Writeup for the Haggis flag.

The challenge is the following:

• A message \(m\) is padded, then encrypted using AES in CBC mode, with known key \(K=0\) and IV \(IV=0\), to ciphertext \(c\).
• \(m\) needs to start with "I solemnly swear that I am up to no good.\0 …

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