An encryption code was a method used to encrypt data held within a computer from being accessed by an outside intruder.

In 2151, Hoshi Sato proposed that it would be easier breaking a Vulcan encryption code than getting the information what Malcolm Reed's favorite food is. (ENT: "Silent Enemy")

Seven of Nine used Borg encryption codes to access the turbolifts and blocked Harry Kim's commands on her way to the shuttlebay on deck 10. (VOY: "The Raven")

In 2374, Seven of Nine used such an encryption code when initializing the transport of the Alpha-Hirogen and the member of Species 8472. Harry Kim was unable to stop this transport due to the Borg encryption code. (VOY: "Prey")

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