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Digital signatures use message encryption, but in reverse A digital signature is simply a string that is encrypted with a private key so that it can only be decrypted with a corresponding public key The correct decryption of the string (for example, my name) is public information, so after someone decrypts the string using my public key, the person can verify that my name was stored in the message Trust is another important aspect of certi cates In our example of exchanging messages with a friend, how do we know that we have the public key of our friend and not of our enemy For a client and service to trust that each other s certi cates are correct, valid, and have not been revoked, they must trust a common authority It s okay if the client and service use certi cates issued by different authorities, as long as those authorities both trust a third, common authority The common authority is often referred to as the root authority, which typically is self-signed, meaning that it doesn t trust anyone else When a client receives a certi cate from a service, it looks at the certi cation path of the service certi cate to see if the path is valid and terminates at a trusted authority If so, the client trusts that the certi cate is valid; if not, it rejects it There are provisions in WCF for disabling the certi cation path validation so that untrusted certi cates can be used in development and testing
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Setup Certi cates can be used for transport- or message-level security A commonly used transport-level encryption option, SSL, is applied to the transport by using a certi cate on the server Message-level encryption works on individual messages Whereas transport-based encryption requires a certi cate to be installed with the service, message-based encryption supports a variety of modes with client and/or server certi cates The examples in the Transport-Level Security and Message-Level Security sections of this chapter will use two machines: a Vista desktop and a Windows 2003 server The desktop has a certi cate, MyClientCert The server has a certi cate, MyServerCert Listing 82 shows the commands that run on Vista to generate the necessary certi cates Makecertexe creates switch makes the private key exportable The a certi cate The switch de nes the name of the certi cate that will be the name that is used
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for authentication The switch de nes the private key le The switch can be exchange or a digital signature Pvt2pfx is a utility that combines the private key and public key into a single le If you re developing on one machine, change the name MyServer to localhost All other instructions will remain the same
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Keep in mind that certi cates generated in this fashion should not be used in production scenarios Certi cates for use in production environments should be requested from a trusted third-party certi cate authority
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Listing 82 Generating Certificates
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The cer le is the public key, the pvk le is the private key, and the pfx le is a key exchange le that contains both The following keys must be installed using the Certi cates snap-in in the Microsoft Management Console 1 Install the following on the server, in the local computer certi cate store: to the Personal folder This enables the a Import server to decrypt messages that have been encrypted with its public key It also enables the server to encrypt messages with its private key
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b Import to the Trusted People folder This enables the server to decrypt messages that have been encrypted with the MyClientCert private key, such as data messages and digital signatures for authentication It also enables the server to encrypt messages with the MyClientCert public key 2 Install the following on the client, in the current user certi cate store: to the Personal folder This enables the a Import client to decrypt messages that have been encrypted with its public key It also enables the client to encrypt messages with its private key to the Trusted People folder This b Import enables the client to decrypt messages that have been encrypted with the MyServerCert private key, such as data messages and digital signatures for authentication It also enables the client to encrypt messages with the MyServerCert public key
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