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...