Text Cipher

Encrypt and decrypt text using classical ciphers like ROT13, Caesar cipher, and Atbash. Great for learning basic cryptography concepts.

Cipher Type

Input Text

About Classical Ciphers

ROT13

Replaces each letter with the letter 13 positions after it in the alphabet. It's its own inverse (applying it twice gives the original text).

Example: "HELLO" → "URYYB"

Caesar Cipher

Shifts each letter by a fixed number of positions. Named after Julius Caesar who used it with a shift of 3.

Example: "HELLO" (shift 3) → "KHOOR"

Atbash

Reverses the alphabet (A↔Z, B↔Y, etc.). Used in Hebrew originally.

Example: "HELLO" → "SVOOL"

Vigenère Cipher

Uses a keyword to vary the shift amount for each letter. More secure than simple substitution.

Example: "HELLO" (key: "KEY") → "RIJVS"

Note: These are classical ciphers for educational purposes only. They are NOT secure for protecting sensitive information. Use AES or RSA for real encryption needs.

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