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 based on first information extracted from the first image and first metadata associated with the first image; establishing a link between a second image and the first image; 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, 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.