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Your search keyword '"Cai, Jiajin"' showing total 9 results
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9 results on '"Cai, Jiajin"'

6. Poster

Author

Yang, Ruiguo, primary, Cai, Jiajin, additional, and Han, Xinhui, additional

Published
2022
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7. ReDex: Unpacking Android Packed Apps by Executing Every Method

Author

Xinhui Han, Tongxin Li, Cai Jiajin, and Can Huang

Subjects
Unpacking, 021110 strategic, defence & security studies, Reflection (computer programming), Source code, Database, Java, Computer science, business.industry, media_common.quotation_subject, 0211 other engineering and technologies, 020207 software engineering, Crash, 02 engineering and technology, computer.software_genre, Encryption, 0202 electrical engineering, electronic engineering, information engineering, Malware, Android (operating system), business, computer, computer.programming_language, media_common
Abstract

In recent years, Android commercial packers have been widely used to encrypt dex files of apps, making analysts and malware detection solutions hard to obtain the actual dex files for further analysis. Therefore, we propose a novel unpacking system named ReDex. ReDex uses Java reflection to execute all methods with forged arguments and collects the original instructions when the method is executing. Although apps may crash due to forged arguments, ReDex can collect its original instructions released by the commercial packer before the crash. Also, we design an exception/crash handling module, which can avoid most of the crashes and restart the unpacking process at the next method after the crash. The comparison with 2 state-of-the-art unpackers on 100 packed apps with source code and 140 wild packed apps shows that ReDex can unpack more apps. Besides, we conduct an experiment with 1,801 real-world apps packed by 7 representative packers. Of 21 million methods, ReDex can extract 19,239,743 (90.30%) methods. The exception/crash handling module effectively reduces the crash rate to 2.31%. In these packed apps, we find 4 interesting packing techniques. ReDex can deal with these packing techniques while 2 state-of-the-art unpackers cannot.

Published
2020

9. Efficient H2O2 Synthesis through a Two-Electron Oxygen Reduction Reaction by Electrocatalysts.

Author

Chen H, Chen R, Liu S, Zhou Y, Chen X, Cai J, Lan X, Jiang H, Lin L, and Sun Z

Abstract

The two-electron oxygen reduction reaction (2e-ORR) for the sustainable synthesis of hydrogen peroxide (H2O2) has demonstrated considerable potential for local production of this environmentally friendly chemical oxidant on small, medium, and large scales. This method offers a promising alternative to the energy-intensive anthraquinone approach, placing a primary emphasis on the development of efficient electrocatalysts. Improving the efficiency of electrocatalysts and uncovering their catalytic mechanisms are essential steps in achieving high 2e-ORR activity, selectivity, and stability. This comprehensive review summarizes recent advancements in electrocatalysts for in-situ H2O2 production, providing a detailed overview of the field. In particular, the review delves into the design, fabrication, and investigation of catalytic active sites contributing to H2O2 selectivity. Additionally, it highlights a range of electrocatalysts including pure metals and alloys, transition metal compounds, single-atom catalysts, and carbon-based catalysts for the 2e-ORR pathway. Finally, the review addresses significant challenges and opportunities for efficient H2O2 electrosynthesis, as well as potential future research directions., (© 2024 Wiley‐VCH GmbH.)

Published
2024
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