Read-and-write property specifying the security policy (encryption) used when connecting to an OPC UA server. This property cannot be changed while communication is active. Possible values for this property are the following:

•1 - uspNone: Does not use encryption in the connection (default)

•2 - uspBasic128Rsa15: Uses the RSA algorithm with a 128-bit key in the connection

•3 - uspBasic256: Uses the AES algorithm with a 256-bit key in the connection

•4 - uspBasic256Sha256: Uses the SHA algorithm with a 256-bit key in the connection

This property is used together with the SecurityMode property to determine the type of security of the connection.