XOR Cipher & Multi-Byte Key Bruteforce Tool

Encrypt, decrypt, and crack single-byte and multi-byte repeating XOR ciphers with automated Hamming distance key-size detection and English frequency analysis.

How to Use XOR Cipher & Multi-Byte Key Bruteforce Tool

  1. Input Raw Text or Hex Bytes: Enter your string or hex values to process.
  2. Choose Key or Brute Force Mode: Enter a single-byte (0–255) or multi-byte key, or run XOR Brute Force to test all 256 single-byte keys automatically.
  3. Inspect Frequency-Scored Results: Review the bitwise XOR output and frequency-scored candidate plaintexts ranked by English readability.

Frequently Asked Questions

What is the fundamental property of bitwise XOR in cryptography?

XOR is self-inverting: A ⊕ B ⊕ B = A. Applying XOR with the same key twice restores the original value, making encryption and decryption identical.

Is XOR encryption secure?

A One-Time Pad using a truly random, non-repeating key equal in length to the message is mathematically unbreakable. However, repeating short keys is vulnerable to frequency analysis.