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RE: Introduction to Cryptography I: Encryption (Pt. 4 - Block Ciphers/Modes of Operation)
Interactive exercise
Below are two images; the one on the right is an encrypted version of the one on the left.
Woah! That doesn't seem right. Take your best guess at what went wrong here and explain how you came to that conclusion.
It seems like you have done a Substitution cipher. And it is easy to break.
You're the closest person here. Very close. Extremely close. Watch out for next post's retrospective.