05499294 is referenced by 440 patents and cites 7 patents.

A digital camera equipped with a processor for authentication of images produced from an image file taken by the digital camera is provided. The digital camera processor has embedded therein a private key unique to it, and the camera housing has a public key that is so uniquely related to the private key that digital data encrypted with the private key may be decrypted using the public key. The digital camera processor comprises means for calculating a hash of the image file using a predetermined algorithm, and second means for encrypting the image hash with the private key, thereby producing a digital signature. The image file and the digital signature are stored in suitable recording means so they will be available together. Apparatus for authenticating the image file as being free of any alteration uses the public key for decrypting the digital signature, thereby deriving a secure image hash identical to the image hash produced by the digital camera and used to produce the digital signature. The authenticating apparatus calculates from the image file an image hash using the same algorithm as before. By comparing this last image hash with the secure image hash, authenticity of the image file is determined if they match. Other techniques to address time-honored methods of deception, such as attaching false captions or inducing forced perspectives, are included.

Title
Digital camera with apparatus for authentication of images produced from an image file
Application Number
159980
Publication Number
5499294
Application Date
May 24, 1995
Publication Date
March 12, 1996
Inventor
Gary L Friedman
Encino
CA, US
Agent
John H Kusmiss
Assignee
The United States of America represented by the Administrator of the National Aeronautics and Space Administration
DC, US
IPC
H04L 9/00
H04K 1/00
H04N 7/167
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