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The DVA (Digital Video Authenticator) system can be used to prove that a digital video has not been modified since it was first recorded. The software is implemented on a commercial laptop or on a palmtop that works with any standards-compliant digital camcorder. While the camcorder is recording, the system simultaneously generates and records three digital signatures for each frame. The encrypted signatures make it possible to prove that the original video and the video offered as evidence in court are identical.
Engineering prototype of the Digital Video Authenticator with palmtop and standards-compliant camcorder.
The DVA can prove that a video offered as evidence in court, for example, is identical to the video an agent originally made in the field. Digital signatures are a secure, widely accepted method of ensuring data integrity. The signature is a short abbreviation of the message encrypted via public-key cryptography. One key (the private key) is used to encrypt the data, and another (the public key) is used to decrypt it. The private key is embedded in the DVA and inaccessible to external devices. It is used to sign the video frames in real time, as the video is recorded, and is destroyed immediately afterwards to prevent later editorial tampering. LEARN MORE . . .
Any organization involved with collecting evidence for use in civil or criminal legal cases could benefit from use of this technology. The system offers several of benefits:
- The DVA process preserves the digital video recording without alteration, unlike watermarking techniques, for example, which superimpose data over the evidence.
- Because signatures are created for every frame, even a single frame can be authenticated.
- The DVA is implemented on a commercial laptop computer that attaches to standard, commercial off-the-shelf camcorders.
- Standards compliance, particularly the use of National Institute of Standards and Technology (NIST)-certified digital signature software, offers the sound, recognized scientific principles that a judge can rely upon in ruling on the admissibility of digital signatures to authenticate digital video evidence.
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