Methods for the generation of identical symmetrical cryptographic keys

• US 8,897,446 B2
• Filed: 09/11/2012
• Issued: 11/25/2014
• Est. Priority Date: 08/17/2007
• Status: Expired due to Fees

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Bichler, Daniel, Stromberg, Guido, Loew, Manuel, Barisic, Daniel, Krogmann, Martin, Lentsch, Thomas
• Primary Examiner(s): Tabor, Amare F
• Application Number:
  US13/610,339
• Publication Number:
  US 20130010956A1
• Time in Patent Office: 805 Days
• Field of Search: 380/28, 380/44, 380/259, 380/270
• US Class Current: 380/259
• CPC Class Codes: H04L 2209/805 Lightweight hardware, e.g. radio-frequency identification [RFID] or sensor
• CPC Class Codes: H04L 9/0872 using geo-location information, e.g. location data, time, relative position or proximity to other entities

Abstract

Methods and algorithms for generating identical symmetrical cryptographic keys. In a method for generating a symmetrical cryptographic key, a first profile is generated, the first profile comprising a series of data points collected over a first period of time. A start time of the first profile is identified and the first profile divided into a sequence of time-based segments, each time-based segment comprising at least one data point. A first symmetrical cryptographic key is calculated from the sequence of time-based segments, and the first symmetrical cryptographic key is stored for at least one of encrypting and decrypting data in cooperation with a second symmetrical cryptographic key substantially identical to the first symmetrical cryptographic key.

Claims

1. A method for exchanging cryptographically encoded data comprising:

obtaining a data profile by a sensing element integrated with a transceiver in each of a plurality of devices;

calculating an identical symmetrical cryptographic key from the data profile by the transceiver in each of the plurality of devices by

dividing the data profile into a plurality of sements,

determining a plurality of weight factors, one for each of the plurality of segments, by comparing, the plurality of segments with at least one sample,

providing the plurality of weight factors to a hash function,

combining the plurality of weight factors into a plurality of groups,

assigning a number to each of the plurality of groups, and

creating the identical symmetrical cryptographic key from the number assigned to each of the plurality of groups; and

using the identical symmetrical cryptographic key to encrypt and decrypt data in the transceiver in each of the plurality of devices, in communications among the plurality of devices.

2. The method of claim 1, wherein obtaining a data profile comprises:

applying a common physical stimulus to the plurality of devices; and

creating a data profile by the sensing element in each of the plurality of devices based at least in part on the common physical stimulus.

3. The method of claim 2, further comprising removably coupling the plurality of devices.

4. The method of claim 2, wherein applying a common physical stimulus further comprises shaking the plurality of devices, and wherein creating a data profile further comprises creating a three-dimensional acceleration profile.

5. The method of claim 2, wherein applying a common physical stimulus further comprises operating a vehicle to which the plurality of devices is related.

6. The method of claim 5, wherein creating a data profile further comprises creating an acceleration profile.

7. The method of claim 2, wherein creating a data profile further comprises creating an acoustic profite.

8. An algorithm encrypting and decrypting data communications, the algorithm executed within a transceiver and comprising:

creating, by a sensor integrated with the transceiver, a data profile front a physical input;

segmenting the data profile into a plurality of segments;

determining a plurality of weight factors, one for each of the plurality of segments, by comparing the plurality of segments with at least one sample;

providing the plurality of weight factors to a hash function executed within the transceiver;

combining the plurality or weight factors into a plurality of groups;

assigning a number to each of the plurality of groups;

creating a cryptographic key from the number assigned to each of the plurality of groups; and

encrypting data by the transceiver using the cryptographic key.

9. The algorithm of claim 8, further comprising decrypting data by the transceiver using the cryptographic key, wherein the data decrypted has been encrypted and transmitted by a second transceiver having an identical cryptographic key created according, to the algorithm.