[Cryptography] creating test vectors

[Joachim Strömbergson]

Typically you see:

- “abc”
- all zero, all ones
- every even, every odd bit set
- Known text snippets. Makes it easy to read when decrypted
- Test vectors that verify block boundaries, any padding schemes (like forcing one extra block in the case of SHA-256 for example.). Edge cases
- Test vectors that check specified requirements, limits, constraints
- Long runs - 1M blocks for block cipher, hash function

On 31 Aug 2026, at 10:55, Pierre Abbat wrote:
> I have some 96-byte
> keys which differ in the last byte, which will result in only a few bytes
> different in the ciphertext.

That sounds _very_ concerning.

/JS
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