US 12,632,610 B2 · Data-gating based masking

Abstract

A bundled-data protocol can be used to synchronize the data flow in the mask shares. A random synchronization token is input and “bundled” with the combinatorial logic of a share. An additional output from the combinatorial logic is also provided such that when the original combinational output is exclusive OR'd (XOR'd) with the additional output yields the random synchronization token. When the XOR of the original and additional outputs, and the input synchronization token are equal, it indicates that the computation of the combinatorial logic is complete. Thus, the result of the comparison of the XOR of the original and additional outputs, and the input synchronization token may be used as a “done” or “enable” handshake signal to allow asynchronous gating elements (e.g., AND gates, asynchronous set-reset latches, and/or state-holding elements like the Muller C-element, etc.) to start and stop the flow of data in a mask share.

Claims13

Dependent claims

An integrated circuit, comprising:

first masked circuitry to compute a first masked output value from at least a first share value and a second share value;
second masked circuitry to compute a second masked output value from at least a randomized first token value, the first share value, and the second share value;
first regeneration circuitry to compute a first regenerated token value;
and,
first enable signal circuitry to output a first enable signal based on the randomized first token value and the first regenerated token value.

2 more elements

Dependencies are inferred from the claim text.

Data-gating based masking

Life of this patent

Data-gating based masking

Life of this patent

Abstract

Claims13