A new technique enables you to authenticate the text (or other mobile phone) message record with a voice signature. A service called My Electronic Evidence lets you memorialize an electronic record (like a record of a text, photo, video or e-mail message) with a date, a voice statement and a notation about where you think the message came from and how you preserved it.
To use the service, you need to store the content of the text message in a computer file like a pdf, a doc or a jpg. Then you upload the file (or if you're a techie, a hash of the file) to the service, and you record a statement about where the evidence came from, how you captured it and so on. The service calculates a "signature code" for the file. Then it allows you to speak a voice statement that says you sign the evidence, together with the "signature code" as of a stated date. Finally, the service sends you a self-explanatory archive showing that you authenticated the evidence with your unique voice.
If after that the evidence file is changed, it will no longer match the signature code contained in your dated voice record. Thus the service reliably links you (as evidence collector) to the evidence and establishes the existence of the evidence as of a date. This information can be invaluable when assessing evidence months or years later, such as in a lawsuit, when memories have faded or possibly when you are no longer available to vouch for the evidence.
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