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Cryptography & Ciphers

Brute Force for XOR Cipher Processor

Apply XOR Brute Force with explicit key, format, and algorithm settings. Enter the data and key material, choose the parameters, then review the result.

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Apply XOR Brute Force with explicit key, format, and algorithm settings. Enter the data and key material, choose the parameters, then review the result.

This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.

Brute Force for XOR Cipher Processor uses XOR to process the supplied input. The operation returns bytes after applying XOR with the selected repeating or differential key scheme. This record describes key-space search for Brute Force for XOR Cipher Processor.

The operation returns bytes after applying XOR with the selected repeating or differential key scheme. This record describes key-space search for Brute Force for XOR Cipher Processor. Processing runs in the browser for this catalog category, so the result depends on the supplied bytes and settings. Processing runs in the browser.

XOR is a reversible byte operation, not proof of confidentiality or message integrity.

Instructions

  1. Provide text or data for this tool.
  2. Use a short public byte sample and one-byte key. This applies to Brute Force for XOR Cipher Processor.
  3. Keep the scheme and null-preserving option unchanged for reversal. This applies to Brute Force for XOR Cipher Processor.
  4. Select Hex output when the result is not readable text. This applies to Brute Force for XOR Cipher Processor.

Example

Input: Bytes "48656c6c6f" with key "aa" in Hex input and output. Operation direction: key-space search; algorithm: Brute Force for XOR Cipher Processor.

Settings: Brute Force for XOR Cipher Processor: Input and key: the selected byte encoding. Scheme: Standard, Input differential, Output differential, or Cascade. Set Null preserving only when the fixture requires it.

Result: The operation returns bytes after applying XOR with the selected repeating or differential key scheme. This record describes key-space search for Brute Force for XOR Cipher Processor. Processing runs in the browser for this catalog category, so the result depends on the supplied bytes and settings.

Limits

  • Brute Force for XOR Cipher Processor: XOR security depends on key secrecy, length, and reuse.
  • Brute Force for XOR Cipher Processor: A repeating or guessed key does not provide strong encryption.
  • Brute Force for XOR Cipher Processor: XOR does not authenticate the input or result.

Questions

Which XOR keys can this tool search?

Key length controls the candidate size, and the operation supports a small search space for browser use. It is not an unrestricted password or encryption-key search. Longer unknown keys require a different analysis approach.

How do sample and crib controls affect XOR candidates?

Sample length and Sample offset select the portion of input to examine. Crib filters results using expected plaintext. Keep the expected text precise, because an incorrect crib can hide the correct candidate.

Why does a candidate contain unreadable characters?

XOR candidate output can contain arbitrary bytes. Output as hex preserves those values when text rendering is unclear. A plausible candidate still needs verification against the whole message and the chosen Scheme.