But, imagine a player's joy at detecting a message coming from the imperial base, but failing at the next "interception" check?
I can certainly see detection and interception being a single check, and then decoding/decrypting being a second check. And I could see good reasons why those should actually be handled by separate skills, or at least optionally handled by separate skills.
I've been using Computers to Detect/Intercept then Computers again for decoding an encoded/encrypted message. What other skills would be appropriate? I did add Vigilance for Detect/Intercept if the PC is sitting around all day at a comms station monitoring traffic versus Computers when making a single, active attempt.