查询词典 substitution cipher

Chapter 2 clarifies the cryptographical foundation, which includes the symmetrical cipher technology, unsymmetrical cipher technology and digital envelope .

包括对称密码技术，非对称密码技术和数字信封技术，并详细分析了DES算法和RSA算法。

In essence, stream cipher is such a pseudorandom generator that its chaos sequence of output and random sequence are computational indistinguishability; and the aim in designing block cipher materially is to design a pseudorandom permutation which is computationally indistinguishable from random permutations.

实际上，序列密码本质上就是一个伪随机生成器G，其输出的乱数序列和随机序列是计算不可分辨的；而分组密码的设计目标实质上就是设计一个伪随机置换，它与随机置换是计算不可分辨的。

The S box was constituted with the multiplication inverse element affined transformation in GF(2) of all elements of limited field GF(28),with S box s nonlinear byte changed,ciphered text attained the ideal status of the even of difference and the linear of deviation,and increased the capability of the AES algorithm of anti beating the difference cipher of analysis and linear cipher of analysis.

S盒由有限域G F(28)上所有元素的乘法逆元及在域G F(2)上的仿射变换构成，经过S盒的非线性字节代换，密文的差分均匀性和线性偏差都达到较理想的状态，提高了A E S算法抗击差分密码分析及线性密码分析的能力。

The diffusion structure has important impact on the rate of the diffusion and safety intensity for block cipher.Using the linear transform which has branch numbers as large as possible as the diffusion structure is a main method to devise block cipher.The linear transform is usually achieved by constructing the invertible matrix.

扩散结构的好坏直接影响了分组密码的扩散速度和安全强度，以分支数尽可能大的线性变换为分组密码算法的扩散结构是设计分组密码的一种重要方法，线性变换的构造可通过可逆矩阵的构造完成。

When operating a cipher in CBC mode, the plain text must be padded to the cipher's block size in an unambiguous manner so that the padding can later be removed.

当经营CBC模式密码，纯文本必须填充到密码的块大小可以很清楚地让填充以后可以删除。

This invention discloses a safety authenticating method for PC customer end including PC customer end presents registration request to a service via ID number and cipher, the server makes the first authentication based on customer ID number and the cipher to generate a field of reauthentication if it's passed to be fed back to PC customer end along with the finished authentication message; when PC customer end makes calls, it will send ID number and field of reauthentication during registration to media gate controller which transfer the ID number field of reauthentication to be server for second time authentication and refuse the calling if it's not passed, or receive the calling and feeding back the called information.

要约 本发明公开了一种PC客户端的安全认证方法，包括：PC客户端通过用户ID号码和密码，向服务器发起登录请求；服务器根据用户ID号码和密码进行第一次认证，若认证通过，生成一个用于再次认证的字段，并随认证通过消息返回给PC客户端；当PC客户端发起呼叫时，将用户ID号码和登录时获得的再次认证的字段一起传送给媒体网关控制器；媒体网关控制器将该用户ID号码、再次认证的字段一起传送给服务器进行第二次的认证，若认证没有通过，则拒绝呼叫，否则接受呼叫返回被叫信息。

Through deducing the representation of the nonlinearity part of the symmetric cipher in Boolean function, the equivalence between symmetric cipher design and Boolean function is verified.

通过推导分组密码的非线性部分的布尔函数表达式，验证了对称加密设计与布尔函数构造之间的等价关系。

Stream cipher trivium design manual and C source code contains a stream cipher design principles and security analysis.

详细说明：流密码算法trivium的设计手册和C源代码，包含了流密码的设计原则和安全性分析。

The Cipher Card can realize fast communication with host, and has fast cryptological operation ability, and offers update ability for arithmetic and hardware structure. The Cipher Card supports dispersed storage and online reconfiguration for arithmetics and keys, and offers digital physical noise circuit and can generate veriest random data , and it provides USB host interface to external and supports the mode of safe initialization by itself based on USB carrier ,and supports the method of identity authentication based on USB carrier.

该加密卡可以实现与主机的快速通信，具有快速的密码处理能力，提供密码算法以及硬件结构的更新和升级能力，支持密码算法和密钥的分散存储和现场重构，提供数字物理噪声源，能够产生真随机数，对外提供USB主机接口，支持基于USB密码载体的自身安全初始化方式，支持基于USB物理载体的用户身份认证方法。

No one is impressed if a random person creates an cipher he can't break; but if one of the world's best cryptographers creates an cipher he can't break, now that's worth looking at.

随便一个什么都可能设计一个自己无法破解的密码算法，但没有人会把它放在心上，而假如世界上最好的密码学家之一设计了一个自己无法破解的密码算法，那么它就值得关注了。

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？