Neopost Technologies

Lorenz R Frey

George M Brookner

In a secure cryptographic environment, a private key in a private/public key cryptographic scheme needs to be backed up and recovered in case of a loss or corruption of the private key. To back up the private key, multiple key segments are generated based on the private key which are distributed to a corresponding number of trusted individuals, each of whom has knowledge of only his or her key segment. The key can be restored only when all of the trusted individuals provide the respective key segments, based on which the original private key is reconstructed. In addition, each trusted individual is uniquely identifiable by a personal identification number. Advantageously, the private key which is secret can be backed up and restored without any individual having knowledge of the full key.

Technique for split knowledge backup and recovery of a cryptographic key

A method for securely generating a PIN comprises generating a number of random binary bits; determining the least significant bits of the number of bits; converting the least significant bits to a decimal integer; shifting the value of the integer by a predetermined constant to produce a shifted integer; and encoding the shifted integer as bits in a PIN block in accordance with a standard. A method for managing security of a PIN used to provide access to a secure device comprising choosing the PIN; storing an encrypted version of the PIN in the device; and communicating the PIN to a user of the device via a communication channel separate and apart from a channel reset to provide the device to the user. A method for resetting a PIN in a secure device comprising sending a message to a data center having an original PIN for the device, the message including authorization data indicative of at least one of the device and an authorized user of the device, and securely communicating the original PIN to the location of the device.

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Zuchwil, Switzerland

Lorenz R Frey