Secret key encryption lab

Help me study for my Computer Science class. I’m stuck and don’t understand.

Crypto Lab – Secret-Key Encryption

SEED Labs 1 Crypto Lab – Secret-Key Encryption Copyright c 2006 - 2014 Wenliang Du, Syracuse University. The development of this document is/was funded by three grants from the US National Science Foundation: Awards No. 0231122 and 0618680 from TUES/CCLI and Award No. 1017771 from Trustworthy Computing. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation. A copy of the license can be found at http://www.gnu.org/licenses/fdl.html. 1 Overview The learning objective of this lab is for students to get familiar with the concepts in the secret-key encryption. After finishing the lab, students should be able to gain a first-hand experience on encryption algorithms, encryption modes, paddings, and initial vector (IV). Moreover, students will be able to use tools and write programs to encrypt/decrypt messages. 2 Lab Environment Installing OpenSSL. In this lab, we will use openssl commands and libraries. We have already installed openssl binaries in our VM. It should be noted that if you want to use openssl libraries in your programs, you need to install several other things for the programming environment, including the header files, libraries, manuals, etc. We have already downloaded the necessary files under the directory /home/seed/openssl-1.0.1. To configure and install openssl libraries, go to the openssl-1.0.1 folder and run the following commands. You should read the INSTALL file first: % % % % sudo sudo sudo sudo ./config make make test make install Installing a hex editor. In this lab, we need to be able to view and modify files of binary format. We have installed in our VM a hex editor called GHex.