creyer

<?php

/* Strip out un-supported HTML tags */
$content = strip_tags($content, '<strong><em><del><li><code><pre>');

/* Properly format message */
$content = str_replace(array('<strong>', '</strong>'), array('*', '*'), $content);
$content = str_replace(array('<em>', '</em>'), array('_', '_'), $content);
$content = str_replace(array('<del>', '</del>'), array('~', '~'), $content);
$content = str_replace(array('<li>', '</li>'), array('•', ''), $content);

creyer

What's this all about?

Digital cryptography! This is a subject I've been interested in since taking a class with Prof. Fred Schneider back in college. Articles pop up on Hacker News fairly often that pique my interest and this technique is the result of one of them.

Specifically, this is about Lamport signatures. There are many signature algorithms (ECDSA and RSA are the most commonly used) but Lamport signatures are unique because they are formed using a hash function. Many cryptographers believe that this makes them resistant to attacks made possible by quantum computers.

How does a Lamport Signature work?

creyer

ּ_בּ
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טּ_טּ
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לּ_לּ
מּ_מּ
סּ_סּ
תּ_תּ
٩(×̯×)۶
٩(̾●̮̮̃̾•̃̾)۶

creyer

Answers http://stackoverflow.com/questions/10373318/mixing-in-a-trait-dynamically.

Compile as follows:
scalac Common_1.scala Macros_2.scala
scalac Common_1.scala Test_3.scala -cp <path to the result of the previous compilation>

Tested in 2.10.0-M3, will most likely not compile by the time 2.10.0 final is released, because we're actively rehashing the API. 
However the principles will remain the same in the final release, so the concept itself is okay.
upd. Code updated for 2.10.0-M7.
upd. Code updated for 2.10.0-RC1.