Completely split into lines

[-Vit-]

Thanks. A good illustration that encryption schemes that rely merely on cutting up the image are amenable to brute-force image analysis. Per-pixel randomization can't be attacked that way, as long as it's done properly there should be no correlation to find in the encrypted pixels. I recently rewrote AddGrainC, for a completely different reason - to make it use less memory - I never posted it because it didn't really save that much memory. But this experiment interested me - I might add the option to output cryptographically secure random data for this kind of purpose. I've already based it on the Mersenne Twister random number generator, which afaik can be trivially turned into a secure sequence. I'd have to drop the cache, which would make that mode slower though...

[TheSkiller]

Vit, the encryption script you posted works very well, just tried it, thanks for that.
This kind of encryption is safe and easily reversible.

However, I'm still more interested in the original line shuffling type encryption "Syster" which is by the way related to Videocrypt (Syster is basically the predecessor). I like the way the video is unwatchable, yet occasionally you can still detect one or the other original picture structure very distantly. I know it's not really safe due to brute force hacking, but it surely is safe enough for the average Joe, and, you gotta admit that, it's pretty cool.