The non-repudiation tag has no wiki summary.
3
votes
2answers
138 views
Can one have an authentic, but repudiable, message without a previously shared secret?
Bob wants to send a message to Alice, such that Alice can be sure that the message came from Bob, but can't prove it to anyone else.
If I understand right, this means that the same message could have ...
3
votes
1answer
400 views
What are the differences between a digital signature, a MAC and a hash?
A message may be accompanied with a digital signature, a MAC or a message hash, as a proof of some kind.
Which assurances does each primitive provide to the recipient?
What kind of keys are needed?
3
votes
3answers
129 views
Can I use PGP to sign a message without providing cryptographic non-repudation?
The difference between a digital signature and a MAC is non-repudiation. A message with a digital signature proves that only the sender could have signed the message, whereas a message with a MAC ...
5
votes
2answers
206 views
Does a trace of SSL packets provide a proof of data authenticity?
I'm wondering if it would make sense to record a whole HTTPS session,
publish its encryption keys and present it to third parties as a proof
that this particular data was sent by a given server ...
9
votes
2answers
301 views
How should one implement a delegated shared trust protocol?
Consider the following (probably naive) scenario.
Alice, who is very limited in her knowledge of security in general (clueless about securing a private key for example), wishes to delegate certain ...
