Dr. Elara Vane stared at the oscilloscope. For three weeks, a faint, repeating signal had ghosted across the deep-space array's readout: kpsdk .
It looks like you're asking for a piece of writing that includes or is based on the string "kpsdk" . Since this isn't a standard word or acronym, I’ll interpret it creatively.
It was a key.
kpsdk wasn't a message.