The invention discloses a code obfuscation method and device based on chaotic opaque predicates. By adopting the scheme, the capability of resisting static analysis is strong through a chaotic opaque expression of a complicated structure mapped chaotically, the efficiency is higher, and a chaotic opaque expression of any value can be constructed, so that the method and the device is more convenient and safer during code obfuscation. The technology of constructing chaotic opaque predicates through the chaotic opaque expression and a number theory expression has the convenience of constructing opaque predicates of the number theory expression and also has the safety of resisting static attack of the chaotic opaque expression, so that the whole construction of the opaque predicates is more convenient and safer. In addition, according to the scheme, an algorithm framework of the opaque expression is constructed through chaotic mapping and secondary mapping combination, and different opaque expression construction modes can be produced by utilizing different chaotic mapping and secondary mapping combinations, so that the code obfuscation process has diversity and uncertainty, and the universality and safety are higher.

Code obfuscation method and device based on chaotic opaque predicates

The invention discloses a method for protecting a Python program. The method includes a parallel step and a non-parallel step after the parallel step, wherein the parallel step includes a parallel substep A: based on the arbitrarily-preset relationship corresponding to operation codes, exchanging a first preset operation code in opcode.h, and then exchanging a second preset operation code; a parallel substep B: modifying operation codes in opcode.py, and keeping accordant with the preset relationship corresponding to the operation codes; the non-parallel step includes a step 1: recompiling source codes to get a new Python interpreter. The method solves the technical problem that existing decompiling tools cannot decompile to obtain source codes and protect the Python program.

Method for protecting Python program

The invention provides a structure flattening method for mobile codes, which comprises the following steps of: segmenting instructions contained in all first basic blocks in a function to form a plurality of second basic blocks; And reordering the plurality of second basic blocks through the condition instruction and the jump instruction. The invention provides a structure flattening method for mobile codes, which comprises the following steps of: performing cutting by taking a function as an operation object and taking an instruction as granularity, and combining into a new basic block; And disorganizing the up-down sequence of the new basic blocks and replacing the skip through the condition instruction and the skip instruction. Therefore, the intermediate code LLVM IR of the compiler can be subjected to structure flat change; The original control flow is platformized and randomized, the reverse complexity of the expansion code can be increased, the IDA Pro is resisted, the code sequence of the context after the control flow is flattened and randomized is not the final execution sequence, and the human reading difficulty is increased.

A structure flattening method and system for mobile code

The invention discloses a system for protecting intellectual properties through encrypting Python plaintext source code tokens. The system comprises an encryption system and an operation system, wherein the encryption system comprises a Python plaintext source code token encryption module which is used for encrypting Python plaintext source code files through a self-defined symmetric private key encryption algorithm; the operation system comprises a new Python interpreter which is used for decrypting the Python cyphertext source code files; a Python cyphertext code token decryption operation module is added in the new Python interpreter; and the new Python interpreter is obtained from a Python protogenic interpreter through the Python cyphertext code token decryption operation module. Thesystem is capable of effectively preventing Python files from being changed, read and analyzed, so as to achieve the aim of protecting intellectual properties.

System for protecting intellectual properties through encrypting Python plaintext source code tokens

The invention discloses a method and system for protecting JavaScript source codes in a ciphertext case sealing mode. The method comprises the following steps of isolating codes bound with all eventsin the JavaScript source codes and obtaining the isolated codes; compressing the isolated codes through adoption of a preset code compression mixing method; randomly generating a key through adoptionof a preset key encryption method and encrypting the compressed codes through utilization of the key, thereby obtaining a first ciphertext; generating a second ciphertext through combination of related codes of a text decryption function and key combination; and combining the first ciphertext and the second ciphertext, wrapping the combined ciphertext through utilization of a layer of scope and generating a final encrypted file; and outputting the final encrypted file. According to the method and the system, the JavaScript source codes are encrypted well, the source codes are effectively prevented from being broken and damaged by a lawbreaker, and the method and the system can be widely applied to the technical field of source code protection.

Method and system for protecting JavaScript source codes in ciphertext case sealing mode

The invention discloses a Python code obfuscation method based on control flow and appearance obfuscation. The method includes: dividing Python codes in each function into corresponding basic blocks by taking the function as a unit; numbering the basic blocks in each function; using a secret key generation algorithm based on sectional Logistic chaotic mapping to generate two sects of secret keys corresponding to the numbers; disorganizing a sequence of the basic blocks in each function, using a control sentence for control, packaging and controlling control variable of an execution sequence of the basic blocks, and using the two sets of the secret keys as condition variables for generating numbers of the basic blocks needing to be executed and in if sentence; performing appearance obfuscation on the codes after control flow obfuscation is performed, and replacing the codes with meaningless character strings. By the method, intellectual property of software developed by using Python language can be protected.

Python code obfuscation method based on control flow and appearance obfuscation

The invention discloses a Python byte code file protection method based on a module hook. The method comprises the following steps: 1, performing encryption processing on a Python byte code file; 2, designing a Python module hook and a corresponding registration script; 3, adding the Python module hook and the corresponding registration script to a source code file of a Python interpreter of a client; 4, releasing a main program and the encrypted Python byte code file to the client by a developer terminal, and providing a new source code file of the Python interpreter; 5, compiling the source code file of the Python interpreter with the Python module hook and the corresponding registration script added to obtain a compiled Python interpreter; and 6, executing the main program by the client by using the compiled Python interpreter. By adoption of the Python byte code file protection method disclosed by the invention, decompilation is effectively defended, and the protection strength of Python software programs is improved.

Python byte code file protection method based on module hook

The invention discloses an operation code replacement and combination-based Python script program anti-reversal method, which comprises the following steps: 1, analyzing generation and actuating logic of an operation code in a Python interpreter and a virtual machine; 2, changing an operation code mapping (opcode.h) unit; 3, analyzing basic block information in an operation code sequence in a bytecode file generated by compiling; 4, defining a new operation code; 5, changing a peephole optimization (peephole.h) unit, and carrying out combination on two (or more) operation codes located in the same basic block to form a new operation code; 6, changing a virtual machine (ceval.h) unit, so as to support the interpretive execution on the new operation code; 7, determining an operation code value by the Python virtual machine, knowing that the operation code has already been subjected to replacement and combination, and adopting a corresponding interpretation process to carry out the interpretive execution on the operation code; 8, normally executing a Python script program.

Operation code replacement and combination-based Python script program anti-reversal method

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Python code obfuscation method based on control flow and appearance obfuscation

Python byte code file protection method based on module hook

Operation code replacement and combination-based Python script program anti-reversal method