@DervishHe didn't intercept it himself. It was most likely traded to him for a favor, or in exchange for other information, possibly biotic weapons, possibly conventional weapon designs. Typically, information like that gets taken by someone close to the subject, traded or sold to someone who somewhat knows the subject, then to someone who knows of the subject, then to someone who doesn't know the subject, then to Ellis Taevon. I doubt it was a big job. Probably just a bodyguarding gig. Maybe even corporate sabotage.
Still presents the problem of who would have had access to his information to sell it, or why Ellis would be interested in it to begin with. The messages from the Spectres were sent out recently, and once again, Rykarn is utterly unremarkable among the aliens remaining on Earth with a very minimal Extranet footprint that wouldn't be worth very much to anyone.
I hate to kind of harp on the point, but this kind of verges on power playing aspects of my character because you are giving your character access to my character's information without running it by me first.
Imagine if you will that you were trying to keep Ellis' Cerberus history under wraps and another character had either hacked into his data or paid for it, like you claim Ellis had done (once again, I don't see why he'd pick Rykarn's data for a trade to begin with), and suddenly spilled that out to the group, changing their opinions and dynamics towards that character, or they suddenly had schematics of his suit and could figure out how to exploit it. It's a very similar premise and problem.
I just don't see why you see the need to veer from the premise that every character was on the Spectre's radar and were individually contacted.
