FPGA Memory Initialization Encryption for Secure IP Loading
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Solution Overview
Problem
The vulnerability of RAM-based on-chip memory in integrated circuits, such as FPGAs, to cloning and reverse-engineering due to volatile nature and predictable memory initialization data patterns, which exposes proprietary IP information during configuration and programming phases.
Innovation Solution
Encrypting memory initialization files using various encryption algorithms before assembling them into a configuration bit stream, which is then stored in non-volatile memory and decrypted upon loading, ensuring secure initialization and protection of IP data within the on-chip memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RAM-based on-chip memory is used for its volatile nature, then memory can be reconfigured and updated, but the memory content is wiped out every time the IC is powered down requiring re-loading of configuration bit stream which exposes IP information
Solution Approach 1:
The patent applies preliminary action by encrypting the configuration bit stream before it is stored or transmitted. The encryption is performed in advance during the configuration phase, so that when the bit stream is later loaded into the RAM-based on-chip memory, it remains protected. This resolves the contradiction by maintaining reconfigurability while preventing information exposure through pre-encryption of the configuration data.
2Ease of operation
If configuration bit stream is transferred from on-board memory to IC during programming phase, then IC can be configured, but design data is exposed and can be duplicated or reverse-engineered
Solution Approach 1:
The patent applies parameter changes by transforming the configuration bit stream from a readable, unprotected state to an encrypted, protected state. The encryption modifies the parameters of the data (adding cryptographic protection) while maintaining its functional integrity. This allows the IC to be configured normally while preventing cloning and reverse-engineering, as the encrypted data cannot be easily analyzed or duplicated.
3Productivity
If memory initialization data is placed at predictable locations in configuration bit stream, then initialization is efficient, but IP information can be extracted by examining these predictable locations
Solution Approach 1:
The patent applies asymmetry by introducing encryption that creates an asymmetric relationship between the encrypted configuration bit stream and the decryption key. The predictable locations of memory initialization data remain in the encrypted stream for efficient initialization, but the encryption layer creates an asymmetric barrier that prevents extraction of IP information. The data structure maintains its organizational efficiency while the cryptographic protection adds asymmetry that blocks analysis and extraction attempts.
Data Source
AI summary
A memory initialization file and one or more design files associated with configuring an IC are identified. The memory initialization file is encrypted using one or more encryption algorithms. A configuration bit stream is generated by compiling and assembling the encrypted memory initialization file and the one or more design files. During the programming phase, the configuration bit stream is received at the IC, decoded and logic design and content of encrypted memory initialization file are loaded into the respective logic elements and memory arrays of the IC. The IC then transitions into a user phase where the contents of the encrypted memory initialization file in the memory arrays are decrypted and validated at the on-chip memory within the IC to ensure that the integrity of the content is maintained. Upon successful verification of the integrity of the content, the content within the on-chip memory is available for processing.