算术运算实现字母的替换。凯撒加密就是一种单字母替换法：通过用户给出密钥将字母加上密码变成密文...

这是最新的openssl学习的材料，是源代码，相信朋友们以前看过的都知道，这在网络方面很有用的。-This is the latest openssl learning opnenssl, is the source code, I believe that friends who have seen before, all know that this very useful in networking.

写专属或加密程序。 程序应该采取作为输入由程序然后加密的文件名。 程序应该要求用户输入密钥，应该用于加密文件。 程序的输出应该进入一个文件以同一个文件名，但.ENC引伸。-Write an exclusive-OR encryption program. The program should take as input a filename that is then encrypted by the program. The program should ask the user to input an encryption key, which should be used to encrypt the file. The output of the program should go into a file with the same filename but a .ENC extension.

实现维吉尼亚密码，用键盘接收明文和密钥，屏幕打印密文。-The achievement of Virginia password, use the keyboard to receive explicit and key, screen printing ciphertext.

VHDL implementation of the twofish cipher for 128,192 and 256 bit keys. The implementation is in library-like form All needed components up to, including the round/key schedule circuits are implemented, giving the flexibility to be combined in different architectures (iterative, rolled out/pipelined etc). Manual in English is included with more details about how to use the components and/or how to optimize some of them. All testbenches are provided (tables, variable key/text, ECB/CBC monte carlo) for 128, 192 and 256 bit key sizes, along with their respective vector files.-VHDL implementation of the twofish cipher for 128,192 and 256 bit keys. The implementation is in library-like form All needed components up to, including the round/key schedule circuits are implemented, giving the flexibility to be combined in different architectures (iterative, rolled out/pipelined etc). Manual in English is included with more details about how to use the components and/or how to optimize some

如何实现DES算法-how DES algorithm

Rijndael algorithm修正了CBC下BUG的版本(有源代码）工作在：D5。作者：Sergey Kirichenko。--Rijndael algorithm that has revised BUG version under CBC(with source code).It works in D5. author:Sergey Kirichenko。

椭圆曲线公钥密码算法,可用于加密和数字签名等应用，该版本算法是有限域GF（2^n）上的算法-Elliptic curve public key cryptography algorithms can be used for encryption and digital signature applications, the version of the algorithm is a finite field GF (2 ^ n) the algorithm

栅格加密法,IDE vc6,方法比较简单,适合初学者理解-Lattice

产生共享软件加密序列号的程序- Has the shareware encryption sequence number procedure

有密码的加壳源码.只是简单的介绍下壳方法.牛人见笑了-Has the password Canadian shell source code