ACRIC claims to authenticate legacy industrial messages by encrypting a CRC computed with a secret vector, but the CRC's linear structure lets an attacker forge valid tags without knowing any secret.
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ACRIC: Securing Legacy Communication Networks via Authenticated Cyclic Redundancy Integrity Check
ACRIC claims to authenticate legacy industrial messages by encrypting a CRC computed with a secret vector, but the CRC's linear structure lets an attacker forge valid tags without knowing any secret.