数字图书馆信息分级保密研究

Study on hierarchical encryption of information of digital library

利用RSA密码算法和对称加密算法研究数字图书馆信息分级加密算法.在该算法中,对于核心级信息(一级信息),采用RSA密码算法进行加密和解密;对于内部级信息(二级信息),采用RSA及对称密码算法进行加密和解密.一级管理员可以解密一级信息和二级信息,而二级管理员只能解密二级信息,其他人无法解密.这种分级保密措施不仅适应数字图书馆不同用户的保密需求,而且便于对信息进行分级管理,具有可用性和有效性.

Using RSA encryption algorithm and symmetric encryption algorithm,the hierarchical encryption algorithm for different levels of information of digital library was proposed.In this algorithm,the core infor-mation （first level information）was encrypted and decrypted using RSA,and the inside information （sec-ond level information）was encrypted and decrypted using RSA and symmetric algorithm.The first level manager could decrypt the first level information and the second level information,but the second level manager could only decrypt the second level information.None but the first level manager or the second level manager could decrypt.This kind of hierarchical management could not only satisfy the security requirements for different users of digital library,but also facilitate the hierarchical management of different levels of information for digital library.The hierarchical encryption scheme had the availability and effec-tiveness.