Specifies the security policy of the connection.

If you set SecurityMode to Sign or SignAndEncrypt you need additionally to set SecurityPolicy to one of the following values:

Parameter	Value
None	(1) http://opcfoundation.org/UA/SecurityPolicy#None
uaSPBasic128Rsa15	(2) http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15 (no longer considered as secure) (deprecated)
uaSPBasic256	(3) http://opcfoundation.org/UA/SecurityPolicy#Basic256 (deprecated)
uaSPBasic256Sha256	(4) http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256
uaSPAes128_Sha256_RsaOaep	(5) http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep
uaSPAes256_Sha256_RsaPss	(6) http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss

If the OPC UA supports not the combination of SecurityMode and SecurityPolicy, the components raises an exception with a list of all supported security modes of the OPC UA server.