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bio website launchpad.net/~flimm
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seen Mar 17 at 11:26

Dec
10
comment Can I use PGP to sign a message without providing cryptographic non-repudation?
Yes, there is a difference between authentication and non-repudiation.
Dec
10
answered What are the differences between a digital signature, a MAC and a hash?
Dec
10
asked What are the differences between a digital signature, a MAC and a hash?
Dec
10
comment Can I use PGP to sign a message without providing cryptographic non-repudation?
I downvoted this answer, because it does not distinguish correctly between a digital signature, a MAC and a hash.
Dec
10
comment Can I use PGP to sign a message without providing cryptographic non-repudation?
A digital signature proves that the message has been signed by the holder of the signature key, this proof can be passed to a third party, such as a judge. A MAC proves that the message has been signed by either the sender or the recipient, the recipient can not pass it to a third party to prove that the sender signed the message, since the recipient could also have generated the MAC. A hash proves that the message has not been modified assuming that the hash has not been modified, but it does not provide authentication, since anyone can create a hash.
Dec
9
comment Can I use PGP to sign a message without providing cryptographic non-repudation?
Is there any way using asymmetric encryption that you can achieve what a MAC achieves: authentication without non-repudiation?
Dec
9
comment Can I use PGP to sign a message without providing cryptographic non-repudation?
You don't have to publish your private key to remove non-repudiation, you can simply use a MAC. See this
Dec
9
asked Can I use PGP to sign a message without providing cryptographic non-repudation?
Dec
5
awarded  Scholar
Dec
5
accepted Is there any research on the problem of making a number more memorable to humans?
Dec
3
awarded  Student
Dec
3
asked Is there any research on the problem of making a number more memorable to humans?
Nov
7
awarded  Supporter