4 ms·
This is not a one-time pad. It uses a key that contains less information than the message. It is still possible to brute-force the key if you have enough data.
by oofabz 13y ago
This is not a one-time pad. It uses a key that contains less information than the message. It is still possible to brute-force the key if you have enough data.
It is a great way to make the key hard to copy, which is how encryption is usually circumvented in practice.
- danbruc 13y agoYou misread it - they are not using any short keys.
- _void_star_ 13y agoI'm not sure you right on this. The way I'm reading it they generate the keys by sending the same random signals through each set of glass. If they send N signals through the glass and N is >= the message length then it certainly is a one-time pad. The two keys end up being as long as (or likely longer than) the message, so you can't brute force it.
- duaneb 13y agoYou're assuming that the structure of the glass can't be 'compressed' with assumptions about the structure of the glass.... At least the key space could be reduced well below the naïve entropy estimate.