基于国密SM2算法的广播加密方案设计

Design of Broadcast Encryption Scheme Based-SM2 Algorithm

广播加密广泛应用于付费电视、卫星广播通讯、数字版权分发(CD/DVD)等领域。SM2公钥加密算法基于椭圆曲线设计,安全高效并应用于物联网等领域。为将SM2算法应用在多接收者背景,本文在国密SM2公钥加密算法的基础上提出一个广播加密方案,方案具有较低的计算和通讯开销。方案的系统参数和密钥大小固定,密文长度与接收者数目呈线性相关,实验表明解密时间受接收者数目影响较小。

Broadcast encryption is used extensively in pay TV, satellite broadcast transmission, distribution of digital copyright products(e.g. CD/DVD), and other fields. The SM2 public key encryption technique based on elliptic curve(EC) design is safe and efficient, which is utilized in embedded IoT and related industries. In order to apply the SM2 algorithm to the multi-receiver background, this paper proposes a broadcast encryption scheme based on the secret SM2 public key encryption algorithm with low computational and communication overheads. The system parameters and key size of the scheme are constant, and the ciphertext length is linearly related to the number of receivers. Experiments show that the decryption time is less affected by the number of receivers.