Implement PKCS#7 padding

This is the first crypto challenge in set 2 from cryptopals, which is a set on block cipher cryptography. This is bread-and-butter crypto, the kind you'll see implemented in most web software that does crypto.

The difficulty level is relatively easy, to solve this problem I have used the programming language Go.

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 …

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