查询词典 ciphertext

This paper defines a strong security model for multi-recipient signcryption scheme in the random oracle model, which is semantically secure against adaptive chosen-ciphertext insider attack, existentially forgeable chosen-message attack and anonymous chosen-ciphertext insider attack. By analyzing, we point out that Li-Hu-Liu Multi-Recipient Signcryption Scheme is insecure against the adaptive and anonymous chosen-ciphertext insider attacks.

摘要在随机预言模型下定义了一个多接收者签密方案的强安全性模型，该模型满足适应性选择密文内部攻击安全性、选择消息抗存在性伪造和密文匿名安全性；通过分析指出， Li、Hu和Liu等人提出的多接收者签密方案，不具有适应性选择密文内部攻击安全性和密文匿名性，并给出所定义强安全性模型中的攻击方法；随后提出改进方案，该方案在强安全模型中证明是安全的。

If we receive a ciphertext and the MAC over the ciphertext is valid, we presume with very high probability that the message came from our peer and has not been tampered.

如果我们收到密文，并在密陆委会是有效的，我们具有非常高的概率推定该消息来自我们的同行，也没有被篡改。

In the scheme,the signer may generate a ciphertext of signsture for a message by using the own personal key,and transmit the ciphertext to a specified group of verifiers which adoptes threshold scheme.Any tout of nverifiers in the group can share the authoring for message recovery.

在该方案中，签名者利用其个人密钥可以生成信息签名的密文并送给特定的验证组，采用门陷方案的该验证组n位中的t位能共享对信息进行恢复的权力。

Provable Security is a formal method for proving the security of cryptographic schemes, in which the difficulty of breaking a particular scheme is formally related to that of solving a widely believed computational hard problem. Provable security has already become an important theme of theoretical researches in modern cryptography. This dissertation investigates the provable security of public-key encryptions and hybrid encryptions of asymmetric and symmetric encryptions. This includes the various formal security notions and the constructions can be proved to achieve them. Among the constructions, hybrid encryptions are themselves an important way to obtain public-key encryption schemes with chosen ciphertext security. The main results are as follows:(1) The one-wayness of the trapdoor one-way function in NTRU depends on the randomness of the session key, which is different from previous ones. Based on this observation, a new kind of trapdoor one-way function, trapdoor one-way functions with an auxiliary random variable is proposed.

可证明安全性是一种证明密码学方案安全性的形式化方法，它将密码学方案的安全性归约为公认的计算难题，已成为现代密码学领域中理论工作的主线，本文主要研究公钥加密与单双钥混合加密的可证明安全性，这包括它们的各种形式化安全性定义以及达到这些安全性定义的方案构造，而单双钥混合加密本身也是一种构造选择密文安全公钥加密的重要方法，本文得到的主要结果如下：(1)在研究NTRU公钥加密的特殊性基础上，对于公钥加密的陷门单向函数加密模型进行了扩展，提出了具有辅助陷门单向函数的概念，并将其扩展到多元的情况，讨论了可能的密码学用途。

The size of the ciphertext was a constant and independent of the size of the ring.

密文的大小是一个常量，并且与环的大小无关。

If the same block is encrypted twice with the same key, the resulting ciphertext blocks are the same.

如果相同的块加密两次使用相同的密钥，由此产生的密文块是相同的。

This scheme is regarded as one of practical schemes against adaptively chosen ciphertext attacks, but it is absent of rigorous proofs.

该方案被认为是抗适应性选择密文攻击的实用方案之一，但缺乏严格的安全性证明。

"Decryption is the process of converting ciphertext back into its original format, sometimes called plaintext."

反过来，解密则是将密码文件重新转变成其原始文件形式的方法。

If there is an express integrity and the corresponding ciphertext But achieving deciphering function, which is derived encryption keys.

如果有完整的明文和对应的密文可是实现破译功能，即得出加密密钥。

The realization of this procedure des plus decryption functions, each of the 64 encrypted ciphertext, thus achieving all of the in...

本程序的实现des加解密的功能，每次对64位的密文进行加密，从而实现对所有的文件的加解密。

Fostering the concept of multi-culture firmly and mastering the development of advanced culture correctly are conductive to resisting terrorism, separatism of nationalities and ultraism of religion, which is of great academic theoretical, immediate and profound historical si...

牢固树立多元文化的理念和正确把握先进文化的发展方向，有助于在世界范围内自觉地抵制恐怖主义，民族分裂主义和宗教极端主义。不仅具有重大的学术理论意义，而且也具有重大的现实意义和深远的历史意义。

But if anyone walks in the night, he stumbles, because the light is not in him.

11：10 若在黑夜行走，就必碰跌，因为那光不在他里面。