It's possibile to merge these two tags? Theyr meaning is the same.
Also: do you think it would be more appropriate to use the long version "computer-forensics"?
They should be merged yes, but only AviD has enough reputation to change tags right now.
I do not think you should use the long version, as it can really be applied to any tag. Just imagine all the overhead on the tags if we are going to have tags similar to computer-security-audit instead of just audit