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A constructing compact HMAC (Hash-based Message Authentication Code) is required to maintain integrity and authentication in computationally constrained environments like Wireless sensor networks and RFID. DECIM is a hardware oriented stream cipher submitted to the ECRYPT stream cipher project. It is highly scrutinized stream cipher and is portable to implement hashing for highly compact MAC, which is required to achieve efficiency, while not sacrificing security. In this paper, the authors present advantages of DECIM-128 when compared to DECIMv2 in implementation as hashing in HMAC.
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