I was looking up technical information suitable for implementing some of the SSTV modes (Robot 36, given the recent satellite activity). Here's a paper by JL Barber, N7CXI that gives you what you need to know. Robot36 is particularly fussy: uses an odd color space, Y, R-Y, and B-Y, with the difference channels sent only at half the rate of the Y (intensity) information. I have something in mind for this, and I'll probably dummy up a Robot36 encoder soon.
A couple of weeks ago during lunch, someone had mentioned that a breakthrough in the world of cryptography had occurred: that someone had succeeded in creating something called a "homomorphic encryption scheme". The thing was, nobody at the table really understood what that was all about. I did a brief bit of reading on it, and once I got the basic idea, I realized that yes indeed, it was a pretty amazing result, and pretty surprising. But rather than try to describe it to you, I'll toss you to this recent link on Bruce Schneier's website for his explanation.