AES Encryption Key Obfuscation via Multi-Table XOR Transformations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional AES encryption schemes may fail to adequately obfuscate key data, making it vulnerable to decryption.
Innovation Solution
An information processing apparatus that uses a processor and memory to perform a series of transformations on data using exclusive OR operations with randomly generated components and key data, stored in specific tables, to obfuscate the key data during encryption and decryption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AES encryption scheme is used, then encryption/decryption can be performed, but key data may be decrypted and is not adequately obfuscated
Solution Approach 1:
The encryption process is divided into multiple distinct transformation stages: first transformation using a first table with mixed components, second transformation using a second table, third transformation using a third table, and final XOR calculation. Each transformation segment performs a specific function to progressively obfuscate the key data, preventing straightforward decryption while maintaining cryptographic security.
Solution Approach 2:
Multiple intermediate transformation tables (first table, second table, third table) are introduced as mediators between the input data and final encrypted output. These intermediary tables with randomly generated mixed components complicate the encryption path, making it difficult to reverse-engineer the key data while still producing valid AES encryption.
2Reliability
If multiple transformation tables with random components are used to obfuscate key data, then security is enhanced, but the encryption process becomes more complex
Solution Approach 1:
Multiple cryptographic operations (XOR with random components, table lookups, permutations) are merged into a unified multi-table transformation process. The first table, second table, and third table each contain pre-computed mixed components that combine multiple cryptographic operations, reducing the need for separate execution steps while maintaining security.
Solution Approach 2:
The transformation tables are pre-computed and stored with randomly generated mixed components before the actual encryption operation. This preliminary preparation allows the runtime encryption process to simply perform table lookups and XOR operations, enhancing obfuscation effectiveness without significantly increasing computational complexity during execution.
Data Source
AI summary
An information processing apparatus for encrypting or decrypting data by AES scheme, includes a processor; and a memory storing a first table including mixed components based on exclusive OR of first random components and key data, a second table, and a third table. The processor executes selecting four bytes of sub-round data from the data; a first transformation based on the first table, for each of one-byte data items of the sub-round data, to generate first data by taking exclusive OR of the one-byte data items and the mixed components; a second transformation based on the second table to transform the first data into second data; a third transformation based on the third table to transform the second data into multiple items of third data; calculating exclusive OR of the third data.