Nonvolatile Memory Hacking Detection Circuit
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Solution Overview
Problem
Recent increases in hacking attempts pose a threat to the security of flash memory devices, which are commonly used in various electronic devices, as existing technologies lack effective mechanisms to detect and respond to unauthorized access sequences.
Innovation Solution
A nonvolatile memory device is designed with a hacking detection circuit that analyzes access sequences and disables operations when an unauthorized sequence is detected multiple times, utilizing a control circuit and voltage generator to block access paths and store recovery codes, incorporating a PMOS transistor and fuse switches for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hacking detection circuit is added to analyze access sequences, then security against unauthorized access is improved, but device complexity increases
Solution Approach 1:
The control circuit is divided into functional modules: a command decoder for interpreting commands, an access sequence analyzer for detecting unauthorized patterns, a counter for tracking violations, and a hacking detection signal generator for triggering responses. This segmentation allows each component to perform a specific security function independently, improving overall security while keeping individual module complexity manageable.
Solution Approach 2:
The system pre-establishes a standard access sequence and stores it in the memory cell array. Before actual access operations occur, the system has the capability to compare incoming access sequences against this pre-stored standard, enabling proactive security detection rather than reactive response. The counter is also pre-configured with a reference value to automatically trigger security measures when thresholds are exceeded.
2Reliability
If the hacking detection circuit disables operations upon detecting unauthorized access, then security is improved, but ease of operation deteriorates due to operational interruptions
Solution Approach 1:
The system implements a feedback mechanism where the access sequence analyzer continuously monitors access patterns and provides information to the counter and signal generator. When unauthorized access is detected, the system generates a hacking detection signal that triggers a disable operation. This feedback loop ensures that operational disruptions only occur when genuinely suspicious patterns are identified, balancing security with operational continuity.
Solution Approach 2:
The system changes the operational state parameter of the nonvolatile memory device based on security conditions. Under normal conditions, the device operates with standard access permissions. When the counter exceeds the reference value indicating potential hacking, the system transitions to a disabled state parameter, blocking further access. This parameter change approach allows the system to maintain ease of operation during normal use while enforcing security restrictions only when necessary.
Data Source
AI summary
A nonvolatile memory device includes a memory cell array, a voltage generator, and a control circuit. The voltage generator generates word-line voltages to be applied to the memory cell array. The control circuit generates control signals that control the voltage generator in response to a command and an address. The control circuit includes a hacking detection circuit. The hacking detection circuit disables an operation of the nonvolatile memory device when a hacking is detected, wherein the hacking is detected when an access sequence of the command and the address does not match a standard sequence of the nonvolatile memory device a consecutive number of times.