于是,我们需要新的安全定义。 确定性CPA安全(Deterministic CPA Security): 如果从来不用相同的密钥加密同一个消息两次,实现CPA安全,即密钥和消息对 是唯一的。 这里引入新的条件:消息是可重复的,密钥也可重复,但同一密钥不能重复加密同一消息。这是为了实现CPA而做出的必要改变。相当于获得确定性下CPA安全的同时,丧...
Chosen ciphertext securityTrapdoor functionsKey-dependent-message securityJournal of Cryptology - We study the relationship among public-key encryption (PKE) satisfying indistinguishability against chosen plaintext attacks (IND-CPA security), that against chosen......
We discuss IND-CCA security for public key encryption.这是一系列博客文章中的最新一篇,旨在解决“每个博士生都应该知道的52件事”做密码学:这是一组问题,旨在让博士生在第一年结束时了解他们应该知道什么。我们讨论了公钥加密的IND-CCA安全性。IND-CCA security stands for Indistinguishable Chosen Ciphertext ...
KEM-IND-CCASecurity.We say a KEM\(\mathsf {KEM}\)is KEM-IND-CCA-secure if and only if any PPT adversary\(A\)has only negligible advantage in the following security experiment. First,\(A\)gets an honestly generated public key\({\mathsf {pk}}\)as well as a ciphertext-key pair\((...
Nevertheless, the ciphertext transformation is expected as a regular functionality in OD-ABE, which makes the definition of CCA security tricky. In this paper, to fill the gap between the security requirement of fog computing and the security of OD-ABE, we will propose the CCA security for ...
This subject investigates the discrete logarithm problem over finite field CF(pn),proposes a ElGamal encryption scheme over finite field CF(pn),and proves that proposed the scheme satisfies IND-CCA security without oracle model.Futhermore,the size of algorithm's security parameter k is contingent on...
CCA安全证明方法是一种密码学中的概念,全称为“Chosen Ciphertext Attack Security”。它是一种用于衡量加密算法安全性的标准,也是一种用于评估加密算法强度的方法。简单来说,CCA安全证明方法是指在攻击者可以选择密文的情况下,加密算法仍然能够保证安全。 二、CCA安全证明方法的分类 根据加密算法的不同,CCA安全证明方法...
[4] Gertner Y, Malkin T, Myers S, Towards a separation of semantic and CCA security for public key encryption, in: TCC 2007, Vol. 4392 of LNCS, Springer, 2007, pp. 434-455. [5] Gertner Y, Malkin T, Myers S, Towards a separation of semantic and CCA security for public key encr...
KDM[F]-CCA security of public-key encryption (PKE) ensures the privacy of key-dependent messages f(sk) which are closely related to the secret key sk, where f∈F, even if the adversary is allowed to make decryption queries. In this paper, we study the design of KDM-CCA secure PKE. ...
In a practical system, a message is often encrypted more than once by different encryptions, here called multiple encryption, to enhance its security. Additionally, new features may be achieved by multiple en- crypting a message, such as the key-insulated cryptosystems and anony- mous channels....