$ ctf42

Nonce_Sense

Crypto No technique tags yet.
Difficulty Not rated yet

freed Bob runs a little weekly broadcast. The safety bulletin goes out in the clear AND encrypted (so the regulars can verify the key is fresh); the flag drop goes out only encrypted.

Bob swears by AES-CTR, and this week he used a brand new 128-bit key. He did, however, reuse one other thing.

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