Toner Cartridge Authentication Using Elliptic-Curve Challenge Response
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Solution Overview
Problem
Existing methods struggle to effectively authenticate components in electronic systems, particularly in imaging devices, as non-authentic components can mimic authentic behavior, leading to operational issues and security vulnerabilities that worsen over the system's lifecycle.
Innovation Solution
A method using elliptic curve cryptography is employed to authenticate components, where a random integer is generated and used to calculate a point on an elliptic curve, with a bitmask masking certain bits, iteratively calculating a point with varying integers, and comparing results to determine authenticity, allowing for flexible complexity increases over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional encryption schemes are implemented on non-authentic components using firmware, then it becomes easier to produce non-authentic components that pass authentication, but security is compromised
Solution Approach 1:
The patent changes the fundamental parameter of authentication from software-based encryption to hardware-based elliptic curve cryptography. By requiring specific hardware capabilities to perform ECDSA operations, the system makes it infeasible to replicate authentication using simple firmware, thus resolving the contradiction between ease of manufacture and security reliability.
Solution Approach 2:
The patent replaces the software/firmware-based encryption mechanism with a hardware-based cryptographic system. The authentic component must have dedicated hardware circuitry capable of performing elliptic curve cryptographic operations, substituting the software approach that non-authentic components could easily replicate.
2Extent of automation
If a security component checks the authenticity of multiple components and carries out many other functions, then processing requirements increase, but system complexity and processing time worsen
Solution Approach 1:
The patent extracts the complex authentication processing from the central security component and distributes it to individual supply components. Each supply component independently performs ECDSA signature verification using its own embedded cryptographic hardware, eliminating the need for the security component to perform complex cryptographic operations on multiple components.
Solution Approach 2:
The patent implements self-service authentication where each supply component autonomously verifies its own authenticity through embedded cryptographic hardware. The component performs self-checks and provides cryptographic proofs without requiring extensive processing from external security components, reducing overall system complexity.
3Duration of action of moving object
If non-genuine supply items have shorter lifecycles than imaging systems, then hardware in non-genuine items may increase in power dramatically, but any security method becomes obsolete over time
Solution Approach 1:
The patent implements dynamic adaptability through configurable bitmask parameters that can be updated via over-the-air updates. The bitmask controls which bits of the random integer are masked during authentication, allowing the security complexity to be dynamically adjusted over time to counter evolving threats without requiring hardware changes.
Solution Approach 2:
The patent changes security parameters (bitmask configuration) over time through software updates. By modifying the bitmask parameters that control authentication complexity, the system can adapt to new threats and extend the effective lifecycle of the security method without requiring hardware replacement.
Data Source
AI summary
A method of determining the authenticity of a replaceable toner cartridge in a printing device using an elliptic curve E defined over a finite field Fq, where q is an integer, the method comprising: the printing device generating a random integer j, where the random integer j is in the interval of one to the integer q; the printing device calculating a point T=j·S, where point S is a point on elliptic curve E(Fq); the printing device calculating a binary value k which is equal to the binary random integer j with a bitmask m applied thereto; the printing device sending point T and binary value k to the replaceable toner cartridge; and the replaceable toner cartridge iteratively calculating point U=n·S for different values of integer n, where for each iterative calculation integer n takes different values.