CST311 Module 4

 This week had a larger focus on network security such as cryptography, message integrity, end-to-end authentication, and securing TCP connections. The core concepts of network security are confidentiality, authentication, message integrity, and access / availability. The some primary issues of security on the internet are the possibilities of eavesdropping, impersonation, hijacking, and denial of service. A fix for some of these issues is cryptography -- where users have sets of keys such as private and public keys that allow them to authenticate their own messages to others and authenticate the messages sent by other users. For data integrity, systems can utilize hash keys which allow users to verify that a file was received exactly as it was sent -- with no changes being made to it in between. TCP connections can be secured using TLS.