X.509 describes two levels of Authentication, simple authentication, based on use of a password to verify user identity, and strong authentication, using credentials created by cryptographic methods. The standard recommends that only strong authentication should be used as the basis of providing secure services. Public-Key Cryptography is used for strong authentication, but X.509 is not dependent on the use of a particular cryptographic Algorithm, though two users wishing to authenticate must support the same Algorithm.

譯文：

　　X.509描述了兩個級別的認證，簡單認證和強認證，簡單認證基于使用一個密碼驗證用戶身份，強認證使用加密方法創(chuàng)建的數(shù)字證書。標(biāo)準(zhǔn)建議只有強認證能夠作為提供安全服務(wù)的基礎(chǔ)。強認證使用公鑰加密方式，但是X.509并不依賴于使用特殊加密算法，盡管兩個用戶希望認證必須支持同一算法。

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