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Gray box is a kind of device in which the working process of a program or system is locally recognized. Gray box testing, also known as gray box analysis, is a software debugging method based on the limited cognition of the internal details of the program. Testers may know how system components interact with each other, but they lack a detailed understanding of internal program functions and operation. So the construction of gray box is particularly important. The most original gray boxes are static debugger and dynamic debugger. And then reflexion model, which reduces the manual work greatly, is developed and applied. The latest gray boxes are focus on regarding instructions as a natural language using the mature mathematical model to mine their internal value. Adhering to the idea of latest researches, our paper improves the original suffix tree and use the improved suffix tree as a mathematical models to analyse and visualize the internal logic of instructions. Our gray box aims at solving three problems in practical application. In addition, we explain the complexity of instruction sequence and put forward a prediction formula for the building part. By experiment, we prove the time complexity of each part and the correctness of the prediction formula, and show the effect of visualizing part.

A Gray Box for Visualizing Instruction Sequence Based on Improved Suffix Tree