Wiktionary
time codes
n. (time code English)
Usage examples of "time codes".
The aide at the screen was instructed by the doctor to project the initial reports of violence with time codes.
Watched Anshiser/Vegas Hotel data line, there was call-in call-back, enough data that may be two-way one-time codes, maybe simultaneous voice monitoring and clearance.
That's how we detected the navigation time codes in the first place.
There is a statistical possibility of breaking any code, though the probability lessens proportionately to security requirements, it was known that one-time codes, which were in the possession of only the people utilizing them, were being employed.