Showing posts with label ur300. Show all posts
Showing posts with label ur300. Show all posts

Monday, June 4, 2012

Defcon 20 QUALS - urandom 300


Connect to the given host and port, with the provided password.

The problem is as follow:
  Here come 100000 uint16_t, please tell me how to sort them into
  ascending order by sending me pairs of indicies to exchange, one
  per line, in the format: <index1>:<index2>
  For example to exchange elements 123 and 9821 you should send:
  123:9821
  Valid indicies are in the range 0..99999 inclusive. Send a blank
  line when you are done. If you correctly sort the array in
  sufficiently few moves I will give you a key!
  You have about 10 seconds to finish, and a 5 minute wait between
  successive connections.