The apparatus calculates from the image file an image hash using the same algorithm as before. Apparatus for authenticating at any time 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 image file and the digital signature are stored in suitable recording means so they will be available together.

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 digital camera processor has embedded therein a private key unique to it, and the camera housing has a public key that is so uniquely based upon the private key that digital data encrypted with the private key by the processor may be decrypted using the public key. Instructions for constructing a digital pinhole camera and our method forâ€¦ĭigital camera with apparatus for authentication of images produced from an image fileĪ digital camera equipped with a processor for authentication of images produced from an image file taken by the digital camera is provided. Students can easily explore the effects of the size of the pinhole and its distance from the sensor on exposure time, magnification, and image quality. In this article we describe how the classic pinhole camera demonstration can be adapted for use with digital cameras. Price, technology requirements, features, transfer software, and accessories for the Kodak DC25, Olympus D-200L and Casio QV-100 are presented in a comparison table.

ERIC Educational Resources Information Centerĭescribes the features, equipment and operations of digital cameras and compares three different digital cameras for use in education.

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