aes

在实际开发中，会遇到两个系统之间传输数据，为了对传输的数据进行保护，需要发送方对接口数据进行加密，接收方对数据解密。 对数据加密，采用RSA+AES双重加密，是数据更加安全。 使用前提： 如果客户端本身存在安全问题，则无法保证数据的安全，如浏览器端JS变量存储了即将传输的用户密码，这个变量被其他非信任脚本或其他方式获取到了， 会导致数据泄露，这种问题并不是加密传输所能处理的。加密传输能保障数据，有一个前提，那就是 对于本地动态生成的变量，就认为是安全的，是认为第三方无法获取的 。 客户端加密过程主要分为以下三个步骤： 1.客户端随机产生AES的密钥；2.对身份证信息（重要信息）进行AES加密；3.通过使用RSA对AES密钥进行公钥加密。 服务端解密过程主要分为以下两个步骤： 1.对加密后的AES密钥进行RSA私钥解密，拿到密钥原文；2.对加密后的重要信息进行AES解密，拿到原始内容。 来源： https://www.cnblogs.com/strong-FE/p/11694655.html

I am trying to encrypt some text messages using mcrypt from php and the cipher Rijndael, but I am not sure about the MCRYPT_MODE_modename (according to PHP's manual these are available "ecb", "cbc", "cfb", "ofb", "nofb" or "stream" but I read there are actually a few more). I have no idea what each one do or how to use them. I read two things, that ECB mode should not be used and MCRYPT_RAND neither. They didn't explain why. For the ECB mode I guess it's because it always generate the same encrypted output for the same plain text (maybe this could be used for an attack), no idea about MCRYPT

Assume two clients are exchanging secure messages back and forth. Must this block be run every time for each message, or can any step(s) be done just once at start: cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, keySpec); output = cipher.doFinal(content); I guess to lend some context- although I don't (yet) understand the internals completely, it is my understanding that for security purposes it's important to change the IV for each message. So I think the answer to this question will depend on whether that step happens under the hood at the doFinal()

I'm going to be implementing a PHP/mySQL setup to store credit card information. It seems like AES_ENCRYPT/AES_DECRYPT is the way to go, but I'm still confused on one point: How do I keep the encryption key secure? Hardwiring it into my PHP scripts (which will live on the same server as the db) seems like a major security hole. What's the "best practice" solution here? You should think long and hard about whether you REALLY need to keep the CC#. If you don't have a great reason, DON'T! Every other week you hear about some company being compromised and CC#'s being stolen. All these companies

As AES in CTR mode is great for random access, lets say I have a data source created with a CipherOutputStream in AES-CTR mode. The library underneath—which is not mine—uses a RandomAccessFile that allows to seek to a specific byte offset in the file. My initial thought would be to use a CipherInputStream with a Cipher initialized with the right parameters, but the API for that doesn't do seeking and states to not support mark and reset . Is there a part of the API that I've missed that can do this for me, should I look into the configuration of CTR's IV/block counter and recreate that with a

I'm trying to set up 128 bit AES encryption, and I'm getting an exception thrown on my Cipher.init: No installed provider supports this key: javax.crypto.spec.SecretKeySpec I'm generating the Key on the client side using the following code: private KeyGenerator kgen; try { kgen = KeyGenerator.getInstance("AES"); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } kgen.init(128); } SecretKey skey = kgen.generateKey(); This key is then passed to the server as a header. it is Base64 encoded using this function: public String secretKeyToString(SecretKey

I have a bash script which uses openssl to encrypt data, and Java code which decrypts the result. Based on my earlier post , I'm now able to enter a password in openssl, and copy the resulting key/iv into Java. This relies on using the -nosalt option in openssl. I'd like to remove that option, and take password/salt/iv from openssl and pass it into a JDK key derivation function. Here's the openssl script I'm using: #!/bin/bash openssl enc -aes-128-cbc -in test -out test.enc -p When I run this, and enter a password, it prints out the following for example. salt=820E005048F1DF74 key