Elliptic Curve Cypher
A Complex, hard to crack Cypher, represented by a screen of numbers that cancel to 0 as it is cracked. To get past this you will need a Decypher. Once again, the more secure the system, the longer it takes to crack. Cracking these is very CPU intensive, so you should make sure you have a good machine before attempting to hack a server with one of these.

Voice Print Analysis
Uses a recorded message of the System Administrators voice, so that only the person with that voice can access the system. This is defeated by using a Voice Analyser, with the appropriate voice recorded into it. Simply playing sample back will unlock the security and allow you to enter.

Monitors
Most systems in the game have a monitor. It is what tells the company that someone is trying to hack into their system so that they can trace you while you are still attempting to enter the server. These are overcome using a Monitor Bypass, though the Bypass has to be of equal or higher level to the Monitor itself. If the Monitor is bypassed, you can break all of the systems security before they begin tracing you.

Proxys/Firewalls
A lot of systems have either a Proxy, or and Proxy and a firewall. These don't do anything to stop you form accessing the system, but they do stop you from modifying anything on that system should you gain access. There are 2 ways around these. The Bypass, which works in the exact same way as the Monitor Bypass, and the Disabler. The Disabler will stop a security device from working while you are connected to the server, allowing you to modify the files or records on the server. They do, however, take time to work, and will alert the company to your presence almost instantly.