Cryptopals Set 2

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Been a while since I wrote about Set 1, but frankly it takes probably twice as long to explain something than it does to actually do it.
Anyway, here’s Cryptopals Set 2.
Set 2 Challenge 1 (Number 9): Implement PKCS#7 padding Puzzle A block cipher transforms a fixed-sized block (usually 8 or 16 bytes) of plaintext into ciphertext. But we almost never want to transform a single block;…

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