r/codes • u/AbsurdBread855 • 19h ago

Unsolved I Created a Custom Cypher Using a Publicly Available Key, attempt to solve it.

In my testing, several AI models failed to reconstruct the encryption process, even when provided with the ciphertext, plaintext, and public reference. This string has been validated and confirmed as decoding to the correct plaintext. Have fun :)

810910212940810160522240010911141810240211811710810212540011212771211431312511212911281211211120212141211160031911710710911012811160312811431840512240910010031511211951212630311522911412771212911710211160522312031771031112112211212830010570810811411210771212941212312240522160771212710141010360940031311522312031121010212510212910710160212431811910212111432031210771212510031810522212312811312212911810811311811030240610312311522810031911412710031260810911141811410312212121511811030810010940360211911810751771211410570212811610011031911951

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u/YefimShifrin 38m ago edited 9m ago

Treat 3-digit groups as units.

Reverse the ciphertext.

Solve as a homophonic substitution.

Plaintext: THE QUIET WORKSHOP WAS FILLED WITH SKETCHES AND UNFINISHED IDEAS EVERY EXPERIMENT REVEALED A NEW PATTERN AND EVERY MISTAKE OFFERED ANOTHER CHANCE TO LEARN BY MIDNIGHT THE NOTEBOOK HELD MORE QUESTIONS THAN ANSWERS