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Add solution for 5j

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Tobias Eidelpes 2022-06-21 17:37:40 +02:00
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exam/ex.tex
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@ -319,7 +319,18 @@
and simulated transcripts are the same. A given valid transcript occurs with
probability $1/2^{130}$.
\item \TODO
\item $\mathsf{ID}_{CGI2}$ can be used for authentication if a client
(prover) proves to a server (verifier) the possession of a password
without actually revealing it. The client shares a commitment with the
server and as soon as the client wants to log-in, it receives a challenge
from the server. If the client can successfully pass the challenge (i.e.,
the response from the client is equal to the commitment), it is
authenticated with the server.
The advantage of such a scheme over conventional password-based
authentication is that the secret is never transmitted to anyone.
Futhermore, the commitment is also not vulnerable to dictionary attacks,
as is common with stored password hashes on the server's side.
\item \TODO