此外，SAML提供了数字签名机制，该机制使断言具有有效时间范围，以防止断言以后被重播。
Additionally, SAML provides a digital signature mechanism that enables the assertion to have a validity time range to prevent assertions from being replayed later.
关于数字签名是否真正属于某个特定的人的问题很方便地转交给 PGP 本身用于建立信任的机制。
The question of whether a digital signature really belongs to a particular person is conveniently handed off to the mechanisms that PGP itself uses for establishing trust.
增加了新的状态按钮，表明接收的邮件是否使用数字签名、加密或者同时使用这两种安全机制。
A new status bar icon indicated whether email you receive was digitally signed, encrypted, or both.
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