4 ms·
Is that approach information-theoretically secure? Shamir Secret Sharing is, and the mathematics is very simple. Note that the encryption step is, strictly spe
by cyphar 3y ago
Is that approach information-theoretically secure? Shamir Secret Sharing is, and the mathematics is very simple.
Note that the encryption step is, strictly speaking, not necessary for Shamir either. But there are benefits to encrypting the secret and only using SSS for the key (I'm not sure if that's how Horcrux works, but that's how my fairly-similar tool Paperback[1] works).
[1]: https://github.com/cyphar/paperback https://github.com/cyphar/paperback
- coppsilgold 3y ago> Is that approach information-theoretically secure? No. But neither is SSS if an encryption key is involved - because the symmetric encryption step is not information-theoretically secure. Using SSS directly on the input will be information-theoretically secure but also multiply the size of the input. > and the mathematics is very simple. The mathematics of SSS and Reed-Solomon are virtually identical.