cryptoProeasy

AES-CTR

spbctf

Task: AES-CTR encrypted PNG file with static counter implementation. Solution: Exploit keystream reuse by XORing known PNG header with ciphertext to recover keystream, then decrypt entire file.

$ ls tags/ techniques/
known_plaintextpngaesctr_modestatic_counter
ctr_keystream_reuseknown_header_attack
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