Abstract: The object of the study is technology of hiding method calls. Hidden calls are need to hide: entity dependencies; data processing logic; algorithms. The methods used to complete the task are limited by language technologies and its performance. Method can be called directly and indirectly: via the bootstrap method; from native code (JNI); using Reflection; using JRE 1.7, InvokeDynamic. The examples with source code are given. The authors conclude that the most promising methods among considered is invokedynamic technology. The study  present analysis of such methods as the bootstrap method, calling method from through native code, obfuscation calls via Reflection and InvokeDynamic. The article discusses various ways to conceal the method invocation. The characteristic features of obfuscation for most popular ones are reviewed. The most promising among the discussed methods is  invokedynamic technology. It allows completely removing method signature from the source code, leaving only the service information for the bootstrap method. With proper implementation of the bootstrap method it is possible to create bytecode, which will be impossible to decompile into valid Java code, Groovy's or Scala.

Abstract: Methods and techniques allowing to calculate quantitative estimates of level of protection from unauthorized physical intrusion for different informatization objects using various means and protection systems are currently being intensively developed. Generally the quantitative evaluation of protection is represented by a set of probability characteristics, the predominant of which is some integral indicator. Therefore, developing mathematical and simulation models for calculating an estimate of informatization object protection from unauthorized physical access is an urgent task. This model then is used as a part of a complex system of information security. To solve this problem the article presented uses methods of information protection, graph theory and probability theory. The results shown in the article were calculated using Maple system of computer algebra. Scientific novelty of the work is: – in creating a mathematical model for calculation the probability of detecting of unauthorized physical access to information by an alarm system;
– in bulding of a simulation model for evaluation of level of protection of informatization object from unauthorized physical access;
– in developing of a technique of evaluation of full protection from unauthorized physical access for object of informatization

Abstract: Modern computer technology makes it a variety of tasks relevant to the field of information security. For example, for the protection of copyright in the images methods of steganography are used. To solve the problem of proving authorship (or vice versa) code obfuscation techniques are used. Obfuscation (from Lat. Obfuscare - obscure, obfuscate, and English. Obfuscate - make non-obvious, confusing, confusing) or obfuscated code - is the process of bringing the source code or executable program code to the form, that keeps its functionality, but complicates the analysis, understanding algorithms and modification during decompilation. Currently, there are special programs called obfuscators that performes obfuscation to solve the task in different ways. The article discusses the techniques of obfuscation from the most basic to sophisticated polymorphic generators obfuscators performing the mathematical transformation of the code, as well as the relationship of obfuscation and efficiency of program code execution and reduce the size of the program. The authors describe further development of obfuscation techniques.