.-ENCR--=--OPT------. >>-+-------------------+--------------------------------------->< | .-OPT--. | '-ENCR--=--+------+-' +-COND-+ +-NONE-+ +-REQD-+ '-SEL--'
| statements: | GROUP, APPL |
| dependencies: | none |
Specifies
whether this application program has any special requirements for
enciphering and deciphering messages.
- ENCR=COND
- Specifies that this application program will establish an encrypted
session if the session partner supports encryption and cryptographic
product support is available. If support is not available at session
start, a clear session (without encryption) is established. VTAM® starts sessions when all the following statements are true:
- ENCR=COND is coded on the APPL definition of the PLU
- The SLU has an APPL definition with ENCR=COND or an LU definition with ENCR=OPT
- A cryptograpic support is unavailable
In VTAM, the COND option includes a test to determine if cryptograpic product support is available on the primary logical unit (PLU). However, if either end of a session specifies a higher level of encryption than ENCR=COND (ENCR=SEL or ENCR=REQD), an encrypted session is required and no test is made to determine if cryptographic product support is available.
- ENCR=NONE
- Specifies that this application program cannot have cryptographic sessions.
- ENCR=OPT
- Specifies that the application program has no special cryptographic requirements; its cryptographic capability is the same as the host processor’s capability.
- ENCR=REQD
- Specifies that VTAM must encipher all messages to and from the application program. If ENCR=REQD, this application program cannot be started unless the host with which it is associated can handle cryptographic sessions. ENCR=REQD also means that this application program cannot start a session with a logical unit that cannot encipher and decipher its messages.
- ENCR=SEL
- Specifies that this application program can choose which messages are enciphered by VTAM. ENCR=SEL also means that this application program cannot start a session with a logical unit that cannot encipher and decipher its messages. If you code ENCR=SEL, this application program cannot be started unless the host in which it resides can handle cryptographic sessions.