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Student Number 91522066 Author Yuan-Han Kuo(³¢»·¿«) Author's Email Address No Public. Statistics This thesis had been viewed 2111 times. Download 780 times. Department Computer Science and Information Engineering Year 2003 Semester 2 Degree Master Type of Document Master's Thesis Language English Title The Research of Power Analysis against AES Date of Defense 2004-06-07 Page Count 80 Keyword AES DPA Physical cryptanalysis Power analysis attack Smart cards SPA Abstract Nowadays, digital information grows extremely in our daily life, and the requirement of tamper-resistant device that endowed with executing the procedures of cryptosystems or storing the ersonal

secret information increases correspondingly. The smart cards are becoming the representative of tamper-resistant device. However, when these cryptosystems are operated in the open environment, no one can ensure the security of information even information is protected by cryptosystems. Physical cryptanalysis is a modern and increasingly potent threat to the security of information held on smart cards. By measuring physical features such as power consumption, time spending or electromagnetic emission, the attackers can infer secret information from smart cards with naive implementations of cryptosystems.

The Advanced Encryption Standard (AES) is the next generation standard block cipher selected by NIST to replace DES in 2000. AES will become the most widespread block cipher standard. Power

analysis attack is the most useful cryptanalysis at present, and it is also practicable on the AES. In this thesis, the power analysis against AES will be discussed.

The simple power analysis (SPA) is easy to realize in real world. In order to defend the AES against SPA, the weakness of existence SPA-resistant countermeasures are analyzed, and an

improvement is proposed. Second, the DPA-resistant algorithms of AES suffer from high-order differential power analysis (HODPA). To

this end, possible countermeasure is also discussed.

The balanced Hamming weight scheme is one of the effective ways to prevent from power analysis attack. We found that even involving the balanced Hamming weight to protect AES, it may not secure enough under some careless implementations. The weaknesses of balanced Hamming weight scheme will be analyzed and the procedure of the proposed flipping DPA attack is described to derive the secret key of AES.

In this thesis, the experiments will be shown at the end of each proposed method to confirm our contentions. Some experiments, especially the SPA-based attack, the power trace will be pre-process before analyzing. At the end of this thesis, the

pre-process technique will be described.Table of Content {1}Introduction{1}

{1.1}Motivation{1}

{1.2}Power Analysis on AES{2}

{1.3}Overview of the Thesis{4}

{2}Review of Power Analysis Attack and AES{6}

{2.1}Review of Power Analysis Attack{6}

{2.1.1}Simple power analysis{6}

{2.1.2}Differential power analysis{7}

{2.1.3}High-order differential power analysis{9}

{2.2}Review of AES: the Rijndeal Cipher{10}

{2.2.1}Round transformation{11}

{2.2.2}Key expansion of Rijndael{12}

{2.3}Examinations of Power Analysis against AES{14}

{2.3.1}Experimental setup{14}

{2.3.2}DPA against AES{14}

{3}Improvements of AES against Power Analysis Attack{17}

{3.1}Motivation{17}

{3.2}An Improvement of MixColumn against SPA{18}

{3.2.1}SPA attack on MixColumn operation{18}

{3.2.2}Possible countermeasures{19}

{3.2.3}Experimental results{21}

{3.3}An Improvement of Masking Method against High-Order DPA{22}

{3.3.1}Review of masking method on AES{24}

{3.3.2}Proposed algorithm against HODPA{28}

{3.3.3}Discussion{31}

{3.4}Summary{33}

{4}Flipping DPA Attack against AES{35}

{4.1}Motivation{35}

{4.2}Software Balanced Hamming Weight Schemes{36}

{4.3}Analyses of Flipping Model{37}

{4.3.1}Akkar's flipping model{38}

{4.3.2}Analysis of KeyAddition on flipping model{38}

{4.4}Flipping DPA Attack Procedures{39}

{4.5}Experimental Results{43}

{4.6}Discussions{44}

{4.6.1}The disadvantage of balanced Hamming weight scheme{44}

{4.6.2}Hamming weight leakage from loading the secret key{44}

{5}Enhancement of Power Analysis Attack{48}

{5.1}Motivation{48}

{5.2}Frequency Domain Analysis{49}

{5.3}Basic Idea of Digital Filter Design{52}

{5.3.1}Digital transfer functions{53}

{5.3.2}Digital filter implementations{55}

{5.4}Applications of DSP on Power Analysis Attack{56}

{5.4.1}Frequency domain analysis of power trace{57}

{5.4.2}Filtering technique on power analysis{57}

{5.4.3}Design an appropriate filter for DPA{59}

{6}Conclusions{63}

{6.1}Brief Review of Main Contributions{63}

{6.2}Further Research Topics and Directions{64}Reference [1]

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