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信息安全-加密：DES 加密

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ylbtech-信息安全-加密：DES 加密 DES全称为Data Encryption Standard，即数据加密标准，是一种使用密钥加密的块算法，1977年被美国联邦政府的国家标准局确定为联邦资料处理标准（FIPS），并授权在非密级政府通信中使用，随后该算法在国际上广泛流传开来。需要注意的是，在某些文献中，作为算法的DES称为数据加密算法（Data Encryption Algorithm,DEA），已与作为标准的DES区分开来。 1. 返回顶部 2. 返回顶部 3. 返回顶部 4. 返回顶部 5. 返回顶部 1、 https://baike.baidu.com/item/DES 2、 6. 返回顶部作者： ylbtech 出处： http://ylbtech.cnblogs.com/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。来源： https://www.cnblogs.com/storebook/p/10724378.html

CryptoJS DES加密

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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Testing websockets</title> <script type="text/javascript" src="jquery-1.10.1.js"></script> <script src="tripledes.js"></script> <script src="mode-ecb-min.js"></script> <script type="text/javascript"> var key = 'BOTWAVEE'; //CBC模式加密 function encryptByDESModeCBC(message) { var keyHex = CryptoJS.enc.Utf8.parse(key); var ivHex = CryptoJS.enc.Utf8.parse(key); encrypted = CryptoJS.DES.encrypt(message, keyHex, { iv:ivHex, mode: CryptoJS.mode.CBC, padding:CryptoJS.pad.Pkcs7 }

How to encrypt an NSString in Objective C with DES in ECB-Mode?

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I am trying to encrypt an NSString in Objective C on the iPhone. At least I wan't to get a string like "TmsbDaNG64lI8wC6NLhXOGvfu2IjLGuEwc0CzoSHnrs=" when I encode "us=foo;pw=bar;pwAlg=false;" by using this key: "testtest". My problem for now is, that CCCrypt always returns "4300 - Parameter error" and I have no more idea why. This is my code (the result of 5 hours google and try'n'error): NSString *token = @"us=foo;pw=bar;pwAlg=false;"; NSString *key = @"testtest"; const void *vplainText; size_t plainTextBufferSize; plainTextBufferSize = [token length]; vplainText = (const void *) [token

C# Decrypt bytes from SQL Server EncryptByPassPhrase?

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Following Replicate T-SQL DecryptByPassPhrase in C# , I am unable to get a simple encryption with MSSQL to descrypt in C#. The encrypted values in certain columns is necessary because the table is exported into Excel and Access on a regular basis so simple encryption is more than enough to "block" values without having to involve developers to (re)do views, etc. In SQL Server 2012: select EncryptByPassPhrase( N'hello' , N'world' ) -- returns 0x01000000AA959FFB3A8E4B06B734051437E198C8B72000A058ACE91D617123DA102287EB In C#: byte[] buf = System.Text.Encoding.UTF8.GetBytes(

DES Initialization Vector in C#

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I am trying to decrypt (using the DES algorithm) data that comes from a third party in C# code. There are plenty of examples here and elsewhere that have helped me out. The problem is that I don't know what to use for the 'initialization vector'. The third party supplied a tool for use on the command line (DES.EXE, which I believe is an out-of-the-box build of the libdes library v4.01) which only requires that you supply an encryption key. So, I can decrypt fine with the tool. However, I would rather not spawn a process to run the tool from my code. My question is how do I generate/find that

基于RSA和DES双重加密的可靠通信

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我们用比较经典的银行和用户的消息传输来讲解RSA和DES在建立可靠通信的作用，首先，我们知道非对称性加密有两个Key，一个是公钥Public Key，一个是私钥Private Key，私钥通常具有唯一性，而且不向外公开，而公钥可以向外公布，这种加密系统适合于C/S框架，用私钥加密的密文只能通过公钥解密，反之亦然，在我们的例子里，银行持有私钥而每个用户可以通过可靠机关获得公钥。至于非对称加密的好处我们可以想象下，用户A需要登陆银行系统，于是使用公钥加密自己的用户名登陆密码发送给银行，就算C截获了A的密文，但是C只有公钥，无法解密密文。非对称加密保证了所有用户发送给银行的消息只有银行本身可以知道内容。而银行发送登陆成功的提示给A，就算C截获了并且用public key解密了密文，但是很明显这些信息的重要性很低。我们可以设想一下，用户A的登陆，对账户进行操作（例如C最想的转账），查阅等操作都是由A发送的，而银行发回来的基本是对操作的确认，提示之类。由此我们可以知道非对称加密非常适合这种应用场景。但是为什么还需要在通信中加入对称加密呢？我们设想下，如果A发送登陆信息给银行而被C截获了，就算C无法解密该密文，但是只要C从本机模拟一次发送则可以让银行认为C就是用户A，从而让C登陆A的账户，对A的账户进行转账的操作。于是我们可以设想下用下面的办法来解决该问题： //1

BitShifting with BigIntegers in Java

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I am implementing DES Encryption in Java with use of BigIntegers. I am left shifting binary keys with Java BigIntegers by doing the BigInteger.leftShift(int n) method. Key of N (Kn) is dependent on the result of the shift of Kn-1. The problem I am getting is that I am printing out the results after each key is generated and the shifting is not the expected out put. The key is split in 2 Cn and Dn (left and right respectively). I am specifically attempting this: "To do a left shift, move each bit one place to the left, except for the first bit, which is cycled to the end of the block. " It

Converting Key to String and back to Key Java

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so I'm trying to convert a Key into a string so I can display it with System.out, and then I want to convert it back to a Key. I am able to convert it to a string with BASE64Encoder, but I'm having problems converting it back. Here is my source code: public class Encryption extends Applet { Key keyOrig; BASE64Decoder decoder = new BASE64Decoder(); BASE64Encoder encoder = new BASE64Encoder(); public void init() { try { keyOrig = generateKey(); String keyString = encoder.encode(keyOrig.getEncoded()); System.out.println("Key: "+keyString); Key key = new SecretKeySpec(keyString.getBytes(),0

setAttribute与nodeValue的区别

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今天学习到了这两个方法。但他们的用法还有一点不太熟悉，回头看突然觉得好像有点像，都是获取到了属性之后进行更改，但其中的区别我不太清楚。希望各位能给出意见 1.setAttribute是设置属性值和属性值用的。 2.nodeValue是获取标记。是不是setAttribute必须搭配getAttribute用呢？？ setAttribute var boss = document . getElementById ( "boss" ) ; alter ( boss . getAttribute ( "title" ) ) ; boss . setAttribute ( "title" , "a list" ) ; alter ( boss . getAttribute ( "title" ) ) ; nodeValue var des = document . getElementById ( "des" ) ; alter ( des . firstchild . nodeValue ) ; 来源： https://blog.csdn.net/weixin_43994512/article/details/100176908

Converted secret key into bytes, how to convert it back to secrect key?

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问题 I convert the secretkey into bytes with following code SecretKey key = KeyGenerator.getInstance("DES").generateKey(); byte[] bkey=key.getEncoded(); Now how do I get the key from bkey ? I tried: SecretKeySpec secretkey = new SecretKeySpec(bkey,"DES"); SecretKeyFactory sfkey = SecretKeyFactory.getInstance("DES"); SecretKey skey = sfkey.generateSecret(secretkey); I get the following error: Error during Exception java.security.spec.InvalidKeySpecException: Inappropriate key specification 回答1:

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