Data Security: rpu format files are encrypted electronic data file
SSL (Secure Sockets Layer Secure Sockets Layer ), and its successor, Transport Layer Security (Transport Layer Security, TLS)
For network communications to provide security and data integrity of a secure protocol. TLS and SSL in the transport layer is encrypted network connection.
Cryptography:
Advanced Encryption Standard (English: Advanced Encryption Standard, abbreviation: AES), in cryptography are also known as Rijndael encryption method, is the US federal government block cipher standard adopted
Internet Protocol Security, abbreviated as the IPsec), a protocol packet by the IP protocol in the packets for encryption and authentication to protect IP protocol network transport protocol group (a collection of interrelated protocols).
IPsec consists of the following protocol consists of:
An authentication header (the AH), an IP datagram to provide connectionless data integrity , message authentication and anti- replay attack protection;
二、封装安全载荷（ESP），提供机密性、数据源认证、无连接完整性、防重放和有限的传输流（traffic-flow）机密性；
三、安全关联（SA），提供算法和数据包，提供AH、ESP操作所需的参数
PKI是Public Key Infrastructure的首字母缩写，翻译过来就是公钥基础设施；