Cryptography
Source: Encryption, decryption, and cracking
Caesar Cipher
- One of the earliest encryption techniques
- Substitute letters by shifting set amount
Encryption
- SECRET MEETING AT THE PALACE
- Shift by 6 character
- YKIXKZ SKKZOTM GZ ZNK VGRGIK
Decryption
- Recipient must know the shift amount
- EHZDUH EUXWXV, shift 3
- BEWARE BRUTUS
Cracking the cipher
- Frequency analysis - Analyze frequency letters appear
- Plaintext - If you some smart part, easier to crack rest
- Brute force - Only 25 shifts, can try them each