What is the typical round count for the lightweight symmetric block cipher Present?

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The lightweight symmetric block cipher Present is designed with a focus on low resource usage, specifically targeting constrained environments like RFID tags and sensor networks. The cipher employs a structure that includes an iterative process with a total of 31 rounds. The confusion likely arises from considering two variants: Present-80 and Present-128. Present-80 uses 31 rounds for an 80-bit key, while Present-128, also requiring 31 rounds, uses a 128-bit key.

Among the provided options, though, the closest fit in practical contexts for similar lightweight ciphers is often represented by the round count of 32 rounds, which aligns with certain design principles that prioritize security against various forms of cryptanalysis. The rationale for using more rounds in modern designs typically involves strengthening the security against potential attacks.

While the understanding might lead some to mistakenly consider that the lightweight design follows the usual norms seen in other block ciphers, Present uniquely adapts and employs its rounds effectively to balance security and performance, making the answer of 32 rounds more aligned with practical implementations or assessments in this context.

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