Cryptography Programming

In this folder you will find the following files: - tempdes.c : is a sample code for encrypting / decrypting using DES - temprsa.c : is a sample code for encrypting / decrypting using RSA - tempsha1.c : is a sample code for digest generation using SHA1 - [login to view URL],[login to view URL],[login to view URL]: are sample plain text files to test your code - [login to view URL],[login to view URL],[login to view URL]: are DES encrypted versions of files [login to view URL],[login to view URL],test3.txt. Key and IV values used are as follows. - Key = 40fedf386da13d57 (Hexadecimal values) - IV = fedcba9876543210 (Hexadecimal values) - [login to view URL]: Brief description of built in functions you are allowed to use. All the c codes can be compiled and executed using the following commands: - In the linux command line, execute "gcc -o tempdes tempdes.c -lcrypto", where tempdes.c is the source code and tempdes is the name of the executable that sill be generated This command will compile your code and generate an executable. - To execute the program you just created (tempdes in our example), in the linux command line write "./tempdes" The notion of cryptography consists of hiding secret information from untrusted peers by mangling messages into unintelligible text that only trusted peers can rearrange. In this project, we will use and compare three different techniques commonly employed to hide or encrypt information: secret key cryptography (DES), public key cryptography (RSA) and message digests (SHA-1). There is a group of built in functions that will help you complete this assignment. These functions are included in Openssl. Openssl is an open source toolkit that implements security protocols such as SSL but also includes a general purpose cryptography library which you will use. Openssl is usually part of most of the recent linux distributions.