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论述了在RSA公开密钥密码算法下的多重公开密钥密码方案、密钥共享、多重密钥共享的技术,密钥的安全保密是密码系统安全的重要保证,存贮在系统中的所有密钥的安全性取决于主密钥的安全性.研究分析了密钥的秘密共享的LaGrange插值多项式方案.?适r“,”This paper discusses the technique of multi-key cryptography scheme、secret-sharing subject to RSA public-key cipher algorithm. Safety secret of the key is the important warrant for cipher system security. The security for all keys storing in the system depends on the security of the chief key. It also analyzes the Lagrange interpolation polynomial scheme of secret sharing of the key.