Baseband Filter for Malicious RF Data Validation
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Solution Overview
Problem
Computing devices face the challenge of filtering out malicious radio frequency (RF)-based data received from baseband processors, which can compromise the device if not properly managed.
Innovation Solution
A baseband filtering system comprising a baseband processor, an application processor, and a baseband filter that inspects RF-based data for valid commands and operands, and determines whether to allow read or write operations based on associated baseband flags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF-based data is processed without filtering, then processing speed is maintained, but security is compromised due to malicious data
Solution Approach 1:
The baseband filter performs preliminary validation of commands and operands before they are processed by the application processor. By checking whether commands are in the restricted set and whether operands are within allowed size ranges in advance, the system prevents malicious data from reaching the application processor, thus improving security without requiring complex post-processing detection mechanisms
Solution Approach 2:
The filtering system is segmented into distinct functional components: command validation (checking if command is in restricted set), operand validation (checking if operand size is within allowed range), and baseband flag verification (checking memory access permissions). This segmentation allows each component to handle a specific aspect of security validation, making the overall system more manageable and efficient
2Reliability
If comprehensive filtering is implemented, then security is improved, but processing time increases
Solution Approach 1:
The baseband filter implements partial validation by focusing only on critical security parameters: command validity (is the command in the restricted set?), operand size range (is the operand within allowed limits?), and baseband flag status (is memory access permitted?). By validating only these essential aspects rather than performing exhaustive analysis on all data characteristics, the system achieves adequate security protection with minimal processing overhead
Solution Approach 2:
The filter replaces complex mechanical/security inspection processes with simpler logical comparisons: checking if command values match entries in a restricted set, comparing operand sizes against predefined ranges, and verifying baseband flag states. These logical operations are computationally efficient and can be executed rapidly, reducing time loss while maintaining security
3Adaptability or versatility
If all commands are allowed, then device functionality is maximized, but vulnerability to malicious commands increases
Solution Approach 1:
The system applies different quality controls to different aspects of command processing. The command field is subjected to strict validation (must be in restricted set), the operand field is validated for size constraints (must be within allowed range), and memory access is controlled via baseband flags. This localized quality control ensures that only authorized operations are permitted while maintaining flexibility for legitimate functionality within those constraints
Solution Approach 2:
The baseband filter acts as an intermediary between the baseband processor and the application processor. It mediates command execution by validating commands and operands against security policies (restricted command sets, operand size ranges, baseband flags) before allowing them to reach the application processor. This intermediary layer enables the system to maintain adaptable functionality for legitimate operations while blocking malicious commands
Data Source
AI summary
The present application describes systems and methods for filtering of malicious radio frequency (RF)-based data. A computing device includes a baseband filter configured to filter RF-based data. The baseband filter is configured to inspect information provided by the baseband processor before providing the information to other portions of the computing device, such as an application processor. In some examples, the baseband filter inspects a command and an operand in received RF-based data to determine the validity of the command and the operand. In some examples, if the RF-based data includes a read command to read a portion of memory, the baseband filter determines if the portion of memory is allowed to be read by (provided to) the baseband processor.