关键词: SHA iButton, SHA-1, secret, MAC, challenge, authentication, ecash, entropy, random numbers, cryptography, digital signature
Abstract: Several applications use the Maxim SHA iButton® tokens for eCash, vending, fare collection, and user authentication. They require the use of secrets to recognize authentic tokens and to secure data and monetary values against tampering. The security of an entire cryptographic system rests with its ability to properly generate and protect its secrets and challenges. This application note describes methods to generate world-class cryptographic secrets and challenges. It also describes the devices that can hold those values where they are safe from attack, and describes schemes where secrets never leave the protected silicon environment at any time and are never subject to compromise.
SHA iButton Secrets and Challenges.pdf 
STM32
MCU
通讯及无线技术
物联网技术
电子DIY
板卡试用
基础知识
软件与操作系统
我爱生活
小e食堂