cryptoPromedium

Noncense

spbctf

Task: AES-CTR encryption with /dev/zero as random source producing zero nonce. Solution: Known plaintext attack using flag prefix to recover keystream, then XOR to decrypt.

$ ls tags/ techniques/
known_plaintextstream_cipheraesnonce_reusectr_mode
known_plaintext_attackkeystream_recoveryctr_nonce_reuse_attack
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