Principles of Computer Security: CompTIA Security+ and Beyond Lab Manual (Exam SY0-601)

Chapter 5

Cryptography

Lab Exercises

5.01   Symmetric Key Encryption

5.02   Asymmetric Key Encryption

5.03   Hashing

5.04   Diffie-Hellman Key Exchange

Lab Analysis

Key Term Quiz

Cryptography is the practice and science of secure communication and coding techniques. Cryptography provides confidentiality, so that only the sender and the intended recipient of a message understand it. Confidentiality of files at rest means that only users with the proper authorization can see the files in their intended format. Those without proper authorization can still see the files on the hard drive and even open the files in a hex editor (the files are not hidden), but they won’t be able to open the file in the program it was designed to be opened in and ...