| 摘要 |
<p>The data package format (265) is used within a CD ROM. The data package format (265) includes a header (254) which incorporates a data package message key (256), and optionally a subunit header (262) which incorporates a subunit message key (264). Each data package (265) includes a clear text abstract (258) and encrypted data (260, 266). The DB message key (256) from the DB info record (222) is encrypted using CK as the key in the encryptor (252) to produce DB keys which are used to encrypt the message keys (256) in the encryptor (268). The resulting clear DP key at the output of the encryptor (268) is used in the normal mode as the key to decrypt the data in the decryptor (270), resulting in clear text.</p> |
