i want to implement Pseudo Random Function for these two functions in java:
f(sk,.)={0,1}^* multiply sk ---> {0,1}^k,
where sk is secret key (a random key).
g(.,.)= {0,1}^k multiply {0,1} ----> {0,1}^L
which function should used in this case.
You can use SecureRandom class in Java to generate cryptographically secure random numbers. See https://docs.oracle.com/javase/8/docs/api/java/security/SecureRandom.html
Pseudo Random numbers must to be calculated as a function of the current data, hour, minutes, seconds for being different in each current moment.
Use the Random function which you already have in Java, and set the seed to set your secret key. Check the answers in this thread.
https://stackoverflow.com/questions/12458383/java-random-numbers-using-a-seed
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