IIRC, the system didn't exchange plaintext to nodes on other campuses. It passed signatures and each institution maintained their own collections for definitive

IIRC, the system didn't exchange plaintext to nodes on other campuses. It passed signatures and each institution maintained their own collections for definitive comparison because the most common case was submitting someone else's work from another year. It was the era of barely high speed internet. Perhaps with the advent of generative LLMs, this will assist in the generation of entirely personalized university assignments and exams making "replay attack" cheating impossible. Hopefully, LLMs will also semi-automate correctness verification of exams and correct answers.