Questions tagged [three-pass-protocol]
The three-pass protocol uses commutative encryption to let two people communicate privately without having to exchange keys in advance.
5 questions
7
votes
1
answer
647
views
Can two people with different one time pads securely exchange a message like this?
Alice has a message, generates a one time pad, encrypts her message and sends it to Bob. Bob generates his own one time pad, encrypts the message again, and sends it back to Alice. Alice then decrypts ...
- 173
5
votes
2
answers
2k
views
2way cryptography
Imagine Alice sending Bob a message. They act like this:
Alice encrypts a message with her key and sends it to Bob.
Bob encrypts the message again with his key and sends it back to Alice.
Alice ...
- 91
4
votes
1
answer
461
views
What is the name of this kind of protocol
There is a communication protocol that I believe creates the equivalent of a one time pad, with the downside that the secret message must be transferred multiple times. The protocol is so simple that ...
- 143
2
votes
1
answer
176
views
Requirements for the modulus in the Massey-Omura three pass protocol
In the Massey-Omura three pass protocol:
How many bits long should the prime modulus $M$ be in order to be secure?
Should the $M$ be secret?
Should the $M$ be generated every time or it could be ...
- 573
1
vote
1
answer
1k
views
Multiple encryption using the same key
I am a newbie to this area. I have a program that uses a custom algorithm to encrypt a message. I can encrypt it as many times as I want, but using the same key. I have couple of questions so that I ...
- 31