http://en.wikipedia.org/wiki/Secret_sharing
It would reduce the complexity of encrypting the data encryption key multiple times with each pair of keys, and the math behind them is pretty neat.
Red October is based on combinatorial techniques and trusted cryptographic primitives. We investigated using complicated secret primitives like Shamir's sharing scheme, but we found that a simpler combinatorial approach based on primitives from Go's standard library was preferable to implementing a mathematical algorithm from scratch.
Which seems like a reasonable choice for smallish numbers of keys/sharers, especially given the data they're encrypting isn't exactly huge.
Are there good libraries (for any language) implementing shared secrets?
[1] https://blog.cloudflare.com/red-october-cloudflares-open-sou...
[1] http://coresecret.io/ [2] http://eprint.iacr.org/2013/629
I googled around for ssss implementations and bsd license and found one in javascript of all things.
(Please no license flamewar, just stating the facts!)