4.5.7 Encryption

4.5.7 Encryption

1. Meaning, definition and application

   • Cipher
   • Plaintext
   • Ciphertext

2. Caesar cipher

   • How is plaintext encrypted?
   • How is ciphertext decrypted?
   • Why can it be easily cracked?

3. Vernam cipher or one-time pad

   • How is plaintext encrypted?
   • How is ciphertext decrypted?
   • Why is it considered to offer perfect security?

4. Computationally secure ciphers

   • Vernam vs. ciphers that depends on computational security

5. Other types of ciphers