Communication support services

Communication support services include connectivity-related services

Some connectivity-related services are:

Authentication, which is the process of verifying the identity of a user or an application. The most common form of authentication is to require the user to enter a name and password to obtain access to a computer or an application.
Message integrity, which ensures that communication messages are intact and unaltered when they arrive at their destination.
Message confidentiality, which protects messages from unauthorized viewing, usually through encryption and decryption, during transmission.

Communication support services can also include other processing such as data compression or traffic-based accounting.

The database server provides extra security-related communication support services through plug-in software modules called Communication Support Modules (CSM). The database server uses the default authentication policy when you do not specify a communications support module.

Note: Support for Simple Password Communication Support Module (SPWDCSM) and Encryption Communication Support Module (ENCCSM) is removed starting Informix Server 14.10.xC9. Generic Security Services Communication Support Module (GSSCSM) continues to be supported. You should use Transport Layer Security (TLS)/Secure Sockets Layer (SSL) instead.