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Criptography Question

Started by Prozak Dec 24, 2004 at 4:53 AM 4 replies 900+ views
Original Post
Prozak
Prozak
If A and B talk through a certain medium where K can allways listen in, is there any criptographic way to make sure that K cant reverse engineer the conversation after the point where A and B have entered into a encrypted conversation? Basicly, A and B start out with a handshaking "talk", where i suppose the key is sent, and then they go into encrypted "talk" mode... ... my question is, if K listened to the whole conversation, then there is no criptographic method to make sure K didnt get the whole conversation, correct?
Sharlin
Sharlin
A and B could have agreed on the key on another channel that K has no access to.

Even assuming that K has at any given time access to *every* communication channel between A and B, there indeed is a way to have secure communications without swapping any kind of private key: Public-key cryptography.
SamLowry
SamLowry
It is very well possible to have a conversation between A and B so that a) no K can understand what they're saying and b) no K can modify the contents of the messages.

Public key cryptography isn't as simple as it sounds. If A wants to go get B's public key, how is he going to do that securely? There might be an evil K pretending to be B.

Anyway, it is possible to have a secure conversation, but it's difficult to set up. The way to solve your problem depends very much on the exact situation you're in.

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