$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: double AES-ECB ciphertext where both keys have only 24 bits of entropy (time-seeded randint & 0xFFFFFF). Solution: meet-in-the-middle attack using a known-plaintext crib to recover both keys at ~2*2^24 cost instead of 2^48.
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