Contactless Chip Card Security via Anti-Collision Phase Encoding
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Solution Overview
Problem
Contactless chip card systems face security vulnerabilities due to the inability to simultaneously communicate with multiple cards, making them susceptible to eavesdropping and unauthorized access, as existing anti-collision methods can be circumvented by attackers.
Innovation Solution
A method where a first security module encodes information within responses to anti-collision queries, allowing a second security module to decode and authenticate, ensuring secure communication without altering existing system parameters or architecture, using the anti-collision phase to transmit information between security modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocker tags are used to prevent unauthorized access during anti-collision phase, then security against eavesdropping is improved, but attackers can circumvent protection by identifying and accessing the payment card using different methods
Solution Approach 1:
The patent applies preliminary action by performing the information transfer during the anti-collision phase, before the main communication phase begins. The first security module encodes and transmits necessary information to the second security module while both are in the anti-collision phase, ensuring that the payment card is already authenticated and protected before any subsequent communication occurs. This prevents attackers from circumventing security by intercepting later communication phases.
Solution Approach 2:
The patent introduces an intermediary mechanism by using the anti-collision phase itself as a secure communication channel. Instead of relying solely on blocker tags that may be circumvented, the system uses the existing anti-collision protocol as a mediator to transfer authenticated information from the first security module to the second security module, creating a more robust security layer that is integrated into the fundamental communication protocol.
2Ease of manufacture
If information is transmitted during anti-collision phase, then secure data exchange is achieved without structural changes, but the complexity of encoding and decoding information increases
Solution Approach 1:
The patent applies universality by making the anti-collision phase serve multiple functions: its original card identification function plus an additional secure information transfer function. By encoding information within the existing anti-collision query-response protocol, the system reuses the same communication channel for dual purposes, avoiding the need for separate dedicated communication channels or structural modifications to the RFID infrastructure.
Solution Approach 2:
The patent applies parameter changes by modifying the data content and encoding format of the anti-collision responses without changing the fundamental protocol structure. The first security module encodes additional information parameters within the existing response frames, and the second security module decodes these parameters using complementary encoding schemes, thereby transmitting secure data through parameter manipulation rather than protocol restructuring.
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
Enhances security and usability by preventing unauthorized access and eavesdropping, allowing secure data exchange without requiring structural changes to existing systems, while maintaining compatibility with existing infrastructure.
Implementation Method 1
Due to the further development of security modules in the form of chip cards and the use of RFID (Radio Frequency Identification), the use of chip cards for contactless data transmission has increased.
Data Source
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AI summary
The invention relates to a method for transmitting information from a first safety module (200) to a second safety module (300) in a system comprising the first and the second safety module (200, 300). An anti-collision phase includes a sequence of anti-collision requests, and the anti-collision phase is followed by a communication phase. The first safety module (200) transmits the information to be transmitted to the second safety module (300) in the anti-collision phase by transmitting responses of the first safety module (200) in the sequence of the anti-collision requests, said information to be transmitted being coded into the responses of the first safety module (200). The second safety module (300) decodes the information to be transmitted from the sequence of received anti-collision requests. The invention further relates to a first and a second safety module (200, 300), in particular for transmitting information.