Voiceprint
A voiceprint, also known as a voice analysis, was an electronically recorded representation of a voice in graphical format. Each voiceprint was unique to the individual speaker. They could sometimes be imitated by voice duplicators, but strong software could detect the deception.

They were commonly used security methods to identify individuals when accessing critical or secured information, including on turbolifts. They had (for the most part) replaced retinal scans between the 21st and 24th centuries.

In 1968, a Beta 5 computer requested that a man identify himself. He responded for it to check his voice pattern, which would find him listed as Supervisor 194, code name Gary Seven. ()

In 2258 of the alternate reality, the  recognized 's voiceprint as that of Ambassador Spock. ()

In the 23rd century, a voice analysis was a primary part of the Steinman analysis method of comparing someone against their baseline retained in Starfleet personnel files. ()

In 2266, Kirk suspected Anton Karidian of being Kodos, something that a voiceprint suggested was possible, but Kirk was unwilling to convict someone on something that was only "close". ()

Voiceprint authorization is required to open a code 47 encrypted communication channel. ()

In 2370, Miles O'Brien's voice was recorded by , a surgically altered Cardassian spy, and was used to create a fake voiceprint to access a weapons locker aboard Deep Space 9, to steal photon torpedoes. ()

In 2371, Quark accessed Deep Space 9's computer systems to download Kira Nerys' voiceprint, along with her retinal scan and psychological profile, in order to put together a holographic version of her for Tiron. ()

In 2373, aboard the , Chakotay restricted all of the computer interfaces to Starfleet voiceprints only when the crew was being replaced by Nyrians. ()

Later that year, on Voyagers holodeck, the computer denied Tuvok from belaying the self-destruct command because his voiceprint was not recognized, due to the fact Seska had locked the holodeck systems. ()

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Communications technology
Identification technology
Analyses