signature processing

The restriction of the available mobile terminal processing capacity and network resources leads to many security problems in the currrent mobile communication system security architectures. For example, it can not provide end-to-end data confidentiality, data integrity and digital signature service.

现有的移动通信系统由于受到移动终端处理能力和网络资源等多方面条件的限制，系统安全性还有很多欠缺，不能提供端到端的信息机密性和完整性保护以及数字签名安全服务等。

First of all, it makes out the processing flow of digital cinema security. And then the key technology, including symmetric encryption, asymmetric encryption, XML signature, XML encryption and digital certificate, is introduced.

首先根据DCI规范对安全的相关规定制定了对于数字电影发行包安全处理流程，然后介绍了里面用到的关键技术，如对称加密、非对称加密、XML签名、XML加密以及数字证书等。

Production is based on specimen signature of clients, it's using TC Scan, centre processing.

产品由客户签样为准, 采用电脑扫描 、 中心加工.

When you're signing a large number of small messages with asymmetric encryption, most of your processing time is spent on the signature step.

当使用非对称加密对很多消息签名时，大多数处理时间花在签名上。

But DES ( Data Encryption Standard) algorithm has the advantage of low calculating complexity, high processing speed, but it is difficulty to manage key and realize the digital signature.

而DES（Data encryption Standard，数据加密标准）具有运算复杂度较低，速度快等优点，但密钥不便管理，难以实现数字签名。