Project Euler is partly back (opens in new tab)

Thanks!

A few months ago I made a gem to manage, run, and test project euler problems.

https://github.com/yaworsw/euler-manager

Did this pretty quickly: http://project-euler-solution.herokuapp.com/

Give it a shot? Don't have answers to all questions.

You can check out codebot[0] for checking your solutions. The source and problems are all on GitHub: https://github.com/sdslabs/codebot

[0]: http://codebot.sdslabs.co/

crypto101 says that because of how fast GPUs are at computing hashes, even using long per-user salt is now broken and you must use pbkdf2 or better yet, scrypt.

It should, and they just said "the integrity of weak passwords cannot be guaranteed" -- even the best salting cannot prevent attackers performing brute force attacks; it will be slow, but weak passwords may be cracked in reasonable time.