ICSF supports VTAM session-level encryption, which provides protection for messages within SNA sessions—that is, between pairs of logical units.
When VTAM session- level encryption is in effect, only the originating logical unit can encipher the data, and only the destination logical unit can decipher the data. Thus, the data never appears in the clear while passing through the network.
ICSF places no restrictions on the addressing mode of calling programs. In particular, when VTAM session-level encryption is used with ICSF, VTAM can use storage above 16 megabytes.