http://www.acooke.org/cute/Andrew Cooke's blogWed, 22 May 2013 04:44:36 GMTPyRSS2Gen-1.1.0http://blogs.law.harvard.edu/tech/rsshttp://www.acooke.org/cute/Printingbi0.html This was preliminary work for the StackOverflow answer at http://stackoverflow.com/questions/11096134/print-a-binary-tree-on-its-side/16680023#16680023 - I did it while on holiday (installed Python on Mum's laptop :o) and then posted the answer when I got home. I have modified these posts since first writing them to improve the code and explanation a little. To be honest, it's not very exciting ...Printingbi0.html Mon, 13 May 2013 11:16:00 GMThttp://www.acooke.org/cute/Pythonssad0.html Python is about to get an Enum. See http://www.python.org/dev/peps/pep-0435/ And it's sad. It's not awful. It just fails to do anything particularly well - it's an awkward compromise whose only real achievement is not doing anything new. What would you expect a Pythonic enum to look like? class Colour(Enum): red green > print(Colour.red == Colour.green) false That's abou...Pythonssad0.html Sat, 11 May 2013 11:03:00 GMThttp://www.acooke.org/cute/WorkExhaus0.html Being tired is a common symptom of MS. With vacations coming up I took care to tell one client I needed to have as much time as possible to complete. At the same time I was balancing another project on the side, but that was almost done. So the plan was to get both in a good state before the holiday. And that, as far as it went, worked. But one client decided to test a project that was compl...WorkExhaus0.html Wed, 08 May 2013 09:09:00 GMThttp://www.acooke.org/cute/VirtualBox1.html It hangs at the end of boot. There's a solution at http://www.techpository.com/?page_id=1487 In short: - At start of boot, hit any key, then "a", then append "single" and hit return. - As root, zap /etc/X11/xorg.conf and then reboot. Andrew VirtualBox1.html Tue, 07 May 2013 12:46:00 GMThttp://www.acooke.org/cute/MatasanoPr0.html I just finished the crypto challenge. I (vaguely) remember, many years ago, sitting down to write a library that would help me with cryptanalysis (I've always be interested in codes and the like). Back then I wasn't (I hope) as good a programmer as I am now. Or, at least, not as experienced. And I remember getting stuck in analysis paralysis quite quickly. The project never got very far. Lo...MatasanoPr0.html Sun, 05 May 2013 23:07:00 GMThttp://www.acooke.org/cute/PDFtoHTML0.html https://github.com/coolwanglu/pdf2htmlEX Look at the first example. Mind-blowing. Andrew PDFtoHTML0.html Sun, 05 May 2013 12:32:00 GMThttp://www.acooke.org/cute/WhyRSAWork0.html I've been implementing and cracking RSA, but, until now, it's not been clear to me exactly why it works. Or why it seems to be commutative (which is why you can sign too). Or why the totient - (p-1)*(q-1) - is used. All those questions were answered, plop (as they say in Chile), when I saw equation 1 of this post: http://doctrina.org/Why-RSA-Works-Three-Fundamental-Questions-Answered.html Ah...WhyRSAWork0.html Sat, 04 May 2013 16:25:00 GMThttp://www.acooke.org/cute/Dreamingof0.html You probably want to skip this. Writing more for myself, just to clear my head. Last night (this morning, I think, just before I woke) I dreamt that I killed myself. I found myself, dead, and picked myself up. I was full of compassion, but not sadness. I don't really understand why I had this dream now. I was much more worried about dying back in November. Things are much better now. What...Dreamingof0.html Fri, 03 May 2013 21:29:00 GMThttp://www.acooke.org/cute/UsingCorou0.html I don't want to sound like a shill, but I am having a great time with the Matasano crypto challenges http://www.matasano.com/articles/crypto-challenges/ and I wanted to share a neat trick. So I just got DH key exchange working. Which is awesome - I had no idea it was so easy. But what made me extra-happy was the way that I coded the two agents that were communicating. I wrote each as a co-rou...UsingCorou0.html Mon, 29 Apr 2013 21:14:00 GMThttp://www.acooke.org/cute/PurePython0.html I am working through the Matasano Crypto Challenges - http://www.matasano.com/articles/crypto-challenges/ - which I would recommend to anyone interested in crypto. Although they repeatedly ask not to post solutions online, they do ask (in part 4, I think) for you to find (rather than implement) implementations of SHA1 and MD4. So I hope that it is OK for me to post these. The two implementatio...PurePython0.html Sun, 28 Apr 2013 10:01:00 GMThttp://www.acooke.org/cute/UbuntuonVi0.html Ubuntu 12.04-2 does not install cleanly on the latest VirtualBox (4.12.2). Instead, install 12.04 (the initial release) and DO NOT UPDATE KERNEL packages (if you really want to, snapshot first). Andrew UbuntuonVi0.html Tue, 23 Apr 2013 14:28:00 GMT