Paper key

A paper key is a machine-readable print of a cryptographic key. The printed key can be used to decrypt data, e.g. archives or backup data. A paper key can be the result of an offline private key protocol. The offline private key can also function as a token in two-factor authentication.

The idea is that a digital key to decrypt and recover sensitive or personal data should have long-term durability and not be stored on any computer or network. The length of secure cryptographic keys restricts memorization, so the secret key takes the form of a 2D barcode, a machine-readable print. Early implementations of a paper key by the company Safeberg use a Data Matrix barcode.[1] or human-readable base 16 digits.[2]

The user stores the printed key in a secure location. To avoid abuse, the key can only be used in combination with a ‘normal’ password.

The user can extract the key by creating a digital photo or scan of their paper key and feeding it to cryptographic software that extracts the key to decrypt the data.

See also

External links

  1. ↑ Safeberg Trusted paper key - 4.096 bits RSA key in a Datamatrix barcode
  2. ↑ "Paperkey - an OpenPGP key archiver" by David Shaw


This article is issued from Wikipedia - version of the Monday, February 15, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.