Caesar Cipher Encoder Decoder Online
A powerful tool to encrypt, decrypt, and analyze Caesar ciphers
with advanced features including ROT13 and brute-force analysis.
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What is a Caesar Cipher?
The Caesar cipher is one of the earliest known forms of encryption. It's a substitution cipher where each letter in the plaintext is "shifted" a certain number of places down the alphabet. For instance, with a shift of 3, 'A' becomes 'D', 'B' becomes 'E', and the alphabet wraps around so 'Z' becomes 'C'.
Uses
- Educational purposes in cryptography
- Simple obfuscation of text
- ROT13 for hiding spoilers online
- Basic security in low-risk scenarios
How it Works
- Each letter is shifted by a fixed number
- Alphabet wraps around (Z → C with shift 3)
- Only 25 possible keys (weak security)
- ROT13 is a special case with shift 13