Patent ID: 7907735
Filing Date: 2011-03-15
Classification: H04K,H04L

Abstract:
1. A method of deriving at least one multiparty cryptographic key for use by at least three computing devices and encrypting data transferred between the at least three computing devices, comprising: receiving, from the first computing device, an authentication packet comprising a first random number encrypted using the secret key for the first computing device and an identification number for the first computing device; retrieving, from a database, a stored secret key for the first computing device using the device identification number for the first computing device; decrypting the first random number using the stored secret key; generating a second random number; and generating the first base cryptographic key using the first random number and the second random number; generating a multiparty cryptographic key; determining a first offset between the multiparty key and the first base cryptographic key; encrypting the first offset using the first base cryptographic key; and communicating the encrypted first offset to the first computing device.