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RE: Introduction to Cryptography I: Encryption (Pt. 4 - Block Ciphers/Modes of Operation)
I am guessing that you didn't pad the first block with arbitrary data for the image :)
I am guessing that you didn't pad the first block with arbitrary data for the image :)
Not quite! That can be a problem with CBC if you're using the intitialisation vector "hack"... but only the first block would be affected! Hint: it's a big image, and the blocks are really small... watch for next post's retrospective for the full explanation :)