double-random-phase-image

用Visual Studio 2003编的文件加密程序，能对文件进行二进制读入，再和密码做异或，保存。版本一-Visual Studio 2003 for use of file encryption program, can read a binary file, and then do XOR and password, save. Version 1.0

为了提高图像加密算法的鲁棒性，提出了一种新的自适应图像加密算法。首先，把任意大小的灰度或彩 色图像分成2 × 2 子块 然后，用左上角子块的像素灰度值和Chebyshev 混沌映射构造与右上角子块等大的矩阵，用该 矩阵对右上角子块进行像素灰度值替换 最后，按顺时针对每个子块进行加密，直到左上角子块加密完毕。该算法不 依赖于图像的大小，而且适用于灰度图像和彩色图像，因而有很强的鲁棒性。同时灰度值扩散机制的引入使得该算 法具有良好的扩散性和扰乱性。(This paper presented a new self-adaptive image encryption algorithm so as to improve its robustness． Under this algorithm， a gray image or color image was divided into 2 × 2 size blocks． A corresponding size of matrix in the top right corner was created by the pixel gray-scale value of the top left corner under Chebyshev mapping． The gray-scale value of the top right corner block was then replaced by the matrix created before． The remaining blocks were encrypted in the same manner in clockwise until the top left corner block was finally encrypted． This algorithm is not restricted to the size of image and it is suitable to gray images and color images， which leads to better robustness． Meanwhile， the introduction of gray-scale value diffusion system equips this algorithm with powerful function of diffusion and disturbance．)

AES候选算法,安全性高于3DES而速度快过DES-candidate for AES, 3DES and safe to speed faster than DES

鉴于单纯设置一个计数器易被查出，通过修改使其不起作用。我们设计的程序可以通过数据文件，软件执行前通过关键字找到计数基数，然后计算和判别，如果在合理范围，则设定新的关键字，将计数基数放在新关键字指定的位置，并执行子程序 则启动自毁程序。

Java实现des算法源代码，供大家参考(Java implementation des algorithm)

vb写的DES源码，复制到Visual Basic 6.0 中即可使用。-vb source code written by DES, copy to the Visual Basic 6.0, can be used.

网上收集的14种hash算法。希望对大家有用。(14 kinds of hash algorithm online collection)

首先对字母进行编号，小写字母a至z编号为1至26，大写字母A至Z分别编号27至52，这样每个字母都有唯一的一个序号，在发送内容时，我们以函数F(X)=X*X+X+1对发送字母的序号进行计算，就会获取个新的序号，对该序号再进行对52取余，该序号即为加密后的要发送字母的序号，这样就能达到加密的作用。(Number first letter lowercase letters a to z No. 1-26, No. 27-52 uppercase letters A to Z, respectively, so each letter has a unique serial number, sending content to the function F (X- ) = X* X+X+1 send letters number is calculated, it will get a new serial number, the serial number and then take the remainder of the 52, the serial number is the serial number of the letters to be sent encrypted, so that we can achieve encryption role.)

permutation image blocks encryption

以前发的那个只实现了SHA-1, 现在补全了, sha-160, sha-224, sha-256, sha-384, sha-512-Previously issued only to realize that the SHA-1, is now a complete, sha-160, sha-224, sha-256, sha-384, sha-512