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The 53‑crack relies on two premises: (i) low diffusion in the first 53 rounds, and (ii) a linear key schedule. QI‑53‑MAC neutralizes (i) by inserting the MixColumns diffusion layer exactly after the 53‑rd round. Any adversary limited to 53 adaptive queries cannot observe the effect of this layer, and therefore cannot distinguish the MAC from a random function. quite imposing plus 53 crack mac new
Premise (ii) is mitigated by the plus‑imposing schedule, which makes each round key a non‑linear function of the previous key and a constant. The algebraic degree of RK_i grows with i, rendering linear approximations ineffective.
Message‑authentication codes are the workhorse of integrity protection in virtually every networked system. Classical designs—CMAC, HMAC, PMAC—rely on block‑cipher primitives whose security guarantees were historically established under the assumption that an adversary cannot mount high‑order differential attacks. In 2022 a team of cryptanalysts exposed a systematic weakness in several legacy MAC constructions, coining the term “53‑crack” to denote a family of attacks that succeed after 53 adaptive queries to the MAC oracle. The attack exploits an inadvertent linearity in the key schedule and a low diffusion rate across the first 53 rounds of the underlying permutation. The remainder of this paper details the construction,
The “new‑MAC” research agenda, championed by standards bodies such as NIST and ETSI, therefore calls for (i) higher diffusion early in the round function, (ii) a key‑mixing schedule that is quite imposing—i.e., deliberately complex enough to thwart algebraic simplifications—yet still lightweight, and (iii) a design that can be instantiated on low‑power micro‑controllers without sacrificing security.
In response to these demands we propose QI‑53‑MAC (Quite Imposing plus‑53 MAC). The name reflects two core ideas: its security proof
The remainder of this paper details the construction, its security proof, and an extensive performance evaluation.