Family SHA-2
           • 224,256,384,512
   • Ensures data Integrity
   • h=H(x) one-way

4. Keys

   • Types
     • Symmetric keys
     • Asymmetric keys
     • Digital signatures
     • Hash keys

5. Encryption Algorithms

   • Symmetric algorithms
     • Block Ciphers
     • Stream Ciphers
   • Asymmetric algorithms
     • RSA
     • DSS/DSA
     • DH

6. Digital Signatures

   • private key
   • public key
   • Deffire-Helman

7. Signing

   • Sode Signing
   • Digital Certificates