In Dr. Ball’s blog, he smartly notes: “Application metadata resides within the file and moves with the file, not changing unless the contents of the file are altered. System metadata resides outside the file and can be altered without impacting the contents of the file. Hashing the file hashes its contents, not information about the file. That is, you only hash what’s stored inside the file, not its system metadata.” He also notes other points about how any hashing, and metadata cleaning, WOULD change the file.
RPost has set the standard for email proof, privacy, and electronic signatures globally. In 2009, the Colombian postal service 4-72, Colombia’s Digital Signature Certifying Authority – Certicamara, and the technology arm for Colombia’s Chambers of Commerce, teamed with RPost to launch RPost’s Registered Email™ service as the official certified electronic mail service – locally know as CertiM@il.