Codec lesson · Personal Code
Personal Code: build a shared phrasebook
Personal Code lets you define phrase-to-phrase rules. It is useful when both people agree on the same codebook, but it is a convention rather than cryptography.
Completed in this browser
Personal Code lets you define phrase-to-phrase rules. It is useful when both people agree on the same codebook, but it is a convention rather than cryptography.
Rules live locally and can map whole phrases. The receiver needs the same mappings, but original letter case may still be normalized. Encode Keyboard supports exporting and importing a codebook so trusted people or devices can share it.
How Encode Keyboard handles it
Create a unique rule
Choose a source phrase and the phrase that will represent it. Conflicting mappings should be avoided.
Apply locally
The app or keyboard uses the stored codebook without uploading message content.
Share deliberately
Export and import can move rules, but the exported file reveals the mapping to anyone who receives it.
Worked example
meet at cafeblue rendezvousThis only decodes when the codebook defines the reverse relationship; original letter case may not be restored.
Good uses
- Reusable inside phrases and nicknames
- Shared conventions between trusted people
- Learning how codebooks map meaning
Validation and common errors
- The recipient needs the same rules
- Overlapping or conflicting phrases can be ambiguous
- Sharing the codebook exposes every mapping
Practice in your browser
Try the expressive result in Encode Keyboard
Create one unique phrase pair in the app, encode it, then decode it with the same codebook. Finally test an overlapping phrase so you can see why unique mappings matter.
