A digital signature uses a public key to verify that a data item has not been altered.
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Video notes: cys.me/vid/c12
Video #13 shows how to validate a public-key certificate vimeo.com/208878583
The previous video introduces public-key certificates for authenticating web sites vimeo.com/208069671
See the entire Cryptosmith series in its album Cryptosmith Series
V2, Updated 2 April 2017