Cryptographic Services

Cryptographic Services

1. Securing Communications

   • Authentication
     • Guarantees that a message comes from the source it come from.
   • Data Integrity
     • Ensures that messages are not altered in transit
     • The received message is identical to the sent message
   • Data Confidentiality
     • Ensures privacy
     • A key is required to encrypt and decrypt a message
     • Only authorized entities can read the messages

2. Cryptography

   • Cipher methods
     • Scytale
     • Caesar Cipher
     • Vigenère Cipher
     • Enigma Machine
   • Creating ciphertext
     • Transposition
     • Substitution
     • One-time pad

3. Cryptanalysis

   • Cracking code
     • Methods
       • Brute-force
       • Ciphertext
       • Know-Plaintext
       • Chosen-Plaintext
       • Chosen-Ciphertext
       • Meet-in-theMiddle

4. Cryptology

   • Cryptanalysis
   • Keys

5. Cryptographic Hashes

   • Creating a Hash
     • Plaintext Message
     • Hash Function
     • Fixed-Length Hash Value