| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 90 === Nowadays, digital information grows extremely in our daily life, and the importance of information security increases correspondingly. People always protects information transferred in the untrusted channel from leakage by cryptographic algorithms. However, when these cryptosystems are operated in the open environment, no one can ensure the ecurity of information even information is protected by cryptosystems.
The Advanced Encryption Standard (AES) selected by NIST of the United States will become the most widespread block cipher standard. In this thesis, its strength against physical cryptanalyses, specially the power analysis and the differential fault analysis will be discussed.
In Chapter 4, an application of the differential fault analysis on the AES are considered. In order to defend the AES from this attack, the
weakness of the AES are analyzed, and some mprovement of the AES structures are proposed. Finally, in order to defend the AES against the timing attack, possible countermeasure is also discussed.
Power analysis attacks are the most useful cryptanalyses at present, and it is also practicable on the AES. In Chapter 5, two types of power analyses attack on the AES are proposed. Similarly, in order to defend against power analyses, some countermeasures are considered, and some problems about the countermeasures are also discussed.
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