关键词: 可信计算, 组合公钥（CPK）, 身份认证, 可信登录, 串空间模型

Abstract: Identity authentication for user login is very important to the operation system，and is the basis for building the trus-ted computing environment.The related technology of authentication is discussed.The theory of CPK（Combination of Public Key） is introduced.In addition，according to the standards of the Trusted Computing Group（TCG），using CPK and dynamic authentication code technology，a trusted computing platform login authentication scheme based on CPK is proposed.The scheme is double ingredient，separates authentication and warrant strictly.This paper not only shows a heuristic analysis about the characteristic and security of the scheme，but also，in strand space model，proves the security of the scheme，which indicates the scheme is more secure than the corresponding scheme presented in TCG standard.

Key words: trusted computing, Combination of Public Key（CPK）, identity authentication, trusted login, strand space model