Encrypts and decrypts text using the Caesar cipher — a substitution cipher that shifts each letter by a fixed number of positions in the alphabet. Configure the shift amount (1–25). A brute-force mode shows all 26 possible shifts at once so you can identify the correct decryption without knowing the shift value.
Enter text and a shift to encrypt or decrypt with the Caesar cipher — or brute-force all 26 shifts to break an unknown cipher. For stronger cipher-based encryption, the Vigenère Cipher uses a keyword for polyalphabetic substitution.
Shift 13
Input
Hello World
Output
Uryyb Jbeyq
Encrypt and decrypt text using the Vigenère polyalphabetic cipher.
Encode or decode text using the ROT13 substitution cipher.
Encode text to hexadecimal or decode hex back to text.
Encode text as a Base64 string.
Generate HMAC signatures using SHA-256, SHA-512, and other algorithms.
Check password strength against security criteria and estimate crack time.