为了更好地进行代码混淆,提出了一种基于混沌映射和二次映射的混沌不透明表达式构造方法.根据混沌不透明表达式的定义,采用具有初值敏感依赖性、伪随机性、状态空间均匀分布性、多分支性和无特殊符号等性质的混沌映射.以二维帐篷映射为例,创建与之相匹配的二次映射,将混沌映射的运行状态空间映射至表达式的结果空间,以进行混沌不透明表达式的构造.将混沌不透明表达式与不透明谓词相结合,形成了一种新的不透明谓词构造方法,同时提出了一种新构造谓词与原有谓词融合于一体的不透明谓词插入方法,两者结合形成了一种新型的不透明谓词混淆技术.实验结果表明,该技术令各项软件的复杂度指标都有明显的提升,并且增加的程序开销较小.%In order to improve the code confusion,a chaotic opaque expression construction method based on chaotic map and quadratic map was proposed.According to the definition of chaotic opaque expression,the chaotic map with the properties of initial value sensitive dependence,pseudo-randomness,uniform distribution of state space,multiple branching and non-special symbols is used.Taking two-dimensional tent map as an example,the matched quadratic map maps the running state space of the chaotic map to the result space of the expression to construct a chaotic opaque expression.Combining chaotic opaque expression with opaque predicate,a new method for constructing opaque predicate is formed.At the same time,an opaque predicate insertion method was proposed in which a new construction predicate is merged with an original predicate.The combination of the both forms a new opaque predicate obfuscation technique.The experimental results show that the technique has obvious improvement in various software complexity indexes,and the cost of the program is relatively lower.
展开▼
