Through the PWHIST control option, a security administrator can specify the number of previous passwords that are to be maintained as part of an ACID’s password history. The reason for maintaining a password history is to prevent users from reusing old passwords everytime their current password expires. The number of old passwords that can be maintained by CA Top Secret ranges from 0 to 64. Specifying 0 indicates that no password history is to be maintained and that the user is able to make his new password identical to his current password.
CA Top Secret will reject all identical passwords going back as far as the specified PWHIST value. The value specified for PWHIST will, however, have no affect on ACIDs with the MULTIPW attribute, since those ACIDs have an internal PWHIST value of 3.
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