Using CA Tape Encryption in Your z/OS Environment › Integrated Compression for Symmetric Key Encryption › Sample Compression Scenarios › Compression Scenario with Global Minimum Compression Rate

Compression Scenario with Global Minimum Compression Rate

In this scenario the Compression= attribute in the dynamic options is set to K. This indicates that compression is applied based on the compression attribute specified for the individual key in the symmetric key options. The COMPKEY1 key is used to encrypt the file. It specifies the use of the S4 compression method. This key does not specify a minimum compression rate. Because the MinimumCompressionRate is specified in the <DynamicOptions> and not in the <SymmetricKey> options, the minimum compression rate of 75 percent is used based on the dynamic options.

In this scenario, the following settings are used for the <DynamicOptions> parmlib member:

<DynamicOptions>
  logdetaillevel =3
  logstream = VTAPE.XE90.LOG
  EncryptFailAction    = continue
  TMSUpdate            = Y
  Failovercandidate    = Y
  keyringsearchorder   =  UserKeyringFirst
  Compression = K
  MinimumCompressionRate = 75

In this scenario, the following settings are used for the COMPKEY1 key definition in the <SymmetricKey> parmlib member:

<SymmetricKey>

<COMPKEY1>
   Algorithm = AES128   
   Regenerate = monthly 
   Compression = S4