|Sent on:||Friday, November 9, 2012 10:30 AM|
# Subject: Round 19: Beware of the spooks.
## A fun way to spend some time...
Implement [RC4](https://en.wikipedia.org/wiki/RC4) in your favorite
language. It's not incredibly complicated, and it has many known
weaknesses, but it's a fun exercise in crytographic meanderings.
Then, you should of course share it on the list.
(See my implementation in
[Guile Scheme](https://gist.github.com/4045208). It took 27 minutes
to write and debug (at 5:30 in the morning). See? Quick.)