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Cryptography & Ciphers

Cetacean Cipher Encoder

Convert text into the Cetacean E/e format in your browser. Keep literal spaces and decode the result without a key.

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Convert text into the Cetacean E/e format in your browser. Keep literal spaces and decode the result without a key.

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

Cetacean Cipher Encoder writes each character as 16 binary digits, using uppercase E for 0 and lowercase e for 1. Spaces stay as single spaces. hi becomes EEEEEEEEEeeEeEEEEEEEEEEEEeeEeEEe.

Each non-space character produces 16 symbols, so the output is about 16 times longer than the input. An emoji produces 32 symbols because it uses two UTF-16 code units.

  • Write a puzzle clue that looks like a string of E and e characters.
  • Show the 16-bit binary form of each character in a short word.
  • Produce test input for a Cetacean decoder you wrote yourself.

Sources: Unicode FAQ: UTF-16 code units

Instructions

  1. Type the text into Input. Every character except a space becomes 16 symbols.
  2. Copy the output without changing letter case. A changed case changes the decoded character.
  3. Paste the output into Cetacean Cipher Decoder to confirm the round trip.

Example

Input: hi there

Settings: Cetacean Cipher Encoder has no key or options.

Result: EEEEEEEEEeeEeEEEEEEEEEEEEeeEeEEe EEEEEEEEEeeeEeEEEEEEEEEEEeeEeEEEEEEEEEEEEeeEEeEeEEEEEEEEEeeeEEeEEEEEEEEEEeeEEeEe

Cetacean Cipher Encoder turns each of the 7 letters into a 16-symbol block. The space between the words stays a single space.

Limits

  • Some chat apps or editors change letter case or wrap long lines. Either change breaks decoding.
  • The format has no key. Anyone who knows the rule can decode the output.

Questions

How does Cetacean cipher encoding work?

The encoder represents each UTF-16 code unit with 16 E or e symbols. Uppercase E represents 0 and lowercase e represents 1. Literal spaces stay as spaces in the output.

What is a simple Cetacean cipher example?

The letter A encodes as EEEEEEEEEeEEEEEe. The 16 symbols represent binary 0000000001000001. Decode the same value to recover A, and preserve its letter case.

Does Cetacean encoding protect a secret?

No. Cetacean is a reversible text representation with a fixed mapping. Anyone can reverse it without a key. Use modern authenticated encryption when you need confidentiality or tamper detection.