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Colin McEwan
Works at MStar Semiconductor
Attended University of Glasgow
Lives in Edinburgh, UK
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Internet hivemind! We have an iPhone 3GS that we use for games for Sam. A couple don't want to run. Should I try iOS7?
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Colin McEwan

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I know I'm getting a bit ahead of myself here, but this is the sort of thing that warrants a bit of forethought.

So, a question: if you were planning on making a sightseeing trip, starting round the East of Scotland, with a radius of about 100 miles, what would be your most highly recommended sights to see?

Note: must be impressive and worthwhile from about 2000' in the air.
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You probably already know, but we open in April with two evening launch events on the 17th & 18th - check out the helix website for details. www.thehelix.co.uk
Glad you like us ☺
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Clutha crash: mysterious double flame-out and no successful autorotate... still a mystery.
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About to log out of the company VPN for the last time. sniff
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Looking forward to Monday! :)
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Stupid decision. The advert is aimed at motorists, an since helmets aren't required, motorists need to be made aware that there are cyclists who don't wear helmets, and that they're at extra risk.

Just as cyclists need to be aware of aggressive motorists, even though driving aggressively is "socially irrresponsible".
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Colin McEwan

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The Wilksch WAM engine programme are one of the most exciting new aero-engine programmes around at the moment. The 2-stroke diesel cycle is so obviously the right fit technology for aero-engines.
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This sums up my feelings on the American crime of "Jaywalking". Heavy-handedly restricting the freedom of pedestrians in an environment where they're already vulnerable and given insufficient consideration is the wrong way to go about improving safety. But, mostly, the name "Jaywalking" just sounds... really kinda stupid.
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Combine getting stopped for jaywalking with not carrying an ID and you get a visit to the jail cell. Land of the Free! Whoop, whoop!
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How much stuff can be crammed into the back of a Lupo?

Actually... back and front, technically. 
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Well, I had a djembe in there as well on the way out, but yeah, there was still some room. :)
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Question for the assembled nerderati. Apparently on a password reset, FaceBook warns you when your password is too similar to (but not identical to) your old one: this happens even when you don't re-enter the old password. 

Naively, this sounds like they're doing plaintext edit distance comparisons on the two passwords (as PAM does); but without having the user re-enter the old password, it sort of sounds a bit like they must be storing passwords reversibly encrypted in order to retrieve the old one to compare against.

I'm completely refusing to believe that even Facebook are that stupid, so there's an intriguing question: how do they do it?

First thing that comes to mind is to try simple obvious edits from the new password (which is to hand, obviously), hashing those and checking against the old password hash. If you get a match, complain that the passwords are too similar. The obvious edits are incrementing/decrementing numbers, replacing numbers to the similar-looking letters and vice-versa.

...which of course is exactly what cracklib does. So, taking the new password, adding it to a dictionary (possibly with some preprocessing to separate out any obvious syllables or other components and add those separately), and running a few seconds of cracking time at it?

Sounds pretty reasonable to me?
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I like it. I was going to suggest doing it at password create-time, but then you've got a bunch of hashes in an array somewhere that are hashes of things that are almost the password... which means if the hashes and the 'almost' hashes get stolen together, the encryption would be compromised.  
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In his circles
197 people
Have him in circles
186 people
Kyle Hale's profile photo
David-John Pitts's profile photo
Alex Calgaro's profile photo
Joe Reda's profile photo
Jackie Clark's profile photo
Andrew Ducker's profile photo
Jennifer Cumming's profile photo
Lila Anne O'Leary's profile photo
Work
Occupation
Principal Architect: Compiler Technology
Employment
  • MStar Semiconductor
    Principal Architect: Compiler Technologies, 2011 - present
  • MediaTek
    DSP Processor Architect, 2010 - 2011
  • Analog Devices
    2006 - 2010
  • Broadcom
    2001 - 2003
  • Element 14 Inc
    1999 - 2001
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Edinburgh, UK
Previously
Cambridge, UK - Alexandria, UK
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Tagline
Sam's Dad
Introduction
Processor architecture, compiler, programming languages and indie music geek. Also dad, atheist, vegetarian, pizza chef, climber, and student pilot. 
-- [call]
Education
  • University of Glasgow
  • University of Edinburgh
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Gender
Male
Colin McEwan's +1's are the things they like, agree with, or want to recommend.
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