OTP/HOTP/TOTP的资料

参考资料

• 【加解密】动态令牌-(OTP,HOTP,TOTP)-基本原理
• 每天一个小知识：HOTP
• HOTP和TOTP算法图解

RFC

• HMAC: Keyed-Hashing for Message Authentication
• HOTP: An HMAC-Based One-Time Password Algorithm
• TOTP: Time-Based One-Time Password Algorithm