摘要： TOTP - Time-based One-time Password Algorithm is an extension of the HMAC-based One Time Password algorithm HOTP to support a time based moving factor.TOTP（基于时间的一次性密码算法）是支持时间作为动态因素基于HMAC一次性密码算法的扩展。维基百科：http://en.wikipedia.org/wiki/Time-based_One-time_Password_AlgorithmRFC 6238：http://tools.ietf.org/ 阅读全文