Here's a nice piece by John Markoff on some of the authentication and archival problems arising from the digital age.
Both because of the rapid pace of innovation and the tendency of computers to wear out in months or years, the likelihood that digital files will be readable over long periods of time is far less certain even than the survival of paper documents. Computer processors are quickly replaced by incompatible models, software programs are developed with new data formats, and digital storage media, whether digital tape, magnetic disk or solid state memory chips, are all too ephemeral.
[From A Tool to Verify Digital Records, Even as Technology Shifts - NYTimes.com]
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