4 ms·
I don't get how this is better than keypair cryptography.
by bnr 15y ago
I don't get how this is better than keypair cryptography.
- deleted 15y ago[deleted]
- DarkShikari 15y agoRSA cryptography can be broken quickly by quantum computers. There are other public/private key schemes that might avoid that problem, though none are widely used. Some of these rely on NP-complete problems instead of merely BQP problems like factoring. Quantum cryptography, if correctly implemented, should be theoretically unbreakable, not merely "hard" to break -- much like a one-time pad.
- mindslight 15y agoI know of no one time pad algorithms for message authentication, which is a critical component of basically all real-world cryptographic systems. IMHO talking about bare XOR as "theoretically unbreakable" misleads newbies as to the important concepts in modern cryptography.
- mindslight 15y agoBasically, your marketing materials get to say that you implement the cool new thing. Current QC accomplishes shared key generation only (so it's similar to a public key primitive like DH). Bulk ciphering and MAC are still done by classical symmetric algorithms. Forgoing the fibre and only using the pre-shared key would yield similar security properties.