Defining Keys in Parmlib › Keys for Business Partners › Retain a Key for Modifying a Tape Using Digital Certificates › MOD Processing

MOD Processing

For keys created using digital certificates, the B2BRsaKeepHours attribute specifies the time interval that allows you to read back a tape you just created or to extend the tape using z/OS DISP=MOD processing. The same symmetric key you use to encrypt the first part of the data set must be used to encrypt any data you add to the data set through MOD processing. After the interval passes, the symmetric data encryption key is no longer available for use in MOD processing.

For keys created with a code book, you can perform MOD processing using the specific code book that was active when the tape was first created. The code book is available for 90 days from the time that it was rebuilt based on the settings for the REBUILD attribute in parmlib.