CompTIA® Security+™: Study Guide, Fifth Edition

Summary

This chapter focused on the basic elements of cryptography and the PKI implementation. There are three primary methods of encryption:

• Symmetric
• Asymmetric
• Hashing

Symmetric systems require that each end of the connection have the same key. Asymmetric systems use a two-key system. In public key cryptography, the receiver has a private key known only to them; a public key corresponds to it, which they make known to others. The public key can be sent to all other parties; the private key is never divulged. Hashing refers to performing a calculation on a message and converting it into a numeric hash value.

There are five main considerations in implementing a cryptography system:

• Confidentiality
• Integrity
• Authentication
• Non-repudiation ...