几种高清光盘的内容保护系统

文中介绍了用于高清光盘保护的内容加扰系统(CSS)、预录制媒体内容保护(CPPM)、移动媒体内容保护(CPRM)和高级内容访问系统(AACS),重点介绍了AACS的内容保护体系。     

关于拷贝控制与连接保护技术的讨论

广播电视数字化的推进以及家庭消费电子设备的更新换代也大大增加了数字内容盗版的可能,给内容提供者和网络运营商造成了巨大的经济损失.近几年,国际上提出了各种拷贝控制和连接保护技术来保护数字内容,遏止盗版.首先,本文对国内外提出的拷贝控制和连接保护技术,如针对光盘的拷贝控制技术CPPM、 CPRM、 DVD CSS, AACS, 以及连接保护技术DTCP、 HDCP和UCPS等进行了讨论分析.然后,提出在现阶段可以将广播标记技术与拷贝控制技术、连接保护技术联合使用,构建一个过渡阶段使用的开放的数字内容保护系统.     

AACS-compatible multimedia joint encryption and fingerprinting: Security issues and some solutions

In this paper, a new multimedia joint encryption and fingerprinting (JEF) scheme embedded into the advanced access content system (AACS) is proposed for multimedia transmission over networks. AACS is selected because it has been jointly developed by many famous companies and has been considered as the leading technology in content access control and multimedia distribution. In this framework, many attack points exist and can be exploited to defeat it. Furthermore, multiple attack points can be combined to form multi-point collusion attacks, which also endanger the proposed system. In this paper, we address the security concerns toward AACS-compatible JEF system in its entirety and propose solutions to cope with some security threats. The contributions of this paper include: (i) applying multimedia encryption at different points to resist some attacks points; (ii) proposing rewritable fingerprint embedding (RFE) to deal with some multi-point collusion attacks; (iii) designing a perceptual security spectrum metric (PSSM) to evaluate the degree of security when multiple encryptions are applied. The feasibility of the proposed AACS-compatible JEF method is further demonstrated through simulation results.     

Differential effects of obesity on acetoacetyl‐CoA synthetase gene in rat adipose tissues

In order to investigate the physiological role of the ketone body‐utilizing enzyme acetoacetyl‐CoA synthetase (AACS) in obesity‐induced metabolic derangements, we examined the mRNA levels of AACS and other lipogenic enzymes in white adipose tissues (WAT) in the different types of obesity, genetic (Zucker fatty) and high‐fat diet (HFD)‐induced obesity. Plasma ketone body levels and gene expression levels of AACS and acetyl‐CoA carboxylase‐2 (ACC‐2) in WAT were lower in Zucker fatty rats than in lean rats. On the contrary, in HFD‐induced obese rats, these levels were increased. Moreover, AACS mRNA expression was affected only in subcutaneous WAT by each type of obesity. Our data suggest that AACS mRNA expression is related to obesity‐induced alteration of plasma ketone body levels, and that AACS in subcutaneous WAT plays an important role in the regulation of lipogenesis and ketone body utilization in various obese conditions.     

密钥管理系统在数字电影播放中的实现

高级内容访问系统(AACS)是蓝光光盘和HD DVD采用的安全标准。该文通过剖析AACS,提出使用软件解密的多处漏洞,给出以AES算法为核心的密钥管理系统(SMS)。该解密系统采用硬件实时解密,已经在数字电影服务器中使用,可以有效避免软件解密的多种问题。密钥管理系统还采取了额外的措施保护固化的密钥。     

AACS内容保护安全性分析

高级内容访问系统（Advanced Access Content System,简称AACS）是一种为了保护数字内容安全合法被传播使用的基于加密、认证机制的技术.全文从内容保护链、基于录制与预录制介质内容加解密的实现原理两个方面介绍此技术,并分析该技术基于录制和预录制的内容保护的安全性.     

组合预测在分销系统辅助决策中的应用

高级内容访问系统(AACS)是蓝光光盘和HD DVD采用的安全标准.该文通过剖析AACS,提出使用软件解密的多处漏洞,给出以AES算法为核心的密钥管理系统(SMS).该解密系统采用硬件实时解密,已经在数字电影服务器中使用,可以有效避免软件解密的多种问题.密钥管理系统还采取了额外的措施保护固化的密钥.