I was asked recently to look at the security of the PhoneFactor 2-factor authentication solution. If you don't know what it is, then you can find out more here , but essentially you enter your username and password, then they phone you on your pre -defined number and press the # key to validate the authentication. The problem with just pressing the # key is obvious, but they allow you to configure entering a PIN number rather than just pressing the # key. To my mind, there should be no other option than having to type in the PIN number. However, this isn't necessarily a brilliant idea. As I've said before in this blog , a lot of phones log the digits dialled, in which case that PIN isn't secure. I was also told that the PSTN and GSM networks are secure, so this is a good solution. I'm not sure I agree that PSTN and GSM networks have good security. Analogue PSTN is easy to listen in to with proximity and GSM can theoretically be cracked, and probably will ...

I have been tasked with rolling out a trial multi-factor authentication system that must be user-friendly, secure, low-cost and have zero impact on the existing network and users who won't be on the trial. That should be simple! A trawl round the InfoSecurity Europe show always helps, as you can get the latest state of play from all the major vendors. This year there were the obvious keyring tokens, SmartCards, USB tokens, SMS solutions and some innovative software solutions, including GrIDsure. Before making any decisions about the solution to go for, several things need to be decided, among which are: how much security is required? What is considered user-friendly to a normal, non-technical user? What metrics should we use for authentication? To answer these we need to look at what authentication is first: Authentication is the binding of an identity to a subject. The subjects we're talking about in this case are users and we're trying to bind their digital identity, ...