R12 Isupplier - how can we tell who is logging in?

Hello,

We need to figure out who is actively using our production Isupplier. In the past EBS version we were able to see this from the Apache access_log files. In 12.2, there are similar logs in OHS, but the usernames appear to be encrypted. Is there a way to do this within EBS? Or through other log files?

Any information would be greatly appreciated.

Thanks.