CN106650327A - so file dynamic recovery-based Android application reinforcement method - Google Patents
so file dynamic recovery-based Android application reinforcement method Download PDFInfo
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- CN106650327A CN106650327A CN201611049813.5A CN201611049813A CN106650327A CN 106650327 A CN106650327 A CN 106650327A CN 201611049813 A CN201611049813 A CN 201611049813A CN 106650327 A CN106650327 A CN 106650327A
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- 238000000034 method Methods 0.000 title claims abstract description 69
- 230000002787 reinforcement Effects 0.000 title claims abstract description 22
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000004224 protection Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 238000009517 secondary packaging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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
- G06F21/121—Restricting unauthorised execution of programs
- G06F21/125—Restricting unauthorised execution of programs by manipulating the program code, e.g. source code, compiled code, interpreted code, machine code
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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
- G06F21/14—Protecting executable software against software analysis or reverse engineering, e.g. by obfuscation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/602—Providing cryptographic facilities or services
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Abstract
The invention discloses an Android application reinforcement method. A key code in a so file is reinforced through an encryption method based on dynamic recovery of the so file of a dynamic link library of an Android system application. The method comprises an encryption process and a decryption process. In the encryption process, the Android system application needed to be protected is encrypted, a section where the key code is located is encrypted and a new Android application is generated again, wherein files include an original dex file, a sol file of the decrypted key code and a so file of the encrypted key code. In the decryption process, when the Android application starts to be executed, the so file of the encrypted key code is dynamically recovered to obtain the key code, and a method of the key code is called. A key function is subjected to double-layer encryption, so that the difficulty of reverse analysis is increased, the code integrity is protected, and static analysis is effectively resisted; and only the key code is encrypted, so that application running efficiency is ensured.
Description
Technical field
The present invention relates to field of information security technology, more particularly to it is a kind of for Dynamic- Recovery android system application journey
The Android application reinforcement means of sequence dynamic link library so files.
Background technology
2007, Google companies were proposed operation system of smart phone Android (Android) operating system of increasing income, due to
Its abundant function and powerful customization capability, in recent years it just leap to as the operation system of smart phone market share
It is the first.At the same time, it is skyrocketed through based on the number of applications of Android platform.In July, 2013, Google companies announce
Become global maximum application business more than 1,000,000, Google Play shops in the application program of Google Play shop restockings
Shop.
With the rise of android system, many potential safety problems gradually come out, and information leakage, malice are detained
Take, event that system is destroyed it is of common occurrence.The research of Android securities also begins to be paid close attention to by people.Because
The language that Android platform application software is used is Java, and the program that traditional Java language is write is easy to inversely be broken
Solution, it cracks difficulty much smaller than the program that other are write using compiling language to cause Android application programs.It follows that
The subject matter that android system is faced in terms of using reinforcing is using secondary packing and malicious code insertion.Using two
Secondary packaging technique causes a large amount of popularizations of pirate application, compromises the interests and enthusiasm of developer significantly, and the plant of malicious code
Enter so that Android user faces the leakage of private data and the risk of property loss.The Dark Industry Link of Android applications is just
It is therefore to produce, the experience for reducing user by secondary packing product placement obtains profit, or insertion malicious code binding
Private data on equipment practices extortion.
At present, Android applications reinforcing most cases are also persistent in static treatment dex file, that is, dex files are entered
Go some trickle amendments to lift the difficulty of attack.This class reinforcement means increased can code reading difficulty, but substantially
How many protection effects do not played.This is because Android platform is born, the time is shorter, and the research in terms of software protection is still located
In the starting stage, it is difficult to protect the software copyright and interests and the personal secrets of users of application developer.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of for Dynamic- Recovery android system application
The Android application reinforcement means of program dynamic link library so files, the method is added based on android system using binary stream
Decryption method is reinforced, and the key code in so files is encrypted, to reach the purpose of protection Android application programs.
The present invention provide technical scheme be：
A kind of Android application reinforcement means based on Dynamic- Recovery so files, should for Dynamic- Recovery android system
With program dynamic link library so files, the key method (key code) in so files is carried out by binary stream encryption method
Reinforce so that Android application codes are protected；The reinforcement means includes ciphering process and decrypting process, specifically
Comprise the steps：
A. so files for needing Android application programs to be protected are directed to, concrete setting needs the pass of the specific section encrypted
Key method, is encrypted to the section (section) that key code is located, and performs following operation：
A1. first so files in Android application programs are obtained to needing Android application programs decompression to be protected,
So files are parsed；
A2. elf file headers are read, section area's head table is navigated to according to e_shoff；
A3. the e_shnum in elf file headers obtains saving area's quantity；
A4. all items in section area's head table are read according to e_shoff and e_shnum；
A5. index of the section table string table in section table is obtained by the e_shstrndx items in elf file headers, is then looked for
To the skew of section table string table；
A6. the character string read in section table string table saves each name for saving；
A7. compare the name of each section and the name of self-defined section, shdr- is passed through if matching>Sh_offest and
shdr->Sh_zie obtains the content of target section, and is saved in content；
A8. key key1 is set, first time encryption is carried out to content described in step A7 using key key1, obtain the
Intermediate data after once encrypting；
A9. key key2 is set, second encryption is carried out to intermediate data described in step A8 using key key2；
A10. data will be obtained after secondary encryption to update in so files, obtain new so files；
A11. compression regenerates apk, that is, complete ciphering process；It is literary comprising original dex in the apk for regenerating
Part and the data so file for obtaining after encrypting comprising the key that needs in decrypting process and second；
When B. starting to perform Android application programs, so files to encrypting carry out Dynamic- Recovery and obtain key code, hold
The following operation of row：
B1.Android application programs are written into after internal memory, perform the program in .init_array sections in so files；
B2. address of so files in process is found in internal memory；
B3. the address of section to be decrypted is searched in so files；
B4. the size of the page that section to be decrypted takes is obtained, modification takes the access limit of page；
When B5. performing key code, key key2 is obtained from so files, section to be decrypted is decrypted, obtain centre
Code；
B6. the intermediate code for obtaining for step B5, obtains key key1 from so files, carries out second decryption, obtains
To final key code；
B7. the method call of key code is carried out.
So file reinforcement means of the application program of above-mentioned android system, further, the key generation of the setting section
The method of code, specifically includes one or more in important algorithm method, checking login method, system core flow and method.
So file reinforcement means of the application program of above-mentioned android system, further, adds for the first time described in step A8
Second encryption described in close or step A9 can adopt AES encryption method, the AES encryption method to include using logical using AES
Code with encryption standard or the Encryption Tool using AES, can adopt from the AES or existing AES encryption instruments write.
So file reinforcement means of the application program of above-mentioned android system, further, performs so literary described in step B1
Program in part, specifically by JNI call-by mechanisms the method in so files is called.
Compared with prior art, the invention has the beneficial effects as follows：
Existing Android applications reinforcing most cases are also persistent in static treatment dex file, that is, dex files are entered
Go some trickle amendments to lift the difficulty of attack.This class reinforcement means be only to increase can code reading difficulty, it is but real
Do not have its how many protection effects in matter.The technical scheme provided using the present invention, can dynamically decrypt so files, will
The direction of Android protections has been transferred to so files by dex files.The reinforcement means that the present invention is provided carries out double to Key Functions
Layer encipherment protection, and the difficulty of attacker's conversed analysis is increased, attacker cannot take the core code of program, the journey of modification
Sequence can not normally be run, it is possible to achieve the integrality of code is protected, static analysis has been reasonably resistant to, and prevent so literary
The code of part is tampered and kidnaps, and causes hacker from checking Android source codes by instruments such as decompilings, and only to closing
Key code is encrypted protection, it is ensured that the operational efficiency of program.
Description of the drawings
Fig. 1 is the FB(flow block) of the method provided by the present invention.
Fig. 2 is the file composition structure chart of so files in Android application programs.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment, but limits the model of the present invention never in any form
Enclose.
The present invention provides a kind of reinforcing side for Dynamic- Recovery android system application program dynamic link library so files
Method, it is literary to so by binary stream encryption method for Dynamic- Recovery android system application program dynamic link library so files
Key code in part is reinforced so that Android application codes are protected；The reinforcement means bag that the present invention is provided
Ciphering process and decrypting process are included, Fig. 1 is the FB(flow block) of the method provided by the present invention, is comprised the steps：
A. key code place section is encrypted, performs following operation：
A1. so files are parsed；
A2. section that ad hoc approach is located is navigated to；
A3. first time encryption is carried out using key key1；
A4. second encryption is carried out using key key2；
A5. so files are updated；
A6. calculate the hash value of so files and hash value is encrypted, in being stored in dex files；
B. the code to encrypting is decrypted, and performs following operation：
B1. initial address of so files in internal memory is found；
B2. hash value computing is carried out to so files, the result for obtaining is encrypted, and the value preserved in dex files is entered
Row compares；
B3. first time decryption is carried out using key key1；
B4. second decryption is carried out using key key2；
B5 carries out the method call of key code.
The reinforcement means based on android system binary stream encryption technology that the present invention is provided is conciliate including ciphering process
Close process；Being embodied as the inventive method is illustrated by the following examples：
Ciphering process：
For Android application programs (apk) to be protected are needed, decompression first obtains so files in apk, then to so
File is parsed；
Developer's setting needs the JNI key methods of encryption (to need the JNI key methods of encryption according to the demand of developer
Judgement setting is carried out, for example, some important algorithm methods, or checking login method, or some system core flow process),
Then the self-defined section that the key method of the JNI for needing encryption is located is navigated to；
By reinforcing person setting key key1, (reinforcing person's need for confidentiality is needed with this key to ciphertext when decryption
It is decrypted), the first instruction using key key1 to key method carries out first time encryption and (adopts AES encryption, can adopt voluntarily
The AES encryption program write, it is also possible to using the Encryption Tool of AES), obtain the intermediate data after encryption for the first time；
Then key key2 is set, second encryption (being also adopted by AES encryption) is carried out to intermediate data using key key2；
Double AES encryption, can increase security；
Update so files：Data will be obtained after secondary encryption to update in so files, obtain new so files；
The hash value of new so files is calculated, the value is used to verify the integrality of so；It is encrypted that (MD5 adds to hash value
It is close) after be deposited in dex files；The checking parameter to so files is added in dex files；
Compression regenerates apk, that is, complete ciphering process.
In the apk for regenerating, dex files, Partial key code encryption comprising the verification hash for adding so files
So files (being one section of program c program that reinforcing person provides, acquiescence is safe), also comprising decrypting process and right in so files
The checking procedure of itself.
Decrypting process：
Start configuration processor (the apk programs of AES encryption), the static section in so files is first carried out：
Specifically, AES encryption program is written into after internal memory, and when program starts and performs JNI (Java are first passed through
Native Interface) call-by mechanism, perform verification and decryption in so files and recover code, particular by Java
Method in code call so file (so storehouses), first search utility internal memory, find needs the corresponding of reduction after encryption
Class and method.During searching can prefabricated some labels help to find the part for needing decryption in a program；
Then, section that encrypted code is located is found in internal memory：The composition structure of so files is as shown in Fig. 2 so files are ELF
File mainly includes it being respectively ELF header (ELF header), program header table (Program header table), section
(Section, including .text and .rodata) and section header table (Section header table).In fact, in a file
Not necessarily include full content, and position also may not be identical with declaration order, the position of only ELF header be it is fixed, remaining
The information such as position, the size of each several part by ELF header in each entry value determining.Finding method is specifically：
Pointer is jumped back to into the original position of so files, the file header of so files is read, section area is navigated to according to e_shoff
Head table, obtains saving quantity size in area according to elf_shnum.From section area, head table reads size Ge Jie areas item.It is literary by elf
E_shstrndx items in part head obtain index of the section table string table in section table, then find the skew of section table string table
string_off.Each section regional address is corresponding with its character string, search and Custom Encryption section character string identical section,
Pass through shdr- if matching>Sh_offest and shdr->Sh_zie positioning obtains the content of the section.Elf file headers have recorded
Skew of so files other parts in so files, such that it is able to navigate to the region at so files other parts place, for entering
One step is parsed.
ELF top of files (Elf file headers) mainly include verification and and other structures offset address and length information,
Specifically it is shown in Table 1：
The information and corresponding meaning of the Elf file headers of table 1 record
For so files, the hash value of so files is calculated, then Hash is encrypted ((md5 encryption)), and dex files
The value of middle preservation is compared, if unanimously, read-me is not changed, and otherwise returns error code, program stopped operation.
When key code is performed, key key2 is obtained from so files, key code is decrypted, obtain middle generation
Code.For the intermediate code for obtaining, key key1 is obtained from so files, carry out second decryption and obtain final key generation
Code；Twice decrypting process corresponds to respectively ciphering process twice, to guarantee the safety of application program.
Finally, the method for realizing correctly safely calling key code.
It should be noted that the purpose for publicizing and implementing example is help further understands the present invention, but the skill of this area
Art personnel be appreciated that：In without departing from the present invention and spirit and scope of the appended claims, various substitutions and modifications are all
It is possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
The scope that book is defined is defined.
Claims (6)
1. a kind of Android applications reinforcement means, literary based on Dynamic- Recovery android system application program dynamic link library so
Part, is reinforced by binary stream encryption method to the key code in so files so that Android application codes are obtained
To protection；The reinforcement means includes ciphering process and decrypting process, specifically includes following steps：
A. ciphering process：To needing Android application programs to be protected to be encrypted, concrete setting needs the specific section of encryption
Key code, to the section that key code is located new Android application programs are encrypted and regenerate；It is described to regenerate
New Android application programs in crucial generation after so files comprising key code after original dex files, decryption and encryption
So files of code；The encryption comprises the steps：
A1. to needing Android application programs decompression to be protected, so files in Android application programs are obtained, to so
File is parsed；
A2. elf file headers are read, section area's head table is navigated to；
A3. according to elf file headers, reading obtains saving area's quantity；
A4. read and obtain saving all items in area's head table；
A5. read and obtain index of the section table string table in section table, then the skew for finding section table string table；
A6. the character string in section table string table is read, each name for saving is saved；
A7. the name of each section and the name of self-defined section are compared, if it does, then obtaining the content of target section and preserving；
A8. key key1 is set, first time encryption is carried out to the content of target section described in step A7 using key key1, obtain the
Intermediate data after once encrypting；
A9. key key2 is set, second encryption is carried out to intermediate data described in step A8 using key key2；
A10. data will be obtained after secondary encryption to update in so files, obtain new so files；
A11. compression regenerates apk, that is, complete ciphering process；In the apk for regenerating comprising original dex files with
And so files comprising key code after decryption and encryption；
B. decrypting process：When starting to perform Android application programs, Mobile state is entered to so files of key code after encryption extensive
It is multiple, key code is obtained, the method for recalling the key code；The Dynamic- Recovery specifically performs following operation：
B1. after Android application programs are written into internal memory, the program in so files in Android application programs is performed；
B2. address of so files in process is found in internal memory；
B3. the address of section to be decrypted is searched in so files；
B4. the size of the page that section to be decrypted takes is obtained, modification takes the access limit of page；
When B5. performing key code, key key2 is obtained from so files, section to be decrypted is decrypted, obtain middle generation
Code；
B6. the intermediate code for obtaining for step B5, obtains key key1 from so files, carries out second decryption, obtains most
Whole key code；
B7. the method call of key code is carried out.
2. Android applications reinforcement means as claimed in claim 1, is characterized in that, the setting needs the specific section of encryption
Key code, sets especially by one or more in important algorithm method, checking login method, system core flow and method
Surely obtain.
3. Android applications reinforcement means as claimed in claim 1, is characterized in that, the A2 is navigated to specific reference to e_shoff
Section area's head table；The A3 obtains saving area's quantity with specific reference to the e_shnum in elf file headers；The A4 is with specific reference to e_
Shoff and e_shnum reads and obtains saving all items in area's head table；The A5 is especially by the e_ in elf file headers
Shstrndx items obtain index of the section table string table in section table.
4. Android applications reinforcement means as claimed in claim 1, is characterized in that, step A7 is especially by shdr->sh_
Offest and shdr->Sh_zie obtains the content of the target section.
5. Android applications reinforcement means as claimed in claim 1, is characterized in that, encrypt for the first time or step described in step A8
Second encryption described in A9 adopts AES encryption method.
6. Android applications reinforcement means as claimed in claim 1, is characterized in that, step B1 is adjusted especially by JNI call-by mechanisms
The method program in .init_array sections in for performing Android application program so files.
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| CN107169324A (en) * | 2017-05-12 | 2017-09-15 | 北京理工大学 | A kind of Android application reinforcement means based on dynamic encryption and decryption |
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| CN109766141A (en) * | 2018-12-26 | 2019-05-17 | 北京思源互联科技有限公司 | A kind of data dynamic updating method and its device based on dynamic link library |
| CN110502874A (en) * | 2019-07-19 | 2019-11-26 | 西安理工大学 | A kind of Android App reinforcement means based on file self-modifying |
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