Polar Bear is a block cipher that was designed for use in cryptographic applications. It is part of the NIST (National Institute of Standards and Technology) Lightweight Cryptography project, aimed at developing cryptographic primitives suitable for constrained environments, including IoT (Internet of Things) devices. Polar Bear operates on a block size of 128 bits and supports key sizes of 128, 192, and 256 bits. Its design focuses on providing efficiency and security in lightweight contexts.
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