On 30/06/2010, at 9:34 AM, Nicholas Jefferson wrote:
>> I'd be even more interested if you talked about cryptanalysis techniques. :-)
> In theory or in practice? [1]
> [1] http://xkcd.com/538/

Heh... hadn't seen that one. Very true. I always liked the 2000AD comic where 
bands of muggers would kill people and chop off their hands and pull out their 
eyes to access the super-secure fingerprint/retina scanners on MegaCityOne ATMs.

Surprisingly, I've got a remarkably legitimate need for cryptanalysis.

A number of years ago, a good friend of mine died. He had been keeping a 
journal, which he had encrypted, because he had lots of damning things to say 
about everyone he knew. They weren't conspiratorial, just very personal 
comments, I believe. Anyway, he said to one of his friends: "When I'm dead, you 
should publish my diary. It'll be a hoot!" Anyway, he died quite suddenly, and 
left no-one with the password. He claimed we should all be able to figure out 
the password, anyway. Well, we couldn't.

He was using some old crypto tool on Mac OS 9, whose only interface is this 
crappy little GUI. I tried using AppleScript to script a dictionary attack, but 
it was very brittle, and at any rate, I don't have a working OS 9 machine left 
any more.

It's quite likely that the encryption scheme is quite weak, and may be 
brute-force crackable in reasonable time... but I know bugger-all about the 
entire subject.

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