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seen Feb 6 at 1:22

Feb
5
comment Insecurity in Needham and Schroeder protocol?
Yes I agree. But to have a problem key must already be insecure. Thanks for the help
Feb
4
comment Insecurity in Needham and Schroeder protocol?
But if it is returned with the same nounce, Na, think no danger, only if the key was already violated so there is some danger. Because the KDC does not return the same key, even nounce that it is not unique. Or danger to resend the mesnsagem nounce the same?
Feb
3
comment Insecurity in Needham and Schroeder protocol?
ok, I think I realized the idea. However arose me another question about this protocol, Imagining that the first message from Alice to the KDC nounce is repeated for some reason, the nounce is not unique. This can generate some kind of problem?
Jan
31
asked Insecurity in Needham and Schroeder protocol?
Jan
21
comment Messages exchanged between Bob Alice are encrypted safe?
Yes, the problem in my reasoning thought if Bob decrypt a message with a public key of someone, such as Alice, knew that someone had encrypted with your private key, then it could only be that someone. Only that this mechanism really does not warrant authenticity of the writer's message. Such as this example of Mallory. Probably could only guarantee the authenticity with digital signature.
Jan
17
comment Messages exchanged between Bob Alice are encrypted safe?
Ok, but I can reach the conclusion that Alice encrypt your private key Ks with no warranty of authenticity, that is, no warranties to that Bob was Alice who wrote it, as if with a digital signature warrant that was Alice who wrote it?
Jan
17
comment Messages exchanged between Bob Alice are encrypted safe?
In conclusion if Alice simply encrypt with your private key Bob has no assurance of authenticity of the message, that is, that Alice wrote that right? Only with digital signature guarantee is that such authenticity?
Jan
17
comment Messages exchanged between Bob Alice are encrypted safe?
I understand what you say, but my situation is to verify the proper functioning, but given that scenario I described what conclusion we can reach. And one of which is: The Bob are not sure that it was Alice who wrote the message, ie, it may not be the broadcaster. And I do not understand why .. since Ks need to decrypt the public key of Alice just have to be sure that it was Alice who wrote. Given that scenario I do not see how you can reach that conclusion
Jan
16
comment Messages exchanged between Bob Alice are encrypted safe?
I admit I 'm confused .. But in this case for Bob decrypt the key Ks had to have the public key of Alice or am I thinking wrong?
Jan
15
awarded  Student
Jan
15
comment Messages exchanged between Bob Alice are encrypted safe?
yes I understand the reasoning . But still do not understand the conclusion reached in the logic described above. Only barely understand the concept of asymmetric cryptography . Because if Alice encrypts Ks with its private , then Bob will have to decrypt with the public key of Alice right? or is it with your public key? Because if it is with the public key of Alice and Bob must know Alice that was encrypted to know which public key to use . That's what's making me confused . Bob to decrypt that key Ks have to use? Thank you for your attention
Jan
15
asked Messages exchanged between Bob Alice are encrypted safe?