Could somebody tell me what the meaning is of $h(r)$ in the protocol below?

‎‎$A‎\leftarrow‎{B}\quad:{h(r)‎‎}{,B}{,P{_A(r,B)}}‎ \\A‎\rightarrow‎{B}\quad:r$

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    $\begingroup$ $h$ is a hash function. $\;$ $\endgroup$ – user991 Apr 15 '15 at 19:47

As Ricky Demer already mentioned, $h$ is a hash function.

In the realms of cryptography, it mostly points to a secure hash function. But in the end, it doesn’t matter if it’s a secure hash or not… $h$ is standard notation for “hash”.

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