Patent ID: 9483664
Filing Date: 2016-11-01
CPC Classification: G06F,G09C,H04L

Claim Text:
1. A method of manufacturing a plurality of devices, comprising: manufacturing, in each of the devices, key generation circuitry to generate a key as a function of an address of a storage location of a memory, and encryption circuitry to encrypt unencrypted data to form encrypted data as a function of said key; wherein the key generation circuitry comprises physically unclonable function circuitry to receive said address as a challenge input to said physically unclonable function circuitry, and to output said key as a response output from said physically unclonable function circuitry, the method further comprising: manufacturing the devices with device-to-device variation of the physically unclonable function circuitry such that the key generation circuitry of a first device is configured to generate a different key to the key generation circuitry of a second device even when the same input data is supplied to the key generation circuitry of the first device and the second device.