$ ctf42

VOODOO_Fault_Injections

Crypto No technique tags yet.
Difficulty Not rated yet

Flag format: ICHSA_CTF{...}

We've noticed the NSA is broadcasting a weird encrypted message repeatedly. So, we hired a shaman to help us extract the key of the encrypted message. The shaman did his work told us something like: "Using my black magic voodoo sh*t I've managed to zeroed out a different byte every broadcast, the byte was zeroed out in the data before the last AES 128 ECB sub-bytes round... I've also summoned a file called FLAG.enc". We told him: "WTF?!? Where is our key? We paid you a lot of money!". Anyway, we've manged to intercept 16 weird different broadcasts. Please help us retrieve the key.

Messages

[198, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 19, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 66, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 146, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 197, 28, 249] [207, 252, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 45, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 156, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 242, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 0, 249] [207, 24, 228, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 137, 250, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 255, 194, 247, 19, 38, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 16, 1, 203, 28, 249] [207, 24, 35, 170, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 130] [207, 24, 35, 13, 193, 72, 203, 250, 194, 247, 19, 38, 1, 203, 28, 249]

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