Patent Document ID: 9779284
Application ID: 14108477
Patent Status: 1

Claim One:
1. A method for preserving privacy of evidence comprising: receiving an encrypted first image which has been generated by encrypting a first image with a symmetric cryptographic key that is generated by encrypting, with a one way function, first information extracted from the first image and first metadata associated with the first image and signing the encrypted first information and first metadata with a shared key, wherein the first metadata comprises a first time; establishing a link between a second image and the first image comprising comparing a first visual signature computed based on the first image with a second visual signature computed based on the second image, each of the first and second visual signatures being a statistical representation of pixels of the respective image; when the visual signatures are found to match, receiving the first metadata; extracting second information from the second image; reconstructing the symmetric cryptographic key that was used to encrypt the first image based on the second information extracted from the second image and the first metadata, by encrypting, with the one way function, the second information and the first metadata and signing the encrypted second information and first metadata with the shared key, the reconstructed symmetric cryptographic key permitting the first encrypted image to be decrypted to regenerate the first image, wherein at least one of the establishing a link between a second image and the first image and the reconstructing of the symmetric cryptographic key is performed with a processor.