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Tool Factory

Cryptography & Ciphers

Substitute Cipher Processor

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

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Needs input

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Options

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Apply Substitute 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.

Substitute Cipher Processor uses Substitute Cipher to process the supplied input. The operation returns transformed text according to its selected alphabet or cipher convention. This record describes cipher processing for Substitute Cipher Processor.

The operation returns transformed text according to its selected alphabet or cipher convention. This record describes cipher processing for Substitute 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.

This classical cipher operation transforms text by a known rule; it does not provide modern confidentiality or integrity.

Instructions

  1. Provide text or data for this tool.
  2. Use HELLO as a safe public test value. This applies to Substitute Cipher Processor.
  3. Record the alphabet and translation settings with the result. This applies to Substitute Cipher Processor.
  4. Round-trip the output when a paired operation exists. This applies to Substitute Cipher Processor.

Example

Input: Message "HELLO" with the operation defaults and a public sample key when required. Operation direction: cipher processing; algorithm: Substitute Cipher Processor.

Settings: Substitute Cipher Processor: Select the operation's documented alphabet, key, delimiter, or translation option. Use Text input and Text output for the readable fixture. Keep the same settings for the paired direction.

Result: The operation returns transformed text according to its selected alphabet or cipher convention. This record describes cipher processing for Substitute Cipher Processor. Processing runs in the browser for this catalog category, so the result depends on the supplied bytes and settings.

Limits

  • Substitute Cipher Processor: Classical substitution and transposition ciphers are not suitable for secret data.
  • Substitute Cipher Processor: Alphabet, spacing, and case rules can change the result.
  • Substitute Cipher Processor: A successful round trip does not prove security or message authenticity.

Questions

How do Plaintext and Ciphertext define a substitution?

Each position in Plaintext maps to the corresponding position in Ciphertext. The two alphabets should have matching lengths for an unambiguous mapping. The operation displays a warning when their lengths differ.

Can I reverse every substitution?

Only a one-to-one mapping is reliably reversible by swapping the alphabets. Repeated output symbols can destroy distinctions between different input symbols. Review both alphabets before relying on a round trip.

What does Ignore case affect?

Ignore case changes how the mapping looks up source characters. It does not search for an unknown substitution alphabet. Test mixed-case input if letter case matters to your example.