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Photo: A. Reinkober / pixelio.de |
I recently met somebody who had a signet ring and suddenly realized that this is a very early form of 2-factor-authentication (2FA):
Signet Ring | 2FA |
Unique | Unique |
Difficult to copy | Supposedly impossible to copy |
Seal proves personal involvement of bearer | 2FA token proves personal interaction of owner |
The main difference is of course that 2FA is commonly available to everybody who needs it while signet rings where and remain a special feature. But it is still nice to know that the basic idea is several thousands years old.
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