In forensic science, questioned document examination is the examination of documents potentially disputed in a court of law. Its primary purpose is to provide evidence about a suspicious or questionab
Ransom note left at the site of the Lindbergh kidnapping
The printer used to print a document can be forensically established using the Machine Identification Code.
A £5 note (White fiver) forged by Sachsenhausen concentration camp prisoners as part of Operation Bernhard
Photo of victim Bryan Hartnell's car door, onto which the Zodiac Killer wrote details of his attack upon Hartnell and Cecelia Shepard
Authentication
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Authentication is the act of proving an assertion, such as the identity of a computer system user. In contrast with identification, the act of indicating a person or thing's identity, authentication i
ATM user authenticating himself
A security hologram label on an electronics box for authentication
A military police officer checks a driver's identification card before allowing her to enter a military base.
NSA KAL-55B Tactical Authentication System used by the U.S. military during the Vietnam War – National Cryptologic Museum