Methods for the generation of identical symmetrical cryptographic keys

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.