hash in pbc

[sri vani]

In research paper named "Multikey searchable encryption", for ecryption hash function indicated by H2 is given as
H2: G1 X G2 -> {0,1}*
H2(r,token) -> h;
What this actually mean?
What operation I actually have to perform here on r and token? I used applying concatination for the two parameters but not getting the hash equal to hash of h.

[sri vani]

Hi what is secure hash function. Give some examples.

[Chuck Simmons]

https://www.google.com/search?q=secure+hash+function&oq=secure+hash+function+&aqs=chrome..69i57j0l5.8870j0j7&sourceid=chrome&ie=UTF-8

The SHA series and MD5 are perhaps the most well known.  SHA-0 and SHA-1 are no longer secure.

https://en.wikipedia.org/wiki/List_of_hash_functions#Keyed_cryptographic_hash_functions

https://en.wikipedia.org/wiki/Secure_Hash_Algorithms

https://en.wikipedia.org/wiki/Cryptographic_hash_function

On Wed, Apr 4, 2018 at 3:17 AM, sri vani <pulla....@gmail.com> wrote:

Hi what is secure hash function. Give some examples.

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