WCF Message Level Security

<security mode="Message">
    <message clientCredentialType="Certificate" />
</security>

<behaviors >
    <endpointBehaviors>
        <behavior name="your_binding_behavior">
            <clientCredentials>
                <clientCertificate findValue="[The name of the client certificate here]"
                                   storeLocation="LocalMachine"
                                   storeName="My"
                                   x509FindType="FindBySubjectName"/>
                <serviceCertificate>
                    <defaultCertificate findValue="[The name of the server certificate here]"
                                        storeLocation="LocalMachine"
                                        storeName="TrustedPeople"
                                        x509FindType="FindBySubjectName"/>
                    <authentication certificateValidationMode="PeerOrChainTrust"/>
                </serviceCertificate>
            </clientCredentials>
        </behavior>
    </endpointBehaviors>
</behaviors>