Using CA Tape Encryption in Your z/OS Environment › Business-to-Business Encryption Using Code Books › Code Books

Code Books

A code book is a file that contains a number of possible codes that CA Tape Encryption might use to form a unique symmetric key. The key is used to encrypt data files on B2B tapes for business partners who need to decrypt and read your data in a non-z/OS environment, such as Windows or Linux.

You can define any number of code books. Typically, you will have one code book for each of your non-z/OS business partners.

The code book method places information on the tape so that the Multiplatform Decryption Utility (MDU) can identify the following information:

• The specific code book used to encrypt the data on the tape.
• The specific elements of the code book that form the key needed to decrypt the data on the tape.