Abstract
When doing reverse analysis of program’s binary codes, it is often to encounter the function of cryptographic library. In order to reduce workload, a cryptographic library model has been designed by analysts. Models use formalized approach to describe the frame of cryptology and the structure of cryptographic function, complete the mapping from cryptographic function property to its architecture, and accomplish the result presentation of data analysis and mapping at last. The model can solve two problems: the first one is to know the hierarchy of the cryptographic function in the library well; the second one is to know some kinds of information, such as related cryptology algorithm and protocol, etc. These function implements can display the result graphically. The model can find relevant knowledge for the analysts automatically and rapidly, which is helpful to the learning of the overall abstract structure of cryptology.
Highlights
The cryptographic algorithms and protocols are often used in many fields, such as protection of network data transmission, software shelling, code obfuscation and electronic commerce [1] [2]
The difficult point of software reverse engineering is the reverse analysis of cryptographic algorithms in software, and the mains analysis methods are based on the characteristics of cryptographic algorithm, library signature and dynamic tracing, etc
Main Chain Parameters: The cryptographic algorithm or protocol information which is included in current function exists in the parameter or the function derived from the parameter, which is marked as SYSTEM. mainLink
Summary
The cryptographic algorithms and protocols are often used in many fields, such as protection of network data transmission, software shelling, code obfuscation and electronic commerce [1] [2]. The research on dynamic trace has become the hotspot of research [9] [10] These methods are novel and effective in theory and practice, and their research findings are of reference value. It can restore part of information (data or cryptographic key) of the algorithm, but cannot give the call chain relationship of function in algorithm and the process of matching and corroboration of it is too time-consuming. This paper puts forward a cryptographic description architecture and a description method of library architecture which are specific to the cryptographic library, so as to recover the relation between algorithmic information and function calling chain when the library function is used in the program
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