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to Hash Functions
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.