a secure storage device for securing digital camera data at the acquisition stage . original digital camera data is saved in the memory of the secure storage device which has the capability of performing one or more security functions , including encryption , creation of an authentication file , adding data to the image data such as fingerprinting , and adding secure annotations such as separate data included in an image - header . the device prepares original authentication data from original digital camera data , and encrypts and stores both the original authentication data and the original image data . the use of the device includes downloading the original image data to a first computer , and encrypted original authentication data to a second computer .