一种低开销紧凑型对称加密算法的研究与实现

Research and Realization of Low-cost Compact Symmetric Encryption Algorithm

WSNs节点的电能、CPU计算能力和内存容量通常都非常有限,不宜采用复杂的加密算法。在Feistel密码结构的基础上提出了一种低开销的对称加密算法:LCCSEA算法。它采用较少的加密轮次、较短的数据分组降低加密的开销,同时采用较长的密钥和新型非线性置乱函数来提高LCCSEA算法的安全性。实验表明,LCCSEA算法具有较好的"雪崩"效应和数据混沌性,运算速度也比DES算法快得多,而且开销较小,非常适合资源有限的WSNs。

The CPU performance, battery and RAM capacity of WSNs sensors are all limited, so it is suitable to adopt the complex encryption algorithm. Based on feistel cryptosystem structure, the paper proposes a low - cost compact symmetrical encryption algorithm ： LCCSEA, which adopts minor encryption rounds and shor-ter data packet to decline encryption cost, and makes use of longer encryption key and novel nonlinear cram- bling function to raise the security of LCCSEA. The experiments demonstrate that the LCCSEA possesses bet-ter ＂avalanche effect＂ and data confusion degree, furthermore, its calculation speed is far faster than DES, but consumes very low resources, which is much suited for resource - restrained WSNs.