CN105426708A - Reinforcing method of application program of Android system - Google Patents
Reinforcing method of application program of Android system Download PDFInfo
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- CN105426708A CN105426708A CN201610034627.8A CN201610034627A CN105426708A CN 105426708 A CN105426708 A CN 105426708A CN 201610034627 A CN201610034627 A CN 201610034627A CN 105426708 A CN105426708 A CN 105426708A
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/12—Protecting executable software
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Abstract
The invention discloses a reinforcing method of an application program of an Android system. The method comprises: reinforcing a key code in the Android application program by binary system flow encryption and protecting a code of the application program; comprising: analyzing a classes.dex file; positioning to a key method; performing primary encryption to obtain intermediate data; performing secondary encryption on the intermediate data; calculating a new Hash value of the dex file, and storing into a so file after the encryption; calculating to obtain new checksum and signature values of the dex file, and updating the dex file; regenerating an apk, thus finishing the encryption process. During decryption, the Hash value of the dex file is calculated, and the Hash value obtained by encryption is compared with the value in the so file; secondary decryption is performed to obtain the key code. Due to the reinforcing method, an Android source code cannot be checked by a decompilation tool, only the key code is protected by encryption, completeness of the code is protected, a static analysis is effectively resisted, the code of the Android program is prevented from being tampered, and operation efficiency of the program is ensured.
Description
Technical field
The present invention relates to field of information security technology, particularly relate to a kind of reinforcement means of application program of android system.
Background technology
Android (Android) operating system, by the open source operating system of Google company and OHA member's joint development, is mainly used in mobile device, as smart mobile phone, panel computer etc.Since releasing from 2007, Android operation system obtains rapidly the support of numerous developers and many manufacturers based on the feature such as linux kernel, open source code with it.Meanwhile, the number of applications based on Android platform rapidly increases.In July, 2013, Google company announces that the number of applications in GooglePlay shop is more than 1,000,000, becomes the application shop that the whole world is maximum.
At present, most Android program all only uses AndroidSDK to write, but the program that traditional Java language is write is easy to suffer reverse cracking.Android system is pirate application and Malware in the subject matter that secure context faces.Interests and the enthusiasm greatly compromising numerous developers prevailing of pirate application, and the implantation of malicious code makes Android user face the risk of privacy compromise and property loss.In Android industrial chain, pirate tissue abnormalities enlivens.They tightly follow Android application, and which applies fire, just " mountain vallage " what application." packing party " the lighter implants malice ad plug-in in mountain vallage application, is ejected make profit by advertisement; Android wooden horse, back door are implanted wherein by severe one, carry out Long-distance Control to customer mobile terminal.
The Software Protection Technique of windows platform, owing to use widely and Security Officer studies for many years, has defined the protect system of complete set.But due to the difference of Android platform and windows platform bottom layer realization, cause effectively to be transplanted to Android platform in a series of theory for software protection of windows platform and mechanism.Simultaneously; because the Android platform birth time is shorter; the research of software protection aspect is still in the starting stage, and can not provide for more and more ripe breaking techniques and more effectively protect, the event that the intellecture property of software developer is invaded is of common occurrence.
More existing Android application program reinforcement means, adopt the method for static treatment mostly, namely carry out to dex file the difficulty that some amendments increase attack.This reinforcement means only increases code reading difficulty, but its protection effect is limited, and assailant still can obtain the code of program, cannot ensure the security of application program.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art; the invention provides a kind of reinforcement means of application program of android system; the method utilizes binary stream encryption method to reinforce based on android system; key code in Android application program is encrypted, to reach the object of protection Android application program.
Technical scheme provided by the invention is:
A reinforcement means for the application program of android system, is reinforced the key code in Android application program by binary stream encryption method, and Android application code is protected; Described reinforcement means comprises ciphering process and decrypting process, specifically comprises the steps:
A. for the Android application program needing protection, key code is encrypted, performs and operate as follows:
A1. first to the Android application program decompress(ion) needing protection, obtain the classes.dex file in Android application program, described dex file is resolved;
A2. setting needs the key method of the certain kinds of encryption, navigates to the key method of the certain kinds needing encryption;
A3. set key key1, use key key1 to carry out first time encryption to the instruction of key method described in steps A 2, obtain the intermediate data after first time encryption;
A4. set key key2, use key key2 to carry out second time encryption to intermediate data described in steps A 3;
A5. by obtaining Data Update after superencipher in dex file, new dex file is obtained;
The hash value of A6. new described in calculation procedure A5 dex file, this value is for verifying the integrality of dex; Be deposited in so file after hash value is encrypted;
A7. for dex file new described in steps A 5, recalculate the value obtaining checksum and signature, upgrade dex file;
A8. compression regenerates apk, namely completes ciphering process; Comprise the dex file of key code encryption in the described apk regenerated and comprise so file of deciphering and dex check information;
When B. starting to perform Android application program, the Android application program of encryption is decrypted and obtains key code, perform and operate as follows:
After B1.Android application program is written into internal memory, perform the program in so file;
B2. in internal memory, dex file is found;
B3. for the dex file obtained, calculate the hash value of dex file, then Hash is encrypted, obtain the hash value after encrypting;
B4. the value of preserving in so file described in the hash value after encryption described in step B3 and steps A 6 is compared; If consistent, then perform step B5, otherwise return error code, program stopped runs;
When B5. performing key code, from so file, obtain key key2, key code is decrypted, obtain intermediate code;
B6. for the intermediate code that step B5 obtains, from so file, obtain key key1, carry out second time deciphering, obtain final key code;
B7. the method call of key code is carried out.
The reinforcement means of the application program of above-mentioned android system, further, setting described in steps A 2 needs the key method of certain kinds of encryption, and what specifically comprise in important algorithm method, checking login method, system core flow and method is one or more.
The reinforcement means of the application program of above-mentioned android system, further, first time described in steps A 3 encrypts or described in steps A 4, second time encryption all can adopt AES encryption method, and described AES encryption method comprises the AES encryption program that employing is write voluntarily or the Encryption Tool using AES.
The reinforcement means of the application program of above-mentioned android system, further, is encrypted as md5 encryption method described in steps A 6.
The reinforcement means of the application program of above-mentioned android system, further, performs the program in so file, calls the method in so file specifically by JNI call-by mechanism described in step B1.
Compared with prior art, the invention has the beneficial effects as follows:
Existing Android application program reinforcement means, adopts the method for static treatment mostly, namely carries out to dex file the difficulty that some amendments increase attack.This reinforcement means only increases code reading difficulty, but its protection effect is limited, and assailant still can obtain the code of program.Utilize technical scheme provided by the invention, can dynamically decrypted program.Reinforcement means provided by the invention carries out double layer encryption protection to Key Functions; and add the safety check of dex; assailant is allowed not get code; and the program of amendment also cannot be run, and can realize protecting the integrality of code, effectively resist static analysis; the code of Android application program is prevented to be tampered; and make hacker not check Android source code by instruments such as decompilings, and only protection is encrypted to key code, ensure that the operational efficiency of program.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) that the invention provides method.
Fig. 2 is the file composition structural drawing of the dex file in Android application program.
Embodiment
Below in conjunction with accompanying drawing, further describe the present invention by embodiment, but the scope do not limited the present invention in any way.
The invention provides a kind of reinforcement means based on android system binary stream encryption technology, Fig. 1 is the FB(flow block) that the invention provides method, comprises the steps:
A. key code is encrypted, performs and operate as follows:
A1. classes.dex file is resolved;
A2. specific class and method is navigated to;
A3. key key1 is used to carry out first time encryption;
A4. key key2 is used to carry out second time encryption;
A5. dex file is upgraded;
A6. calculate the hash value of classes.dex file and hash value is encrypted, being stored in so file;
B. the code of encryption is decrypted, performs and operate as follows:
B1. the start address of dex is found;
B2. hash value computing is carried out to dex file, the result obtained is encrypted, and the value of preserving in so file compares;
B3. key key1 is used to carry out first time deciphering;
B4. key key2 is used to carry out second time deciphering;
B5 carries out the method call of key code.
Reinforcement means based on android system binary stream encryption technology provided by the invention comprises ciphering process and decrypting process; The concrete enforcement of the inventive method is described by the following examples:
Ciphering process:
For the Android application program (apk) needing protection, first decompress(ion) obtains the classes.dex file in apk, then resolves dex file;
Developer sets needs the key method of the certain kinds of encryption (to need the certain kinds key method of encryption to carry out judgement setting according to the demand of developer, such as, some important algorithm method, or checking login method, or some system core flow processs), then navigate to the key method of the certain kinds needing encryption;
Key key1 (reinforcing person's need to be keep secret is set by reinforcing person, need to be decrypted by this double secret key ciphertext when deciphering), first use key key1 to carry out first time encryption to the instruction of key method and (adopt AES encryption, the AES encryption program of writing voluntarily can be adopted, also the Encryption Tool of AES can be used), obtain the intermediate data after first time encryption;
Then set key key2, use key key2 to carry out second time encryption (also adopting AES encryption) to intermediate data; Double AES encryption, can increase security;
Upgrade dex file: by obtaining Data Update after superencipher in dex file, obtain new dex file;
Calculate the hash value of new dex file, this value is for verifying the integrality of dex; Be deposited into after (md5 encryption) is encrypted to hash value in so file; Namely in so file, add the School Affairs deciphering parameter to dex file;
For amended dex file, recalculate the value obtaining checksum and signature, upgrade dex file;
Compression regenerates apk, namely completes ciphering process.
In the apk regenerated, comprise the dex file of Partial key code encryption, so file (be one section of program c program that reinforcing person provides, acquiescence is safe), in so file, comprise the checking procedure of decrypting process and dex.
Decrypting process:
Start executive routine (the apk program of AES encryption), first perform the program in so file:
Particularly, after AES encryption program is written into internal memory, when program starts to perform first by JNI (JavaNativeInterface) call-by mechanism, perform the School Affairs deciphering in so file and recovery code, particular by the method in Java code call so file (so storehouse), first search utility internal memory, finds after encryption, need reduction corresponding class and method.During searching can more prefabricated labels in a program, help find need deciphering part;
Then, dex file is found: Fig. 2 is the composition structural drawing of dex file in internal memory, dex file mainly comprise dex file header, character string identification symbol list, type identification item, function prototype label table, zone identifier list, function identification table, class label table, data field (data that namely each tabular goes out above are kept at data field), static linkage data segment (can be sky), finding method specifically:
Dex file is found from odex file, the initial magic field of dex file is for representing dex version, its value is fixed as " 6465780a30333500 " at present, be converted to character string " dex.035 ", therefore forward lookup page can be passed through, until find the magic field of dex file, be the start address of dex file herein; After finding dex file, according to the dex file structure in Fig. 2, dex file header (dexheader) can be resolved.Dex file header have recorded the skew of other parts of dex file in dex file, thus can navigate to the region at other part places of dex, for further parsing.
Dex top of file (Dex file header) mainly comprises offset address and the length information of School Affairs and other structures, specifically in table 1:
The information of table 1Dex file header record and corresponding meaning
For the dex file obtained, calculate the hash value of dex file, then Hash is encrypted ((md5 encryption)), compare with the value of preserving in so file, if unanimously, then read-me is not modified, otherwise return error code, program stopped runs.
When performing key code, from so file, obtaining key key2, key code is decrypted, obtaining intermediate code.For the intermediate code obtained, from so file, obtain key key1, carry out second time deciphering and obtain final key code; Twice decrypting process corresponding twice ciphering process respectively, to guarantee the safety of application program.
Finally, the method correctly calling key code is safely realized.
It should be noted that the object publicizing and implementing example is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: in the spirit and scope not departing from the present invention and claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (5)
1. a reinforcement means for the application program of android system, is reinforced the key code in Android application program by binary stream encryption method, and Android application code is protected; Described reinforcement means comprises ciphering process and decrypting process, specifically comprises the steps:
A. for the Android application program needing protection, key code is encrypted, performs and operate as follows:
A1. first to the Android application program decompress(ion) needing protection, obtain the classes.dex file in Android application program, described dex file is resolved;
A2. setting needs the key method of the certain kinds of encryption, navigates to the key method of the certain kinds needing encryption;
A3. set key key1, use key key1 to carry out first time encryption to the instruction of key method described in steps A 2, obtain the intermediate data after first time encryption;
A4. set key key2, use key key2 to carry out second time encryption to intermediate data described in steps A 3;
A5. by obtaining Data Update after superencipher in dex file, new dex file is obtained;
The hash value of A6. new described in calculation procedure A5 dex file, this value is for verifying the integrality of dex; Be deposited in so file after hash value is encrypted;
A7. for dex file new described in steps A 5, recalculate the value obtaining checksum and signature, upgrade dex file;
A8. compression regenerates apk, namely completes ciphering process; Comprise the dex file of key code encryption in the described apk regenerated and comprise so file of deciphering and dex check information;
When B. starting to perform Android application program, the Android application program of encryption is decrypted and obtains key code, perform and operate as follows:
After B1.Android application program is written into internal memory, perform the program in so file;
B2. in internal memory, dex file is found;
B3. for the dex file obtained, calculate the hash value of dex file, then Hash is encrypted, obtain the hash value after encrypting;
B4. the value of preserving in so file described in the hash value after encryption described in step B3 and steps A 6 is compared; If consistent, then perform step B5, otherwise return error code, program stopped runs;
When B5. performing key code, from so file, obtain key key2, key code is decrypted, obtain intermediate code;
B6. for the intermediate code that step B5 obtains, from so file, obtain key key1, carry out second time deciphering, obtain final key code;
B7. the method call of key code is carried out.
2. the reinforcement means of the application program of android system as claimed in claim 1, it is characterized in that, setting described in steps A 2 needs the key method of certain kinds of encryption, and what specifically comprise in important algorithm method, checking login method, system core flow and method is one or more.
3. the reinforcement means of the application program of android system as claimed in claim 1, it is characterized in that, first time described in steps A 3 encrypts or described in steps A 4, second time encryption all can adopt AES encryption method, and described AES encryption method comprises the AES encryption program that employing is write voluntarily or the Encryption Tool using AES.
4. the reinforcement means of the application program of android system as claimed in claim 1, is characterized in that, be encrypted as md5 encryption method described in steps A 6.
5. the reinforcement means of the application program of android system as claimed in claim 1, is characterized in that, perform the program in so file described in step B1, call the method in so file specifically by JNI call-by mechanism.
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