All he needs to do is to open the message to see an indication that he received a signed message 他只需要打开这条消息，然后他将看到一个提示，说他接收了签署的消息。
What happens if the malicious party claims that it has received the signed message from the sender 如果该恶意方声称从发送方收到了经签名的消息的话，会发生什么情况呢？
A signature key is an asymmetric key pair used for authenticating digitally signed messages or files 签名密钥是不对称密钥对，用于对数字签名的消息或文件进行身份验证。
Using this standard , you can implement signed messages , enveloped messages , or signed and enveloped messages 使用此标准，可以实现签名邮件、封装邮件或签名和封装的邮件。
For signing messages , you encrypt the signature with your private key , so only your public key can unlock it 对签名信息，你用你的私钥加密签名，那只有你的公钥才能解开它。
12 if a digitally signed message has been altered during the transmission process , you will notice that 12如果一个经数码签署后的讯息，在传送过程中其内容曾被人改动，你将会发现：
Your public key 12 if a digitally signed message has been altered during the transmission process , you will notice that : a 12如果一个经数码签署后的讯息，在传送过程中其内容曾被人改动，你将会发现：
The signed message digest can be appended to the code and distributed with the developer s public certificate 经过签名的消息摘要可以附加到此代码上，并用开发人员的公共证书来分发此信息（代码和消息摘要） 。
The public key can be obtained either from the receiver s ca public directory or received through a previous signed message from the receiver 公开密码匙可以从收件人的核证机关公开目录中获取，或透过收件人曾经数码签署的邮件接收得到。
This is important when validating signed messages , since the signature must have been valid at the time of signing , not at the time of validation 由于签名必须在签名时有效，而不是在验证时有效，因此当验证已签名消息时，这一点非常重要。
