Digital signatures are a passion of mine (as is infosec in general). Signatures are an integral part of my cryptosystem Keyspace for which I wrote the red25519 gem. The red25519 gem’s sole purpose was to expose the state-of-the-art Ed25519 digital signature algorithm in Ruby. I have since moved on to implementing Ed25519 in the much more comprehensive RbNaCl gem. Point being, I have longed for a modern, secure digital signature system in Ruby and have been working hard to make that a reality.

Digital signatures are something I think about almost every single day, and that’s probably fairly unusual for a Rubyist. That said, if you do work with Ruby, you have hopefully been informed that RubyGems.org was compromised and that the integrity of all gems it hosted is now in question. Because of this, RubyGems.org is down. As someone who thinks about digital signatures every day, I have...

Rubyists are people who generally value elegance over performance. “CPU time is cheaper than developer time!” is a mantra Rubyists have repeated for years. Performance has almost always taken a second seat to producing beautiful code, to the point that Rubyists chose what used to be (but is no longer) the slowest programming language on earth in order to get things done.

You can file me under the “somewhat agree” category, or otherwise I’d be using languages with a better performance track record like Java, Scala, or even Clojure. That said, I like Ruby, and for my purposes it has been fast enough. I also like to make light of those who would sacrifice elegance for speed, at least in Ruby, calling out those who would do silly stuff “FOR SPEED!” while compromising code clarity (otherwise known as roflscaling).

The past year though, there’s been an idea creeping through the Ruby...

Let me provide a very different picture of how Rubyists used to view threads versus what the title of this post implies about now. I’m not talking about in 2005 in the early days of Rails. I’m talking about at Dr. Nic’s talk at RubyConf 2011, a little more than a year ago. Dr. Nic had a fairly simple message: when performance matters, build multithreaded programs on JRuby (also: stop using EventMachine). Now granted he was working the company that was subsidizing JRuby development at the time, but I didn’t, and I for one strongly agreed with him. Not many other people in the room did. The talk seemed to be met with a lot of incredulity.

“I thought this was going to be a talk on EventMachine!” said That Guy. Perhaps what That Guy missed was that Dr. Nic had hosted EventMachineConf as a subconference of RailsConf a few months before. And now Dr. Nic was saying don’t use EventMachine, use...

tl;dr: use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption. use authenticated encryption.

Do you keep up on the latest proceedings of the IACR CRYPTO conference? No? Then chances are whenever you have tried to use a cryptographic library you made some sort of catastrophic mistake which would lead to a complete loss of confidentiality of the data you’re trying to keep secret.

The most important question is: are you using an authenticated encryption mode? If you don’t know what authenticated encryption is, then you’ve probably already made a mistake. Here’s a hint: authenticated encryption has nothing to do with authenticating users into a webapp. It has everything to do...