Q: When is a Diode not a Diode?

Q: When is a Diode not a Diode? April 2015 A: When it’s a Transistor or a Zener diode. What is a Diode? A diode allows an electric current to pass in one direction while blocking current in the opposite direction. It works using a doped silicon P-N Junction. If...

More on Air Gaps

MORE ON AIR GAPS March 2015 While Air-Gaps are a good conceptual solution, in practice beyond Schneier’s single PC example, they are very hard to achieve. There is nearly always a backdoor to be found somewhere that an attacker can exploit. Opinion is divided,...

Non-Routable Protocols and Networks

Non-Routable Protocols and Networks March 2015 Network segregation is a common security technique to prevent security issues in one network affecting another. When looking at how information can be moved or shared between such networks the concept of routable...

Guards are not Air Gaps

Guards are not Air Gaps December 2014 “An air gap is a network security measure that consists of ensuring that a secure computer network is physically isolated from unsecured networks, such as the public Internet or an unsecured local area network.” ...