bit AES encryption with CBC

I've read the following threads and they've helped a little, but I'm looking for a little more info. How to write AES/CBC/PKCS5Padding encryption and decryption with Initialization Vector Parameter for BlackBerry Java 256bit AES Encryption Basically, what I am doing is writing a program that will encrypt a request to be sent over TCP/IP, and then decrypted by a server program.

用CBC进行AES加密

我已阅读以下主题,他们已经帮助了一些,但我正在寻找更多信息。 如何使用BlackBerry的初始化向量参数编写AES / CBC / PKCS5Padding加密和解密 Java 256位AES加密 基本上,我正在做的是编写一个程序来加密要通过TCP / IP发送的请求,然后通过服务器程序进行解密。 加密将需要AES,并做了一些研究,我发现我需要使用CBC和PKCS5Padding。 所以基本上我需要一个密钥和一个IV。 我正在开发的应用程序是用于手机的,所以我

Based Encryption

I need to implement 256 bit AES encryption, but all the examples I have found online use a "KeyGenerator" to generate a 256 bit key, but I would like to use my own passkey. How can I create my own key? I have tried padding it out to 256 bits, but then I get an error saying that the key is too long. I do have the unlimited jurisdiction patch installed, so thats not the problem :) Ie

基于加密

我需要实现256位AES加密,但我在网上找到的所有示例都使用“KeyGenerator”生成256位密钥,但我想使用自己的密钥。 我如何创建自己的密钥? 我试过把它填充到256位,但后来我得到一个错误,说密钥太长。 我确实已经安装了无限的权限修补程序,所以这不是问题:) IE浏览器。 KeyGenerator看起来像这样... // Get the KeyGenerator KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128); // 192 and 256 bits

Destroy SessionScoped CDI beans during Shiro logout

The problem is that the session scoped beans are not destroyed before the session-timeout is reached. Therefore I have two questions regarding the following logout procedure: Is this the right way to use shiro logout (see logout() below) What would be the proper way to destroy the CDI session-scoped beans during logout. page.xhtml: <p:commandLink ajax="false" actionListener="#{myOther

在Shiro注销期间销毁SessionScoped CDI bean

问题是会话作用域bean在达到会话超时之前不会被销毁。 因此,我有两个有关以下注销程序的问题: 这是使用shiro注销的正确方法(请参阅下面的注销()) 在注销期间销毁CDI会话范围的bean的正确方法是什么? page.xhtml: <p:commandLink ajax="false" actionListener="#{myOtherBean.logout}" /> 豆: @Named @SessionScoped public class mySessionBean implements Serializable { } @Named @SessionScoped p

How I can create new user from Java class to GlassFish?

I'm creating a basic web application where user can register and then login. Obviously there is registration, login and login error page. I'm using GlassFish server for authentication. I would like to know that is there any possible way to create a new user from Java class or Servlet so that when user is created, it will be saved to 'file' Realm of GlassFish? To be more speci

我如何从Java类创建新用户到GlassFish?

我正在创建一个基本的Web应用程序,用户可以注册并登录。 显然有注册,登录和登录错误页面。 我正在使用GlassFish服务器进行身份验证。 我想知道是否有任何可能的方式从Java类或Servlet创建新用户,以便在创建用户时将其保存到GlassFish的'file'领域? 更具体的是我想要做的事情: 通过使用已定义的实体类创建用户。 将该用户实体保存到数据库。 使用用户名和密码为GlassFish文件Realm创建新用户。 到目前

Using bcrypt in a Glassfish 3.0 security realm

I'm currently in the process of changing the password handling in a web application from unsalted MD5 to bcrypt. It's a standard JSF application, running on Glassfish 3.0.1. Using jBCrypt made creating and storing the hashes pretty easy. But now I don't know how to use bcrypt in the actual authentication when the user logs in. Since it's JSF, the login is being triggered using

在Glassfish 3.0安全领域使用bcrypt

我目前正在将Web应用程序中的密码处理从未加密的MD5更改为bcrypt。 这是一个标准的JSF应用程序,运行在Glassfish 3.0.1上。 使用jBCrypt使创建和存储哈希变得非常简单。 但是现在我不知道如何在用户登录时在实际身份验证中使用bcrypt。由于是JSF,因此使用HttpServletRequest#登录方法触发登录,其余部分由Java EE堆栈和Glassfish进行处理。 只需将安全领域摘要算法设置为“none”,然后在传递密码之前对密码进行哈希处理,

Making Distinctions Between Different Kinds of JSF Managed

I recently read this article from Neil Griffin Making Distinctions Between Different Kinds of JSF Managed-Beans and it got me thinking about the distinction between different beans in my own application. To quickly summarise the gist: Model Managed-Bean: This type of managed-bean participates in the "Model" concern of the MVC design pattern. When you see the word "model" -

区分不同类型的JSF托管项目

我最近阅读了Neil Griffin的这篇文章,对不同类型的JSF Managed-Beans进行了区分,并让我思考了我自己的应用程序中不同bean之间的区别。 要快速总结这个要点: Model Managed-Bean:这种类型的托管bean参与了MVC设计模式的“Model”关注。 当你看到“模型”这个词 - 想想DATA。 JSF模型bean应该是一个遵循JavaBean设计模式的POJO,使用getter / setter封装属性。 备份Managed-Bean:这种类型的托管bean参与了MVC设计模式的“Vi

Best way to compute a truncated singular value decomposition in java

I want to benchmark the best 2 or 3 libraries to compute a truncated singular value decomposition (SVD), ie an SVD where only the k largest singular values are kept. Moreover, I have those constraints : It has to be a java library My matrices are sparse (around 1% non zero values) My matrices are quite big (typically 10k x 5k) My matrices can also be larger than high (5k x 10k) I'v

在java中计算截断奇异值分解的最佳方法

我想基准最好的2或3个库来计算截断奇异值分解(SVD),即只保留k个最大奇异值的SVD。 而且,我有这些限制: 它必须是一个Java库 我的矩阵很稀疏(大约1%的非零值) 我的矩阵非常大(通常为10k x 5k) 我的矩阵也可以大于高(5k x 10k) 我遇到了相当多的库,但是例如在Colt中,我甚至不知道SVD算法是否考虑到我的矩阵很稀疏的事实。 另外,我没有找到能够直接计算截断解决方案的单个库(这应该快得多)。 实际上,

Large Sparse Matrix Eigendecomposition in JAVA

I am looking for a linear algebra library in Java which can handle large "sparse" matrices of size (say 1 million by 1 million) and perform decompositions like SVD,LU on the matrices. I looked around and tried COLT, however it can only handle matrices upto a fixed number of elements. EJML site also mentions that it won't be able to handle this. (http://code.google.com/p/efficie

JAVA中的大型稀疏矩阵特征分解

我正在寻找一个Java中的线性代数库,它可以处理规​​模较大的“稀疏”矩阵(比如说100万),并在矩阵上执行SVD,LU等分解。 我环顾四周,尝试了COLT,但它只能处理矩阵达到固定数量的元素。 EJML网站也提到它将无法处理这个问题。 (http://code.google.com/p/efficient-java-matrix-library/wiki/FAQ) 我知道在C ++中有可以处理这种大小的数据的软件包,但是我不能从Java移动,因为我拥有围绕Java构建的所有其他代码。

Colored Pixels Appearing When Trying to Compress Image (pics included)

I'm trying to compress a given image using Singular Value Decomposition. I thought I had it, until I noticed that I keep getting garbage colored pixels appearing throughout the process. The number shown at the top right shows the number of iterations where 0 is the original image. Is this a common error? Is there something I'm missing? I figure it may have to do with my math, itse

试图压缩图像时出现彩色像素(包括图片)

我试图使用奇异值分解压缩给定的图像。 我想我已经拥有了它,直到我注意到我在整个过程中不断出现垃圾颜色的像素。 右上角显示的数字显示了0是原始图像的迭代次数。 这是一个常见的错误? 有什么我失踪? 我认为这可能与我的数学本身有关。 我正在使用JAMA,这是一个为我处理这个问题的java矩阵包。 以下是我对每个迭代的实现: for (int i = 0; i < k; i++) { Matrix step = (uColumns[i].times(sValues[i

How do we decide the number of dimensions for Latent semantic analysis ?

I have been working on latent semantic analysis lately. I have implemented it in java by making use of the Jama package. Here is the code: Matrix vtranspose ; a = new Matrix(termdoc); termdoc = a.getArray(); a = a.transpose() ; SingularValueDecomposition sv =new SingularValueDecomposition(a) ; u = sv.getU(); v = sv.getV(); s = sv.getS(); vtranspose =

我们如何确定潜在语义分析的维数?

最近我一直在研究潜在的语义分析。 我通过使用Jama软件包在java中实现了它。 代码如下: Matrix vtranspose ; a = new Matrix(termdoc); termdoc = a.getArray(); a = a.transpose() ; SingularValueDecomposition sv =new SingularValueDecomposition(a) ; u = sv.getU(); v = sv.getV(); s = sv.getS(); vtranspose = v.transpose() ; // we obtain this as a result of svd