aes | 易学教程

Breaking AES encryption using decrypted data

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问题 After a discussion about encryption, a friend of mine challenged me to crack a file he encrypted using AES with a 128bit key. I know the file was originally a GIF image, so it should start with 'GIF8'. I'm wondering if it is possible to derive the password from this knowledge in a reasonable time (ie. a week or less). Stealing the key in any way other than analyzing the encrypted file is not possible, as it defeats the point of the challenge. If so, pointers would be welcome. I failed to find

Decrypt file in Node.js encrypted using OpenSSL

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问题 I'm using the following command to encrypt a video file in openssl openssl aes-256-cbc -nosalt -a -in movie.mp4 -out movie.enc -k skdjfsldkfjsldkjfsldkf And using the following code to decrypt the file but I keep getting bad decrypt error what am I doing wrong? var crypto = require('crypto'); var fs = require('fs'); cipher_name = 'aes-256-cbc'; password = 'skdjfsldkfjsldkjfsldkf'; decoder = crypto.createDecipher( cipher_name, password ); text_crypt = fs.readFileSync( 'movie.enc' ); chunks = [

AES encryption using C# and decryption in Java

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问题 I just want to confirm my understanding of how AES works. If company#1 is encrypting the data, and sending this data to company#2 to decrypt, and let's presume that one of them uses C# and the other Java. As long as both are using the same shared secret key, is there anything else setting/configuration wise both parties should agree upon to make sure the data is correctly encryption and decrypted? 回答1: There is a lot that both have to agree upon: shared secret key How long is it? (Is key

How to convert SecByteBlock to string?

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问题 I'm having a problem trying to convert SecByteBlock to string. Here's my case: I want to encrypt user access data using AES with static key and dynamic iv. My code is something like this: AesKeyIvFactory aesKeyIvFactory; SecByteBlock key = aesKeyIvFactory.loadKey(); SecByteBlock iv = aesKeyIvFactory.createIv(); encryptionService->encode(&userAccess, key, iv); std::string token = std::string(iv.begin(), iv.end()) + userAccess; The code above is supposed to: Load key from file; Create iv;

AES-256 encryption in PHP

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问题 I need a PHP function, AES256_encode($dataToEcrypt) to encrypt the $data into AES-256 and another one AES256_decode($encryptedData) do the opposite. Does anyone know what code should this functions have? 回答1: Look at the mcrypt module AES-Rijndael example taken from here $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); $iv = mcrypt_create_iv($iv_size, MCRYPT_DEV_URANDOM); $key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3"); # show key size

忘记密码流程——UUID，AES

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忘记密码流程 1.进入忘记密码页面 2. 后台检验参数合法性（null，验证码，邮箱合法性） 3，生成更新密码链接，并将相关参数写入DB 　　link=urlBase（baseurl）+updatePassword？pwdid（相关参数在db中的id）&uuid（存于db中，用于步骤6检验外来链接的合法性） 4，发送邮件给客户 5. 客户点击邮件中的更新链接 6. 更新前参数的检验（status=1失效，status=2超过24小） 7，设置相关参数到更新页面（newpwd，repwd）；其中用到的知识点：uuid，Aes加密 UUID是指在一台机器上生成的数字，它保证对在同一时空中的所有机器都是唯一的。使用UUID的好处在分布式的软件系统中（比如：DCE/RPC, COM+,CORBA）就能体现出来，它能保证每个节点所生成的标识都不会重复 UUID由以下几部分的组合：（1）当前日期和时间，UUID的第一个部分与时间有关，如果你在生成一个UUID之后，过几秒又生成一个UUID，则第一个部分不同，其余相同。（2）时钟序列。（3）全局唯一的IEEE机器识别号，如果有网卡，从网卡MAC地址获得，没有网卡以其他方式获得。 import java.util.UUID; UUID uuid = UUID.randomUUID(); 1.加密：例：加密方式： AES128(CBC

AES后端加密解密数据CBC模式

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AES后端加密解密数据CBC模式今天项目有用到加密登陆密码，实际业务是前端加密，后端解密，主要使用的是AES进行解密主要maven依赖 < dependency > < groupId > commons - codec < / groupId > < artifactId > commons - codec < / artifactId > < version > 1.10 < / version > < / dependency > < dependency > < groupId > org . apache . commons < / groupId > < artifactId > commons - lang3 < / artifactId > < version > 3.4 < / version > < / dependency > 上代码 public class AESUtil { //密钥 (需要前端和后端保持一致)要求16位 private static final String KEY = "12345678910abcde" ; //偏移量(CBC模式需要,需要前端和后端保持一致)要求16位 private static final String IV = "12345678910abcde" ; //具体算法/加密模式/补码方式 private

AES 加密算法的原理详解

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AES简介高级加密标准(AES,Advanced Encryption Standard)为最常见的对称加密算法(微信小程序加密传输就是用这个加密算法的)。对称加密算法也就是加密和解密用相同的密钥，具体的加密流程如下图：下面简单介绍下各个部分的作用与意义：明文P 没有经过加密的数据。密钥K 用来加密明文的密码，在对称加密算法中，加密与解密的密钥是相同的。密钥为接收方与发送方协商产生，但不可以直接在网络上传输，否则会导致密钥泄漏，通常是通过非对称加密算法加密密钥，然后再通过网络传输给对方，或者直接面对面商量密钥。密钥是绝对不可以泄漏的，否则会被攻击者还原密文，窃取机密数据。 AES加密函数设AES加密函数为E，则 C = E(K, P),其中P为明文，K为密钥，C为密文。也就是说，把明文P和密钥K作为加密函数的参数输入，则加密函数E会输出密文C。密文C 经加密函数处理后的数据 AES解密函数设AES解密函数为D，则 P = D(K, C),其中C为密文，K为密钥，P为明文。也就是说，把密文C和密钥K作为解密函数的参数输入，则解密函数会输出明文P。在这里简单介绍下对称加密算法与非对称加密算法的区别。对称加密算法加密和解密用到的密钥是相同的，这种加密方式加密速度非常快，适合经常发送数据的场合。缺点是密钥的传输比较麻烦。非对称加密算法加密和解密用的密钥是不同的

Testing of AES algorithm implementation in C [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I've downloaded the code from this site, compiled it and now trying to test it I got a few problems... I generated two files from compilation encrypt and decrypt and instructions from the site are: The encryption program is called as follows: encrypt password cryptofile It encrypts the standard input (padding it

How to use diffie Hellman Sessionkey as password for AES Encryption

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问题 I need to create a server and client in c++ which exchange Diffie Hellman public key and encryption with AES_256 so far I am using MSDN sample for DH public key Generatinghttps://docs.microsoft.com/en-us/windows/win32/seccrypto/diffie-hellman-keys and its fine with RC4 in both side (client and server) but after Converting sample to AES_256 I get error 0x80090005(NET_BAD_DATA) on client-side EncryptDecrypt API.strange part is if both client and server runs on the same machine (not the same OS)

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