Secure Point of Sale Terminal Tamper Detection

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Solution Overview

Problem

Current secure keypad devices lack effective anti-tamper mechanisms to prevent unauthorized access and physical tampering, which can compromise data entry security.

Innovation Solution

A secure keypad device design featuring a housing with case-open switches and tamper indication circuitry, including concentric electrical contacts and anti-tampering electrical conductors, which detect and prevent unauthorized access by ensuring electrical contact only when the housing is closed, triggering an alarm or disablement upon attempted tampering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional keypad devices are used, then the device structure is simple, but unauthorized access and physical tampering can compromise data entry security

Engineering Contradiction:

Improvesecurity against unauthorized accessVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The housing is divided into multiple portions (first housing portion and second housing portion) that can be separated. The case-open switch assembly is segmented into multiple electrical contacts (first, second, and third contacts) arranged concentrically, allowing independent detection of different tampering conditions without requiring a completely complex redesign of the entire device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The third contact is nested between the first and second contacts in the concentric arrangement. The anti-tampering electrical conductors are embedded within the housing structure itself, nesting security features within the existing device architecture rather than adding separate external layers.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If case-open switch assembly with multiple contacts is used, then tamper detection capability is improved, but the device complexity increases

Engineering Contradiction:

Improvetamper detection capabilityVSAvoidelectrical contact arrangement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple detection functions are merged into a single case-open switch assembly with concentric contacts. The first contact detects normal closure, the second contact detects housing opening, and the third contact detects tampering attempts - all within one integrated assembly rather than separate switch components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The concentric contact arrangement serves multiple functions simultaneously: the first contact provides normal operational switching, the second contact provides housing open/closed detection, and the third contact provides tamper detection. This multi-functional design reduces the need for separate detection mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If anti-tampering electrical conductors are added between housing portions, then security against unauthorized access is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvesecurity against unauthorized accessVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Anti-tampering electrical conductors are added only in specific critical locations between the first and second housing portions, rather than throughout the entire device. This localized approach provides security where needed while minimizing the impact on overall manufacturing complexity.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides enhanced security by preventing unauthorized access and detecting physical tampering, ensuring the integrity of data entry operations and maintaining the device's secure state.

Implementation Method 1

at least one case-open switch assembly operative to sense when the housing is opened and tamper indication circuitry operative to receive an input from the at least one case-open switch assembly

Methodology Applied

Scientific EffectElectrical contact sensing: Conduction (electrical)

Implementation Method 2

the at least one case-open switch assembly including an arrangement of electrical contacts including at least first, second and third contacts and a displaceable conductive element, which defines a short circuit between the first and second contacts only when the housing is closed

Methodology Applied

Scientific EffectElectrical short circuit prevention: Conduction (electrical)

Data Source

PatentUS9032222B2Secure point of sale terminal

Publication Date: 2015.05.12 VERIFONE INC

AI summary

A data entry device including a housing formed of at least two portions, data entry circuitry located within the housing, at least one case-open switch assembly operative to sense when the housing is opened and tamper indication circuitry operative to receive an input from the at least one case-open switch assembly and to provide an output indication of possible tampering with the data entry circuitry located within the housing, the at least one case-open switch assembly including an arrangement of electrical contacts including at least first, second and third contacts and a displaceable conductive element, the tamper indication circuitry and the third contact together being operative such that when the third contact is short circuited to at least one of the first contact, the second contact and another contact, an output indication of possible tampering is provided.