Preventing digital forgery

An indication is received to export a file from a host having an authentication device. A memory buffer is allocated for a signature region, a header region, and a content region. A location stamp and a time stamp are calculated for content of the file. The location and time stamps are copied to the header region. An authentication signature is generated using a private key associated with the authentication device. The authentication signature is based on the header and content regions, which include the copied location stamp and timestamp, and content of the file. The authentication signature is copied to the signature region. The memory buffer is written to a new file, the new file being a signed version of the file and including the signature region having the authentication signature, the header region having the location and time stamps, and the content region having the content of the file.