A $\_\_\_\_\_\_\_\_\_\_\_$ is an algorithm for which it is computationally infeasible to find either $($a$)$ a data object that maps to a pre$-$specified hash result or $($b$)$ two data objects that map to the same hash result.

a$.$cryptographic hash function

b$.$strong collision resistance

c$.$one$-$way hash function

d$.$compression function