Aiming at the question of integrity of monitoring nods of Inernet of Things, a method was proposed for integrity verification and enhancement of monitoring nods of Internet of Things based on improved SHA-1. The technology of invariant properties fusion enhancement algorithm based on SHA-1 was introduced, and the thought,structure and flow of improved SHA-1 hash algorithm were proposed. Performance simulating demonstrates that the anti-collision performance and chaos and interspersion performance of the improved SHA-1 hash algorithm is much better than SHA-1. Compared with SHA-1, the average distance of digital fingerprints caused by improved SHA -1 hash algorithm may change 1 bit of plaintext, a deviation of 0.54% to theoretical value. And the average value of scrambing numbers decreased from 80.3583 to 80.0107.%针对物联网监测节点完整性问题,提出一种适用于物联网监测节点的基于改进SHA-1物联网监测节点完整性验证与增强方法.引入基于SHA-1的不变属性融合增强算法技术,提出改进SHA-1散列算法思想、结构与流程.性能仿真分析表明:改进SHA-1散列算法的防碰撞性能及混乱与散布性能较SHA-1算法有明显改善,其改变明文消息1个比特带来的数字指纹平均距离与理论值仅偏差0.54％,置乱数均值从80.358 3下降到80.0107.
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