Integrated SIM-PSAM Card for Secure Mobile Payments

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Solution Overview

Problem

Existing payment security systems rely on secure connections between terminals and back-end systems, limiting the use of unsecured public telecommunication infrastructure for financial transactions, and dedicated hardware requirements make it impossible for mass consumer devices like mobile phones to handle Point Of Sale (POS) applications.

Innovation Solution

A method and device that enable financial transactions over unsecured public telecommunication infrastructure by collecting and encrypting transaction data, creating a protocol message, and conveying it through channels like GPRS or SMS, using a combined SIM and Payment Security Application Module (PSAM) functionality in a standard SIM card form factor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dedicated hardware with separate PSAM chip and SIM card is used, then payment security is improved, but device complexity and cost increase

Engineering Contradiction:

Improvepayment securityVSAvoidhardware structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the PSAM chip and SIM card into a single integrated SIM card form factor. The SIM card is modified to include both the subscriber identity module functionality and the payment security application module functionality, eliminating the need for separate hardware components while maintaining security requirements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The SIM card is designed to perform multiple functions: it serves as both the subscriber identity module for mobile network authentication and the payment security application module for financial transactions. This multi-functional design allows a single device to handle both communication and payment security operations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If unsecured public telecommunication infrastructure is used, then ease of operation is improved, but reliability deteriorates

Engineering Contradiction:

Improvenetwork accessibilityVSAvoidtransaction security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces an encrypted transaction token as an intermediary mechanism. Instead of transmitting sensitive payment data directly over the unsecured network, the system creates an encrypted token that serves as a secure representation of the transaction information, allowing safe communication over public infrastructure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent transforms the transaction data by encrypting it and converting it into a token format before transmission. This parameter change from plaintext to encrypted token ensures that even though the network is unsecured, the transmitted data remains protected and cannot be easily intercepted or modified.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11423385B2Method of performing a financial transaction via unsecured public telecommunication infrastructure and an apparatus for same

Publication Date: 2022.08.23 MAYA INNOVATIONS HOLDINGS PTE LTD

AI summary

An apparatus comprises at least one integrated circuit. The apparatus has a size and shape substantially similar to an ordinary Subscriber Identification Module (SIM) card. The at least one integrated circuit comprises a memory storing first software that, when executed, causes the card to communicate with second software stored on the device. The second software, when executed, causes the device to provide both a SIM and Payment Security Application Module (PSAM) functionality to a user of the device.