Patent ID: 9025768
Filing Date: 2015-05-05
Classification: G06F,H04L

Abstract:
1. A system, comprising: a direct memory access controller (DMAC) and a keyladder decryptor unit coupled with each other, where, the keyladder decryptor unit is configured to alter a first layer key and generate a content key by decryption of an encrypted second layer key with the altered first layer key, where the decrypted second layer key comprises a first sub-key, the keyladder decryptor unit further is configured to alter the first sub-key and decrypt an encrypted third layer key with the altered first sub-key, where the decrypted third layer key comprises a second sub-key that comprises, or is used for the generation of, the content key; and the DMAC is configured to decrypt encrypted content data using the generated content key; and where the keyladder decryptor unit is further configured to send the content key to the DMAC.