Trac spam

[Herbert Valerio Riedel]

On 2014-07-14 at 09:34:07 +0200, Simon Peyton Jones wrote:
> Is it possible to stop spam on GHC's Trac?

A few days ago, bots/users registering via @yahoo.com addresses managed
to break the (rather simple) text-based algebraic captcha. I guess we
need to up the game and maybe switch to a (simple) Haskell-themed
captcha...  any suggestions of something easy to implement (in Python)?

Cheers,
  hvr