在不使用传统对称密码学结构的情况下,我们可以通过伪随机函数(PRF)和洗牌算法来构建伪随机置换(PRP)。这里,我们将探讨两种实现方式:一种是依赖密钥的洗牌和反洗牌算法,另一种是不依赖密钥的洗牌和反洗牌算法。以下是具体步骤和证明。 依赖密钥的洗牌和反洗牌算法 依赖密钥的Fisher-Yates洗牌算法 生成伪随机数列: 使...
对称加密又分为 流加密 (Stream Cipher) 和块加密 (Block Cipher)。前者一个 bit 一个 bit 地加密数据的,后者则把数据分块,一块一块地加密的。之后打算分别以轻量级的 Trivium (流加密) 和Present (块加密) 为例,分别介绍 Stream Cipher 和 Block Cipher。 这篇文章以 PRESENT 为例介绍 Block Cipher。后面...
Astream cipheruses time-varying changes on plaintext data to encrypt a continuous string of binary numbers. As a result, this method of encryption works bit-by-bit, utilising keystreams to generate ciphertext for arbitrary lengths of plain text messages. The cipher combines a key(128/256 bits...
16.Block cipher 分组密码 分组密码是将明文消息编码表示后的数字(简称明文数字)序列,划分成长度为n的组(可看成长度为n的矢量),每组分别在密钥的控制下变换成等长的输出数字(简称密文数字)序列。 17.Block reward 块奖励 块奖励给予已成功散列一个事务块的矿工。块奖励可以是硬币和交易费用的混合,取决于所讨论的...
– RC4: a widely used stream cipher – Problems with WEP’s use of RC4 2 Modes of Operations How to use a block cipher? • Block ciphers encrypt fixed-size blocks – e.g. DES encrypts 64-bit blocks • We need some way to encrypt a message of arbitrary length – e.g. a messa...
1) block cipher 块密码 1. A four-dimensional hyperchaotic system is used to generate stream cipher and the extended cat map is employed to constructblock cipher. 该算法将流密码和块密码相结合,实现视频流的实时加密,克服了现有的多数基于混沌系统的视频加密算法不能抵抗已知明文攻击和密钥空间小的缺点。
1) block cipher 块加密1. It analyzes the block cipher and the stream cipher separately and gives an overview of how they interact each other. 介绍了DVB数字视频广播条件接收系统中通用加扰算法的原理和实现过程,详细分析了块加密和流加密的实现过程及两者的结合,并编写了C程序,通过软件实现了通用加扰...
示例1: getCipher ▲点赞 3▼ importorg.bouncycastle.crypto.modes.OFBBlockCipher;//导入依赖的package包/类@OverrideprotectedStreamCiphergetCipher(){ String method = getMethod(); AESFastEngine engine =newAESFastEngine();switch(method) {caseCIPHER_AES_128_CFB:caseCIPHER_AES_192_CFB:caseCIPHER_AES_...
Encryption technique using stream cipher and block 优质文献 相似文献 参考文献 引证文献Chaotic encryption algorithm based on alternant of stream cipher and block cipher distribution when p2 has a tiny change 10−15; " " represents the Chaotic encryption algorithm based on alternant of stream cipher...
1)block cipher分组密码 1.Partition linear cryptanalysis for block cipher;分组密码的分区线性分析法 2.Study of a kind of hybrid encryption system based on both stream and block ciphers;序列密码和分组密码的混合加密体制研究 英文短句/例句 1.Fault-based Cryptanalysis on Several Block Ciphers;对几种分组...