Lots of discussion about the security of Touch ID on the new iPhone 5s. Not surprisingly there are already reports of duplicating fingerprints to trick the Touch ID system. Tim Bray does a good job of giving this some context.

Security is about trade offs, and this one has plenty of variables that come into play. What I haven’t seen much talk about is that this isn’t necessarily a one time decision. Let me give an example. For every day use I may decide that finger print scanning with Touch ID is fine. Then, when I am traveling I may decide that I would prefer to use a passcode instead.

Security isn’t a one time decision, and when variables important to you change then it is reasonable that your security decisions will change as well.