maemo.org - Talk - View Single Post - Unbreakable cipher app

reinob	2014-01-02 , 16:15
Posts: 1,808 \| Thanked: 4,272 times \| Joined on Feb 2011 @ Germany	#19

Originally Posted by biketool

Reinob,
If the computer takes a truly random seed, say a bare CCD facing a mildly radioactive object or even the input of the camera as the user randomly waves it around and you can get one time pad level seeding as good and probably far better than rolling dice or picking lottery number balls.

1) OP is talking "app", as in smartphone-app.
2) this is seriously unrealistic. The receiving party needs to have the password in order to decrypt the message (we're talking symmetric encryption).

you'd need to (externally) generate the sequence, send it over to your partner (*not* from phone) and then somehow make the app use that sequence ("please type your message", "please type your 5087-character password"). As soon as the user types the password you've lost already.

OTP is a theoretical construct. Like a Turing machine if you like. You can talk about it, you can use to model stuff, to gain information about stuff. You just can't build it.

Quote & Reply |

The Following User Says Thank You to reinob For This Useful Post:
Jordi