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Encrypting your data with z/OS DFSMS data set encryption

Db2 for z/OS uses z/OS DFSMS data set encryption to transparently encrypt Db2 data sets.

Requirements for using z/OS DFSMS data set encryption

Before you can use z/OS DFSMS data set encryption to encrypt Db2 data sets, make sure that your system meets the following requirements:

  • The operating system is z/OS V2R2 or later. For z/OS V2R2, the PTF for APAR OA50569 and APAR OA53951 must be applied.
  • Required hardware is installed. For details, see Using the z/OS data set encryption enhancements.
  • ICSF and RACF or equivalent security products.
  • The Db2 started task user ID and any user ID that is required to read or write to an encrypted data set is permitted to use any key labels that are used to protect Db2 data sets.
  • Any key label that is used to protect Db2 data sets is defined on all the members of a data sharing group and on any backup systems that might read or write from an encrypted data set.
  • Any user ID that is required to run any of the stand-alone utilities is authorized to use any key label that is used to protect Db2 data sets.
  • The prerequisite upgrades for your security product to support of z/OS data set encryption

Considerations for using z/OS DFSMS data set encryption

  • When Db2 compression is enabled, compression is performed before encryption.
  • z/OS DFSMS data set encryption supports only extended format sequential data sets and extended format linear data sets.
  • When Db2 is at function level 100, this function works in a co-existence environment with Db2 11.
  • The Db2 address space ID access to the key label is checked by DFSMS only during data set opening.
  • For a disaster recovery situation, if the data has to be accessed at another physical site then the ICSF keys and RACF profiles must be set up similar to the originating site. The same rule applies to Db2 source and proxy sites in GDPS® Continuous Availability with zero data loss solution environment. Refer to the Sample procedure for setting up z/OS DFSMS data set encryption for procedure to configure ICSF and RACF.

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