Stream of Consciousness

The ciphertexts in the challenge are encrypted with AES-CTR with the same, new zero counter. Hence, the keystream used to xor the plaintexts to obtain the ciphertexts will be the same for all ciphertexts. This now becomes the classic, and taught by many cryptographic courses in universities worldwide about the many time pad. The one-time pad cannot be used multiple times (hence the name) because an attacker can xor the two ciphertexts to obtain the xor of the corresponding plaintext....

December 22, 2022 · 3 min · qvinhprolol