As an all powerful, all knowing type of being, you would think Doctor Who would have better security. And, in fact, you would think that with only two really important pieces of technology to protect, the Tardis and the Sonic Screwdriver, that it wouldn’t be all that difficult to put some security in place. Unfortunately, there really is no apparent security as evidenced by the multiple times that both the Tardis and the Sonic Screwdriver were lost or stolen.
Seriously, with all the tech that the Doctor’s people seem to have at their disposal, you would think that they would have some sort of authentication required for someone to pilot the Tardis. Voice recognition or even bio scanning would make sense. Two of the most notable Tardis thieves, the Master and River Song, were able to abscond with the Tardis without much hassle at all. And there are at least a half dozen other examples of Tardis thievery both in the original series and the revived series.
It has also been assumed over the years that the Tardis was at least impenetrable to attacks from outside, but recently a squadron of Judoon were able to teleport onto the Tardis. Fans were not happy that the Judoon were able to do so, since the assumption had been that the Tardis at least had impenetrable shields. So apparently the Tardis doesn’t even have a decent firewall type of protection.
The Sonic Screwdriver doesn’t seem to be secured any better than the Tardis. This all powerful tool (depending on which Doctor’s screwdriver it was and apparently for some time was unable to affect wood in any way) should at least have some sort of biometric authentication enabled so that only the Doctor could use it, but it too was stolen at least once.
One would think that powerful and all knowing beings like the Time Lords would be much more advanced when it comes to security. Sadly, this is not the case. With a simple biometric or even voice authentication system in place, the Doctor would have been saved from a lot of dangerous situations. But, of course, where would the fun in that be?