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OPC-10000-4 – OPC Unified Architecture - Part 4: Services5.7.3.1 DescriptionCertificate . The data to sign is created by appending the last serverNonce to the serverCertificate specified in the CreateSession response. If a token includes a secret then it should ... encrypted using the public key from the serverCertificate. Servers shall take proper measures to protect against attacks on user identity tokens. Such an attack is assumed if repeated connection attempts
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OPC-10000-4 – OPC Unified Architecture - Part 4: Services7.41 UserTokenPolicyrequiring RSA based encryption algorithms can only be returned in EndpointDescription with an RSA ServerCertificate. If the SecurityMode is None, SecurityPolicies based on ECC or RSA_DH are not allowed ... these SecurityPolicies . RSA based SecurityPolicies are allowed, however, the Client shall only use a ServerCertificate which it trusts to encrypt UserIdentityTokens with tokenType USERNAME or ISSUEDTOKEN. If the SecurityMode