基于RSA的组播加密方法及其密钥管理方案

Multicast encryption method based on RSA and key management model

密钥更新效率是影响安全组播性能的重要因素.为了避免安全组播中的密钥更新,强化密钥管理和提高安全组播的效率,在分析安全组播需求的基础上,提出组播加密方法的思想.并通过对RSA公钥密码算法的改进,给出一种新的组播加密方法,进而给出相应的密钥管理方案.分析表明,基于RSA的组播加密方法具有用一把密钥加密,多把密钥解密的功能.相应的密钥管理方案实现了在任何组成员变化时,都不需要更新密钥,并且仍能满足前向和后向加密及抗同谋破解的安全组播需求.

The efficiency of re-keying is a main factor that influences the performance of secure multicast.In order to avoid re-keying of secure multicast,to enhance the key management and raise the secure multicast efficiency,a new thought of multicast encryption based on the requirement of secure multicast is raised.Through some improvement to the RSA public key system,a new method of multicast encryption is put forward and then corresponding key management model is given.By analyses,the new algorithm based on RSA can perform the function that there is one key for encryption and many keys for decryption.The key management model needs no re-keying when any member changes and can satisfy the requirements of secure multicast of forward /backward confidentiality and collusion freedom.