Method for testing tamper protection of a field device and field device having tamper protection
AssigneeSiemens Aktiengesellschaft
InventorRainer Falk
Life of this patent
Estimating the term…
Abstract
Testing tamper protection of a field device includes arrangement of at least one test element in the material of a housing of the field device. The test element is supplied with a first test signal, and the first test signal is measured for determining a physical fingerprint. The physical fingerprint is measured, and the test element is supplied with a second test signal. The second test signal is measured, and the second test signal is compared with the physical fingerprint. If the second test signal deviates from the physical fingerprint, a tamper signal is output.
Claims13
A method for testing tamper protection of a field device, the method comprising:
- arranging at least one test element in a sheath of an area of the field device to be protected;
- applying, via at least one contact area of the field device, a first test signal to the at least one test element;
- measuring the first test signal in order to determine a physical fingerprint of the sheath, the physical fingerprint of the sheath being at least partially defined by the arrangement of the at least one test element in the sheath of the area of the field device to be protected;
- storing the physical fingerprint;
- applying, via the at least one contact area, a second test signal to the test element;
- measuring the second test signal;
- comparing the second test signal with the physical fingerprint;
- and
- outputting, by the field device, a tamper signal indicating the physical fingerprint is changed when the second test signal differs from the physical fingerprint.
A field device having tamper protection, the field device comprising:
- a sheath;
- at least one test element that is arranged in the sheath;
- at least one test device for emitting, receiving, or emitting and receiving a test signal for the at least one test element;
- and
- at least one interface for transmitting the test signal,
- wherein the at least one test device is configured to compare a second test signal with a physical fingerprint of the sheath, the physical fingerprint of the sheath being at least partially defined by a first test signal and the arrangement of the at least one test element in the sheath of the field device,
- wherein the field device outputs a tamper signal when the second test signal differs from the physical fingerprint, the tamper signal indicating the physical fingerprint is changed.
Dependencies are inferred from the claim text.