In order to meet the requirements of electronic medical devices, it is necessary to collect physiological image data related to the human body. This highly sensitive personal data is encrypted and transmitted to remote monitoring devices or medical systems for processing and analysis. In scenarios involving the processing of large amounts of encrypted data, lightweight encryption algorithms are currently the most suitable approach, while maintaining the hardware architecture unchanged.

This improves the existing Advanced Encryption Standard (AES) architecture by incorporating the Secure Hash Algorithm 3 (SHA-3) hash function to modify the computation of the round keys. This enhancement increases the complexity of each round key, leading to higher security while reducing the number of rounds. Apart from avoiding the issue of repeated computation of round keys, the overall architecture enhances security while decreasing the time required to encrypt files, thereby improving the overall encryption throughput.
摘要 i
Abstract ii
目次 iii
表目次 v
圖目次 vi
第一章 緒論 1
1.1 簡介 1
1.2 研究動機 5
1.3 設計理念及貢獻 7
1.4 論文架構 10
第二章 背景知識及相關文獻 11
2.1 前言 11
2.2 高級加密標準(Advanced Encryption Standard, AES) 12
2.2.1 AddRoundKey 13
2.2.2 SubBytes 13
2.2.3 ShiftRows 14
2.2.4 MixColumns 15
2.2.5 金鑰擴展(Key Expansion) 16
2.3 SHA-3 (Secure Hash Algorithm 3) [8] 18
2.4 相關文獻 21
第三章 研究方法 23
3.1 設計構想 23
3.2 輕量化AES架構模型 25
3.3 金鑰拓展(Key Expansion) 27
3.4 Modified SubBytes 31
3.5 Modified ShiftRows 34
第四章 安全性分析與效能比較 37
4.1 概述 37
4.2 時間安全分析 39
4.3 雪崩效應安全分析 41
4.4 記憶體使用分析 59
4.5 執行速度與吞吐量 61
第五章 結論 66
參考文獻 67
附錄 72
1. 雪崩效應增加不同Input Key的測試結果 72
2. LRK-AES降低回合數目測試結果 78
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