Classical Ciphers & Numeric Encoding

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Abstractions about substitution and transposition ciphers, frequency analysis, unbiased constants, binary offsets, and serial numeric representation.

6 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Caesar cipher — A monoalphabetic substitution cipher replacing each symbol with the symbol a fixed offset away in a cyclic alphabet.
• Frequency analysis — Cryptanalysis that exploits nonuniform symbol or pattern frequencies in ciphertext to infer a substitution or other weak classical encoding.
• Nothing-up-my-sleeve number — A cryptographic constant selected by a simple publicly verifiable procedure with little discretionary freedom, reducing suspicion that hidden properties or a backdoor were chosen deliberately.
• Offset binary — A signed-integer encoding that stores value n as the unsigned binary representation of n plus a fixed bias K.
• Serial decimal — A decimal computer representation that encodes each digit in a ten-bit one-hot group and processes digits or bits serially under the machine's arithmetic timing.
• Transposition cipher — A classical cipher that permutes plaintext symbol positions according to a key while preserving the symbol multiset, unlike substitution which changes symbol identities.