Block ciphers with long keys are stronger than stream ciphers.
使用长密钥的块密码比流密码更强。
Block ciphers employ substitution boxes (S-boxes) as important components.
S盒是设计分组密码的重要组件。
The general structure of SAFER block ciphers adopts SP network. It's design has some original features.
SAFER系列密码算法的总体结构采用SP网络，它的设计具有其独到的几个特色。
Block ciphers can be used in many cryptographic primitives, such as encryption and message authentication code (MAC).
分组密码广泛应用于各类密码算法，如加密算法和消息认证码(MAC)。
Concerning one class of block ciphers, an Sboxes reorganized algorithm was given, which enriched Sboxes application patterns and improved the security strength.
针对一类分组密码算法，通过将S盒与密钥相关联，给出了S盒重组算法，丰富了S盒的应用模式，有效提高了分组密码的安全强度。
The general structure of SAFER block ciphers adopts SP network. It's design has some original features. In this paper, the design technique of SAFER block cipher is analyzed.
SAFER系列密码算法的总体结构采用SP网络，它的设计具有其独到的几个特色。
SPN is a popular overall structure of block cipher, and the differential cryptanalysis and linear cryptanalysis are the most powerful approaches to attack most symmetric block ciphers.
SPN结构是一种流行的分组密码总体结构；差分和线性分析是攻击分组密码的最强有力的方法。
Part 2 (chapters 4-7) introduces the basic techniques of modern cryptography, including symmetric cryptography (block ciphers, stream ciphers), Hash functions, public-key cryptography technology.
第2部分(第4 ~ 7章)主要介绍现代密码学的基本技术，包括对称密码技术(分组密码、序列密码)、Hash函数、公钥密码技术等。
For the design of a compression function one can either start from scratch and build a function specific for the purpose of hashing or use existing cryptographic building blocks such as block ciphers.
通常设计压缩函数有两种方法：一、利用某些数学工具专为哈希目的而设计一个压缩函数，二、利用现有的密码算法如分组密码来作为压缩函数等。
It implements SSE (SSE simple stream encryption algorithm), the algorithm has characteristics of stream ciphers and block cipher encryption algorithm.
说明：实现了SSE (SSE简单流加密算法)，该算法具有块加密与流密码特性的加密算法。
Three are ciphers that can take input plaintexts of large and varying lengths and will output the ith block of the ciphertext after having processed only the first i blocks of the plaintext.
这些加密都可以对输入数据量很大并且长度可变的明文进行加密，但是只有在明文的前 个分组处理完毕后才输出密文的第 个分组。
Three are ciphers that can take input plaintexts of large and varying lengths and will output the ith block of the ciphertext after having processed only the first i blocks of the plaintext.
这些加密都可以对输入数据量很大并且长度可变的明文进行加密，但是只有在明文的前 个分组处理完毕后才输出密文的第 个分组。
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