公开(公告)号：US09025768B2

公开(公告)日：2015-05-05

申请号：US13856651

申请日：2013-04-04

Applicant: Broadcom Corporation

Inventor： Shashank Shekhar ,  Shee-Yen Tan ,  Andrew Dellow

IPC: H04L9/00 ,  H04L29/06 ,  G06F13/28 ,  H04L9/08

CPC classification number: H04L63/0428 ,  G06F13/28 ,  H04L9/0822 ,  H04L9/0861 ,  H04L63/0435

Abstract: A system for securing a variable length keyladder key includes a keyladder decryptor configured to alter a first layer key and to execute a keyladder algorithm to generate a content key, the keyladder algorithm to generate the content key by decrypting an encrypted second layer key with the altered first layer key. The alteration mirrors the alteration applied to encrypt the second layer key by a content server providing content data to be decrypted. The system may further include a cryptographic direct memory access controller (DMAC) coupled with the keyladder decryptor and to decrypt encrypted content data using the generated content key. The keyladder decryptor may be further configured to send the content key to be stored in the DMAC without information regarding how the first layer key was altered. The alteration may include a permutation function or other change or modification.

Abstract translation: 用于保护可变长度键盘键的系统包括键盘解码器，其配置为改变第一层密钥并执行键盘算法以生成内容密钥，所述键盘算法通过用改变的密钥解密加密的第二层密钥来生成内容密钥 第一层密钥 该改变反映了由提供要解密的内容数据的内容服务器应用于加密第二层密钥的改变。 系统还可以包括与键盘解码器耦合的加密直接存储器访问控制器（DMAC），并且使用所生成的内容密钥来解密加密的内容数据。 键盘解码器还可以被配置为发送要存储在DMAC中的内容密钥，而没有关于如何改变第一层密钥的信息。 该改变可以包括置换函数或其他改变或修改。

公开(公告)号：US20140258708A1

公开(公告)日：2014-09-11

申请号：US13856651

申请日：2013-04-04

Applicant: BROADCOM CORPORATION

Inventor： Shashank Shekhar ,  Shee-Yen Tan ,  Andrew Dellow

IPC: H04L29/06

CPC classification number: H04L63/0428 ,  G06F13/28 ,  H04L9/0822 ,  H04L9/0861 ,  H04L63/0435

Abstract: A system for securing a variable length keyladder key includes a keyladder decryptor configured to alter a first layer key and to execute a keyladder algorithm to generate a content key, the keyladder algorithm to generate the content key by decrypting an encrypted second layer key with the altered first layer key. The alteration mirrors the alteration applied to encrypt the second layer key by a content server providing content data to be decrypted. The system may further include a cryptographic direct memory access controller (DMAC) coupled with the keyladder decryptor and to decrypt encrypted content data using the generated content key. The keyladder decryptor may be further configured to send the content key to be stored in the DMAC without information regarding how the first layer key was altered. The alteration may include a permutation function or other change or modification.

Abstract translation: 用于保护可变长度键盘键的系统包括键盘解码器，其配置为改变第一层密钥并执行键盘算法以生成内容密钥，所述键盘算法通过用改变的密钥解密加密的第二层密钥来生成内容密钥 第一层密钥 该改变反映了由提供要解密的内容数据的内容服务器应用于加密第二层密钥的改变。 系统还可以包括与键盘解码器耦合的加密直接存储器访问控制器（DMAC），并且使用所生成的内容密钥来解密加密的内容数据。 键盘解码器还可以被配置为发送要存储在DMAC中的内容密钥，而没有关于如何改变第一层密钥的信息。 该改变可以包括置换函数或其他改变或修改。