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The term "pen and paper" can practically be interpreted as "using no tools like electronic devices", since it targets cryptographic functions, schemes, and procedures which can be handled by humans who have nothing more available than the option to use manual writing. So, "pen and paper" can also mean "pencil and post-it", "chalkboard and chalk", "wall and spraycan", etc. Mental calculations and reasoning processes are also included.

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Text cipher option that can decrypt the same ciphertext to two DIFFERENT and DESIRED outputs...

I have a pen pal that I discuss with. In our latest discussion it was proposed to write a short message that is ciphered and have the other one find what it is, given some clues. I would like to ask i …
Lucian Viorel's user avatar
1 vote

Text cipher option that can decrypt the same ciphertext to two DIFFERENT and DESIRED outputs...

I've been thinking about this for a while and I can only think of one possible solution. If you want to share two different messages with the same cypher text then you might be able to use a "one-time …
Lucian Viorel's user avatar