3 ms·
This is a very interesting way of solving the key distribution problem. It forces attackers to capture both the digital part of the key and the physical.
by Lanzaa 13y ago
This is a very interesting way of solving the key distribution problem. It forces attackers to capture both the digital part of the key and the physical.
- rosser 13y agoThis doesn't solve the key distribution problem at all: To start off, both Alice and Bob must have their own slabs of diffusing glass and must physically meet to create a key for encoding a message later. Like any other OTP system, key distribution — ensuring that the parties who wish to communicate securely have a shared secret (or secrets in the case of OTP; the whole point of OTP is that a key is only used once) — is the weak point. Unlike many other OTP systems, this one requires a physical meeting, which, depending on your use-case for needing crypto in the first place, may be impossible, or deadly dangerous. At best, this complicates key compromise. EDIT: clarifying language.
- _red 13y agoCorrect, I can't see the practical use of this. If Alice and Bob must have a secure method to jointly compute K(A) ⊕ K(B), then why wouldn't then use that same method to just exchange the data?
- dsr_ 13y agoAt the time of their key-exchange meeting, they don't know what messages they will want to exchange later.