Proxy Digital Signature of Modern Distance Education System
现代远程教育系统中的代理数字签名*

Two proxy digital signature algorithms are studied in this paper,and they are mono-proxy digital signature algorithm and multi-proxy digital signature algorithm. There are characters of unforgeability, undeniability, identity verfiability, key reliability and disenrollmentity, etc. The requirements of the system authenticity in the modern distance education system can be met.