How not to...

... prevent fraud:

... commit fraud:

-- Birgit

A number of ways not to secure things...

... found over the last years on the Internet.

Scissors.

Cordless screwdrivers.

Wire cutters.


-- Birgit

A number of ways not to build a door...

... found over the last years on the Internet.

Access control for dummies.

Building a fence for dummies.

Building a door for dummies.


-- Birgit

A number of ways not to lock a door...

... found over the last years on the Internet.

I hope this one is in good humour and not meant seriously.

I'm not so certain about this one...

And this is a wonderful example that "more security" is not necessarily more security. In fact, it reduces the problem of having to pick a door lock to the problem of having to pick any of these door locks, making it only as secure as the most insecure of them. The larger the number of locks, the larger the probability that one of them sucks...


-- Birgit

A number of ways not to lock your bike...

... found over the last years on the Internet.

This one is probably hardest to open for the owner himself.

Topology is a bitch...

... again ...

... and again ...

... and again ...

... and again ...

... and again.

And also the other way round, by the way. No matter how impressive that lock is otherwise.

... but topology is not the only problem you can run into.


-- Birgit