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Paper key

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A paper key is a machine-readable print of a key. The printed key can be used to decrypt data, e.g. archives or 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 , a machine-readable print. Early implementations of a paper key by the company Safeberg use a . Safeberg Trusted paper key - 4.096 bits RSA key in a Datamatrix barcode or human-readable base 16 digits. "Paperkey - an OpenPGP key archiver" by David Shaw

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 or scan of their paper key and feeding it to cryptographic software that extracts the key to decrypt the data.

See also
  • Offline private key protocol

External links

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