It is believed that in modern cryptography, any algorithm of encryption and decryption in cryptographical systems could be public, and the security should rely on the secure key.
现代密码学认为，任何加密体系的加密和解密算法都可以公开，其安全性在于密钥的保密性。
Applying the modern cryptographical technology constructs two digital copyright protection schemes.
利用现代密码技术构造了两个数字版权保护方案。
VPN cryptographical system is concerned with cryptographical technology, authentication technology and VPN implementation protocols.
VPN密码系统的构建涉及几个方面的技术，包括加密技术、认证技术、实现协议等。
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