For leakage-resilient ciphertext-policy attribute-based encryption （CP-ABE） at present, the size of the ciphertexts in most of them relies on the number of attributes. How to overcome this shortcoming is a challenge...For leakage-resilient ciphertext-policy attribute-based encryption （CP-ABE） at present, the size of the ciphertexts in most of them relies on the number of attributes. How to overcome this shortcoming is a challenge problem. Based on the Goldreich-Levin theorem and dual system encryption, an efficient CP-ABE scheme with constant size ciphertexts is proposed in this paper. It can tolerate leakage on master secret key and attribute-based secret keys with auxiliary inputs. Furthermore, the proposed scheme can be realized as resilience against continual leakage if keys are periodically updated. Under some static assumptions instead of other strong assumptions, the introduced scheme achieves adaptively security in the standard model.展开更多
Attribute-based broadcast encryption(ABBE) under continual auxiliary leakage-resilient(CALR) model can enhance the security of the shared data in broadcasting system since CALR model brings the possibility of new leak...Attribute-based broadcast encryption(ABBE) under continual auxiliary leakage-resilient(CALR) model can enhance the security of the shared data in broadcasting system since CALR model brings the possibility of new leakage-resilient(LR) guarantees. However, there are many shortcomings in the existing works, such as relying on the strong assumptions, low computational efficiency and large size of ciphertexts, etc. How to solve the trade-off between security and efficiency is a challenging problem at present. To solve these problems, this paper gives an ABBE scheme resisting continual auxiliary leakage(CAL) attack. ABBE scheme achieves constant size ciphertexts, and the computational complexity of decryption only depends on the number of receivers instead of the maximum number of receivers of the system. Additionally, it achieves adaptive security in the standard model where the security is reduced to the general subgroup decision(GSD) assumptions(or called static assumptions in the subgroup). Furthermore, it can tolerate leakage on the master secret key and private key with continual auxiliary inputs. Performance analysis shows that the proposed scheme is more efficient and practical than the available schemes.展开更多
由于目前云存储的访问控制策略中密文与密钥长度过大,引发存储与通信代价过高,并且针对用户权限撤销需要频繁地重新加密对称密钥或者重新加密原始数据,导致系统安全性差、效率低下的问题,提出了一种安全可靠的,基于CP-ABE(ciphertext-po...由于目前云存储的访问控制策略中密文与密钥长度过大,引发存储与通信代价过高,并且针对用户权限撤销需要频繁地重新加密对称密钥或者重新加密原始数据,导致系统安全性差、效率低下的问题,提出了一种安全可靠的,基于CP-ABE(ciphertext-policy attribute based encryption)的访问控制方案。该方案不仅可以固定密文与密钥的长度,具有较高的计算效率,而且支持用户权限的撤销功能,并且在密钥与密文传送的过程中使用了签名机制,防止传输过程遭受破坏。通过理论与实验证明,该方案可以抵抗选择密文攻击、合谋攻击等常见的攻击。与现有的方案相比,该方案具有较高的计算效率,并且更容易实现。展开更多
基金supported in part by the Nature Science Foundation of China (61472307, 61402112, 61100165, 61100231)Natural Science Basic Research Plan in Shaanxi Province of China (2016JM6004)
文摘For leakage-resilient ciphertext-policy attribute-based encryption （CP-ABE） at present, the size of the ciphertexts in most of them relies on the number of attributes. How to overcome this shortcoming is a challenge problem. Based on the Goldreich-Levin theorem and dual system encryption, an efficient CP-ABE scheme with constant size ciphertexts is proposed in this paper. It can tolerate leakage on master secret key and attribute-based secret keys with auxiliary inputs. Furthermore, the proposed scheme can be realized as resilience against continual leakage if keys are periodically updated. Under some static assumptions instead of other strong assumptions, the introduced scheme achieves adaptively security in the standard model.
基金supported by the National Cryptography Development Fund ( MMJJ20180209)。
文摘Attribute-based broadcast encryption(ABBE) under continual auxiliary leakage-resilient(CALR) model can enhance the security of the shared data in broadcasting system since CALR model brings the possibility of new leakage-resilient(LR) guarantees. However, there are many shortcomings in the existing works, such as relying on the strong assumptions, low computational efficiency and large size of ciphertexts, etc. How to solve the trade-off between security and efficiency is a challenging problem at present. To solve these problems, this paper gives an ABBE scheme resisting continual auxiliary leakage(CAL) attack. ABBE scheme achieves constant size ciphertexts, and the computational complexity of decryption only depends on the number of receivers instead of the maximum number of receivers of the system. Additionally, it achieves adaptive security in the standard model where the security is reduced to the general subgroup decision(GSD) assumptions(or called static assumptions in the subgroup). Furthermore, it can tolerate leakage on the master secret key and private key with continual auxiliary inputs. Performance analysis shows that the proposed scheme is more efficient and practical than the available schemes.
文摘由于目前云存储的访问控制策略中密文与密钥长度过大,引发存储与通信代价过高,并且针对用户权限撤销需要频繁地重新加密对称密钥或者重新加密原始数据,导致系统安全性差、效率低下的问题,提出了一种安全可靠的,基于CP-ABE(ciphertext-policy attribute based encryption)的访问控制方案。该方案不仅可以固定密文与密钥的长度,具有较高的计算效率,而且支持用户权限的撤销功能,并且在密钥与密文传送的过程中使用了签名机制,防止传输过程遭受破坏。通过理论与实验证明,该方案可以抵抗选择密文攻击、合谋攻击等常见的攻击。与现有的方案相比,该方案具有较高的计算效率,并且更容易实现。
