The embodiment of the invention provides a method and a device for mixing character strings in a source code. The method and the device are applied to a software development tool. The method specifically comprises the steps of compiling a to-be-mixed source code by use of a Clang tool to obtain a syntax tree; traversing the syntax tree to obtain a character string constant list and a character string reference list of the character string in the source code; reading a character string constant according to a position indicated in the character string constant list and encrypting the characterstring constant, and replacing an original character string constant with the encrypted character string; finding the encrypted character string according to the character string reference list, and inserting a decryption code at a position in the source code where the encrypted character string is located. Through replacement, all character string constants in the source code are converted into the encrypted character strings and are no longer plaintext information which may cause secret leakage, thereby avoiding the corresponding safety risk.

Method and device for mixing character string in source code

The embodiment of the invention provides an Android malicious application family classification method and device and electronic equipment, and the method comprises the steps: carrying out the preprocessing of an APK file of an Android malicious application, and obtaining a smali file corresponding to the APK file; Bbased on the smali file, counting different method blocks containing sensitive elements, and based on the semantic information of the Opcode, uniformly expressing the Opcode by using a formalized operation code to generate a sensitive operation code sequence; And based on the sensitive operation code sequence, generating a text feature vector, and based on the text feature vector, classifying the Android malicious applications. According to the embodiment of the invention, thebehavior of the malicious application can be more accurately depicted, so that the classification precision of the malicious application is more effectively improved.

Android malicious application family classification method and device and electronic equipment

The invention discloses a file protection method, device and computing equipment and a computer storage medium. The file protection method comprises the steps that a first abstract syntax tree corresponding to a to-be-protected instruction in an original program file is generated; hiding processing on at least a to-be-processed instruction in the first abstract syntax tree is conducted, and afterthe hiding process is completed, a second abstract syntax tree is obtained; repairing process on a header file corresponding to the second abstract syntax tree is conduced, and after the repairing processing is completed, a third abstract syntax tree is obtained; a program file corresponding to the third abstract syntax tree is generated. According to the file protection method, the abstract syntax tree corresponding to the to-be-protected instruction is generated through the file protection method, and the hiding processing is conducted on the to-be-protected instruction in the abstract syntax tree, so that difficulty of decompiling is increased, malicious acquisition of instructions in the program file by other people is effectively prevented, and security of the program file is guaranteed.

File protection method, device and computing equipment and computer storage medium

The invention provides a software protection method. The software protection method includes analyzing .NET executable programs and recognizing metadata directories in the .NET executable programs; hiding contents in the metadata directories in preset modes; modifying program entries of the .NET executable programs to allow the program entries to direct to predetermined codes so as to obtain protected .NET executable programs. The predetermined codes are used for recovering the metadata directories. The invention further provides a software protection device and a computer readable storage medium. Instructions are stored in the computer readable storage medium. The software protection method, the software protection device and the computer readable storage medium have the advantages that static analysis can be resisted, and the purpose of effectively protecting .NET programs can be achieved.

Software protection method and software protection device

The invention discloses a copyright protection method of a mobile APP. The method includes the following steps that 1, the mobile APP is decomposed into an unprotected area and a protected area from a framework; 2, the address of the protected area changes every time the APP is started; 3, the path of each file in the protected area is operated by the adoption of a hash confusion method. According to the copyright protection method of the mobile APP, the mobile APP is decomposed into the unprotected area and the protected area from the framework, the address of the protected area changes every time the APP is started, and the path of each file in the protected area is operated by the adoption of the hash confusion method so that the file can be encrypted, and at the same time, it can be ensured that the performance does not lose. The invention further provides a copyright protection system of the mobile APP.

Copyright protection method and system of mobile APP

The invention discloses a binary software protection method by means of a dynamic fine-grained code hiding and obfuscating technology. The method comprises the steps that S1, a hidden target is selected, wherein a to-be-hidden code block is selected in a target program with a basic block as a unit; S2, the selected basic block is hidden, wherein according to each to-be-hidden basic block, an original code segment is replaced with a distributor function call, and other obfuscating instructions are filled in the rest positions; S3, the codes are packaged again, a new code segment is created so as to save all additional logic and data. The method has the advantages of being wide in application range, light in magnitude, extendable, high in safety and the like.

Binary software protection method by means of dynamic fine-grained code hiding and obfuscating technology

The invention discloses a binary software protection method based on dynamic code conversion. The method comprises the following steps of: S1: extracting the basic block of a code to be protected to obtain pieces; S2: processing the pieces: equally dividing all pieces into two parts including an upper half part and a lower half part, randomly selecting certain pieces from the upper half part, and initializing the pieces into a ciphertext state, wherein the rest pieces of the corresponding lower half part of the upper half part are under the ciphertext state; and S3: inserting a decryption function: inserting the decryption function into the tails of all pieces for jumping, wherein the decryption function has the function that a next piece which is about to be executed is decrypted during operation. The method has the advantages of simple principle, easiness in realization, efficiency in execution, large protection strength and the like.

Binary software protection method based on dynamic code conversion

The invention discloses a method of malicious code family identification based on incremental DBSCAN algorithm The method saves malicious code feature vectors in a database The method comprises the steps of A1, when a malicious code sample is captured, IDA Python script is used to extract the features of the sample, the feature is transformed into feature vectors and saved in the database; A2, all the eigenvectors associated with the new feature vector are searched in the database, the eigenvectors being searched out are recorded as a set S; A3, the set S is analyzed and processed, different processing is made based on different categories; A4, all the clusters in the database are checked, and each cluster is a malicious code family which is identified The method of malicious code family identification based on incremental DBSCAN algorithm has the advantages of being good in universality, high in efficiency and good in accuracy

Method of malicious code family identification based on incremental DBSCAN algorithm

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Binary software protection method by means of dynamic fine-grained code hiding and obfuscating technology

Binary software protection method based on dynamic code conversion

Method of malicious code family identification based on incremental DBSCAN algorithm