A novel broadcast encryption scheme for group communication scenarios in distributed networks is presented. In the scheme, anyone is allowed to encrypt a message and distribute it to a designated group. Each member in...A novel broadcast encryption scheme for group communication scenarios in distributed networks is presented. In the scheme, anyone is allowed to encrypt a message and distribute it to a designated group. Each member in the designated group has the ability to independently decrypt a ciphertext. In contrast to traditional broadcast encryption, all the valid receivers in the proposed scheme compose the designated group. To take advantage of this property, a tab for the group is set and the matching private key for each member is generated. In addition, before decrypting a ciphertext, anyone in the scheme can verify the ciphertext, to ensure that the ciphertext is correct. This property is very important for large-scale group communication, as the gateway can filter incorrect ciphertext and alleviate the receiver's workload. Finally, a proof in the random oracle model is given, to show that the proposed scheme is secure against the adaptively chosen ciphertext attack.展开更多
为了抵抗量子计算机的攻击,相关的后量子密码算法被先后提出.NTRU(Number Theory Research Unit)密码算法是基于格理论的典型算法之一,在NTRU密码方案的硬件设计及实现过程中,主要会面临格攻击、简单能量攻击、差分能量攻击及相关能量...为了抵抗量子计算机的攻击,相关的后量子密码算法被先后提出.NTRU(Number Theory Research Unit)密码算法是基于格理论的典型算法之一,在NTRU密码方案的硬件设计及实现过程中,主要会面临格攻击、简单能量攻击、差分能量攻击及相关能量攻击等风险.为了解决NTRU算法在实现过程中的侧信道攻击安全隐患,提出一种新的全同态掩码防御方案,并给出电路设计参考模型,所提出方案能够对NTRU算法所有系数执行掩码操作并防范能量攻击.本方案的密钥生成部分采用高斯抽样算法,解密部分采用同态加密实现密文间的全同态运算.设计的全同态掩码方案电路模型中,根据算法功能分为数据采样区、存储区及运算区.本方案通过高斯取样生成密钥,能防范格攻击;通过密文之间的同态运算,可以实现多项式所有系数同时掩码;通过分析算法的同态性,验证了本方案的正确性;通过分析方案的实现过程,论证了该方案能够有效防御选择密文攻击、差分能量攻击、零值攻击及相关能量攻击.展开更多
摘要A novel broadcast encryption scheme for group communication scenarios in distributed networks is presented. In the scheme, anyone is allowed to encrypt a message and distribute it to a designated group. Each member in the designated group has the ability to independently decrypt a ciphertext. In contrast to traditional broadcast encryption, all the valid receivers in the proposed scheme compose the designated group. To take advantage of this property, a tab for the group is set and the matching private key for each member is generated. In addition, before decrypting a ciphertext, anyone in the scheme can verify the ciphertext, to ensure that the ciphertext is correct. This property is very important for large-scale group communication, as the gateway can filter incorrect ciphertext and alleviate the receiver's workload. Finally, a proof in the random oracle model is given, to show that the proposed scheme is secure against the adaptively chosen ciphertext attack.
摘要为了抵抗量子计算机的攻击,相关的后量子密码算法被先后提出.NTRU(Number Theory Research Unit)密码算法是基于格理论的典型算法之一,在NTRU密码方案的硬件设计及实现过程中,主要会面临格攻击、简单能量攻击、差分能量攻击及相关能量攻击等风险.为了解决NTRU算法在实现过程中的侧信道攻击安全隐患,提出一种新的全同态掩码防御方案,并给出电路设计参考模型,所提出方案能够对NTRU算法所有系数执行掩码操作并防范能量攻击.本方案的密钥生成部分采用高斯抽样算法,解密部分采用同态加密实现密文间的全同态运算.设计的全同态掩码方案电路模型中,根据算法功能分为数据采样区、存储区及运算区.本方案通过高斯取样生成密钥,能防范格攻击;通过密文之间的同态运算,可以实现多项式所有系数同时掩码;通过分析算法的同态性,验证了本方案的正确性;通过分析方案的实现过程,论证了该方案能够有效防御选择密文攻击、差分能量攻击、零值攻击及相关能量攻击.