Digital signing
This is in response to the NY Times article about archiving and crypto hashes:
The article presents this as being “new� technology, when in fact it is very mature technology. Hashing is a wonderful tool for digital signing. It is in extensive use by many software distributors as a sure-fire way of verifying that a piece of software is not corrupt or tampered with. As a core technology, hashes and crypto are bulletproof. The trouble lies in the implementation.