CN106375080B - Flash file encryption and decryption method and device - Google Patents
Flash file encryption and decryption method and device Download PDFInfo
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- CN106375080B CN106375080B CN201610773925.9A CN201610773925A CN106375080B CN 106375080 B CN106375080 B CN 106375080B CN 201610773925 A CN201610773925 A CN 201610773925A CN 106375080 B CN106375080 B CN 106375080B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
- H04L9/0631—Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
Abstract
The invention relates to a method and a device for encrypting and decrypting a flash file. The method comprises the following steps: step 1, setting a core logic SWF file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by C language and encrypted by a custom algorithm, and a file with a custom extension is generated after encryption; the file support of the custom extension is called by ActionScript; and 2, setting a shell SWF file, wherein the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, and the file with the defined extension name in the step 1 is called through the decryption interface, decrypted to generate the SWF file and loaded. The invention can reduce the possibility of the SWF file being cracked, and can ensure that the SWF file transmitted in the network is encrypted and can not directly acquire the plaintext.
Description
Technical Field
The invention belongs to the field of security of a webpage SWF (shock wave flash, also called a flash file, and mainly used for animation of a browser, video playing and the like) file, and particularly relates to an encryption and decryption method and device of a flash file.
Background
At present, most of existing large video websites including live websites adopt SWF files to play video files, and the SWF files integrate video decoding work, including the functions of decoding and displaying barrage of the live websites. Therefore, the protection of the SWF file can well protect the core logic of the video decoding algorithm and the logic of the barrage decoding. At present, the SWF file is written by an ActionScript, a corresponding script code (equivalent to a pseudo code) can be reversely compiled by a third-party tool such AS (AS 3 sorcer), and the specific implementation logic of the script can be very easily known by reading the pseudo code.
Disclosure of Invention
The technical problem of the invention is mainly solved by the following technical scheme:
an encryption and decryption method for a flash file comprises the following steps:
step 1, setting a core logic SWF file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by C language and encrypted by a custom algorithm, and a file with a custom extension is generated after encryption; the file support of the custom extension is called by ActionScript;
and 2, setting a shell SWF file, wherein the shell SWF file comprises a decryption interface, the decryption interface comprises a decryption code written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, and the file with the defined extension name in the step 1 is called through the decryption interface, decrypted to generate the SWF file and loaded.
The invention creatively sets 2 SWF files, one is a shell SWF file, and the other is a core logic SWF file. Wherein the shell SWF is used for loading the SWF file of the core, the core SWF file is encrypted by using an encryption algorithm, and the core logic loading the SWF file in the shell SWF file is put into the C code. The C code can be called by ActionScript, and the purpose of adopting C as bit core logic is that the reverse disassembly code of the C code is relatively difficultly understand the logic (relative to the reverse pseudo code of the ActionScript). Therefore, the protection scheme better plays a role in the possibility of cracking the SWF file, and the SWF file transmitted in the network is encrypted and cannot be directly acquired to a plaintext.
Preferably, in step 1, the core logic content is encrypted by using an AES encryption algorithm, specifically, the SWF file is read from the disk into the memory, then the content of the SWF file is used as a data input source to be encrypted, the encrypted SWF file is written into the disk file, and the extension of the encrypted SWF file is modified into the custom extension.
Preferably, in the step 1, after the core logic content is encrypted by using an AES encryption algorithm, secondary encryption is performed by using a custom-written encryption algorithm, then the content of the SWF file is used as a data input source for encryption, the encrypted SWF file is written into a disk file, and the extension of the encrypted SWF file is modified into a custom extension; after the second encryption, in step 2, the decryption interface comprises the second decryption, both decryption codes written in the C language are used, and the written decryption logics respectively correspond to the AES encryption algorithm in step 1 and the custom-written encryption algorithm.
Preferably, the decryption interface format is DecodeData (void × pData, int nLen); pData is input encrypted data, decrypted data also exists in pData, and nLen is identification data length.
Preferably, in the step 2, the encrypted core logic SWF file is stored in the internet cloud, the shell SWF file acquires the encrypted core logic SWF file from the internet cloud through a URLStream function in the ActionScript, registers a complete event, and decrypts the encrypted core logic SWF file through a decryption interface in the complete event.
An encryption and decryption apparatus for a flash file, comprising:
a core logic SWF file setting module: the system comprises a core logic SWF file, a custom algorithm and a custom extension file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by adopting C language and encrypted by adopting the custom algorithm, and the custom extension file is generated after the encryption; the file support of the custom extension is called by ActionScript;
a shell SWF file setting module: the method is used for setting a shell SWF file, the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, the file with the defined extension name in the step 1 is called through the decryption interface, and the SWF file is generated after decryption and loading.
Preferably, the core logic SWF file setting module encrypts the SWF file by using an AES encryption algorithm, specifically, reads the SWF file from the disk into the memory, encrypts the content of the SWF file as a data input source, writes the encrypted SWF file into the disk file, and modifies the extension of the encrypted SWF file into the custom extension.
Preferably, the core logic SWF file setting module encrypts the core logic content by adopting an AES encryption algorithm, secondarily encrypts the core logic content by adopting a custom-written encryption algorithm, then encrypts the content of the SWF file as a data input source, writes the encrypted SWF file into a disk file, and modifies the extension of the encrypted SWF file into a custom extension; after the second encryption, in step 2, the decryption interface comprises the second decryption, both decryption codes written in the C language are used, and the written decryption logics respectively correspond to the AES encryption algorithm in step 1 and the custom-written encryption algorithm.
Preferably, the decryption interface format is DecodeData (void × pData, int nLen); pData is input encrypted data, decrypted data also exists in pData, and nLen is identification data length.
Preferably, the encrypted core logic SWF file is stored in the network cloud, the shell SWF file setting module acquires the encrypted core logic SWF file from the network cloud through a URLStream function in the ActionScript, registers a complete event, and decrypts the encrypted core logic SWF file through a decryption interface in the complete event.
Therefore, the invention has the following advantages: the method can reduce the possibility of cracking the SWF file, and can ensure that the SWF file transmitted in the network is encrypted and cannot directly acquire the plaintext.
Drawings
FIG. 1 is a schematic flow diagram of a method of the present invention.
Fig. 2 is a connection block diagram of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
An encryption and decryption method for a flash file comprises the following steps:
step 1, setting a core logic SWF file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by C language and encrypted by a custom algorithm, and a file with a custom extension is generated after encryption; the file support of the custom extension is called by ActionScript;
the core logic content is encrypted by adopting an AES encryption algorithm, specifically, an SWF file is read from a disk into a memory, then the content of the SWF file is used as a data input source for encryption, the encrypted SWF file is written into the disk file, and the extension of the encrypted SWF file is modified into a custom extension.
Secondly, encrypting the core logic content by adopting an AES encryption algorithm, then encrypting the core logic content by adopting a custom-written encryption algorithm for the second time, then encrypting the content of the SWF file as a data input source, writing the encrypted SWF file into a disk file, and modifying the extension of the encrypted SWF file into a custom extension; after the second encryption, in step 2, the decryption interface comprises the second decryption, both decryption codes written in the C language are used, and the written decryption logics respectively correspond to the AES encryption algorithm in step 1 and the custom-written encryption algorithm.
Step 2, setting a shell SWF file, wherein the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, and the file with the defined extension name in the step 1 is called through the decryption interface, decrypted, generated into an SWF file and loaded; the format of the decryption interface is DecodeData (void pData, int nLen); pData is input encrypted data, decrypted data also exists in pData, and nLen is identification data length.
The encrypted core logic SWF file is stored in a network cloud end, the shell SWF file acquires the encrypted core logic SWF file from the network cloud end through a URLStream function in ActionScript, a COMPLET event is registered, and the downloaded encrypted core logic SWF file is decrypted in the COMPLET event through a decryption interface.
An encryption and decryption apparatus for a flash file, comprising:
a core logic SWF file setting module: the system comprises a core logic SWF file, a user-defined extension name generation module and a data processing module, wherein the core logic SWF file is used for setting a core logic SWF file, the core logic SWF file comprises core logic contents, the core logic contents are written by adopting C language and are encrypted by adopting a user-defined algorithm, and a file with the user-defined extension name is generated after the core logic contents are encrypted; the file support of the custom extension is called by ActionScript;
the core logic SWF file setting module encrypts by adopting an AES encryption algorithm, specifically reads an SWF file from a disk into a memory, encrypts the content of the SWF file as a data input source, writes the encrypted SWF file into the disk file, and modifies the extension of the encrypted SWF file into a custom extension.
The core logic SWF file setting module encrypts the core logic content by adopting an AES encryption algorithm, secondarily encrypts the core logic content by adopting a custom-written encryption algorithm, then encrypts the content of the SWF file as a data input source, writes the encrypted SWF file into a disk file, and modifies the extension of the encrypted SWF file into a custom extension; after the second encryption, in step 2, the decryption interface comprises the second decryption, both decryption codes written in the C language are used, and the written decryption logics respectively correspond to the AES encryption algorithm in step 1 and the custom-written encryption algorithm.
A shell SWF file setting module: the method is used for setting a shell SWF file, the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, the file with the defined extension name in the step 1 is called through the decryption interface, and the SWF file is generated after decryption and loading.
The format of the decryption interface is DecodeData (void pData, int nLen); wherein, pData is input encrypted data, the decrypted data also exists in the pData, and nLen is the length of the identification data; the encrypted core logic SWF file is stored at a network cloud end, the shell SWF file setting module acquires the encrypted core logic SWF file from the network cloud end through a URLStream function in ActionScript, registers a COMPLET event, and decrypts the encrypted core logic SWF file through a decryption interface in the COMPLET event.
In the case of the example 1, the following examples are given,
the invention provides a method for encrypting and decrypting a flash file, which comprises the following steps:
step 1, compiling a core logic SWF file to meet the following conditions:
(1) the core logic is written in C language, and the calling of ActionScript to the C language is supported in the SWF file, so that the core logic is not easy to reverse.
(2) And (2) using an AES (Advanced encryption Standard) encryption algorithm for the core logic SWF file of the step (1), or adopting other encryption algorithms, and simultaneously encrypting the data once again by using an encryption and decryption algorithm written by the user (the encryption algorithm and the decryption algorithm are used in a matched mode). The encryption method is that the SWF file is read from a disk into a memory, the file content of the SWF file is used as a data input source, the encrypted data is written into the disk file, and the extension name of the SWF file is modified to be data. The advantage is that Hack can be prevented from knowing that it is an SWF file. Meanwhile, in order to better improve the security of the SWF file, the encryption and decryption algorithms can be replaced regularly (for example, once a week).
Step 2, compiling a shell SWF file to load the core SWF file in the step 1, wherein the core SWF file meets the following conditions:
(1) the decryption code is written by using a C code, wherein the decryption logic is to call an AES decryption algorithm or a decryption algorithm corresponding to other self-written encryption algorithm to decrypt the input data and provide an interface for ActionScript to call, the interface name can be DecodeData (void pData, int nLen) (wherein pData is the input encrypted data, the decrypted data also exists in pData, and nLen is the length of identification data), and the plaintext data can be acquired from the pData by calling the interface.
(2) One class in the shell SWF through ActionScript is URLStream, whose function is to retrieve the required data from the network. Its interface is load (request: URLRequest) void, where the parameter URLRequest is the URL path of the data downloaded from the server. In this context, the encrypted SWF file, i.e., the data file, described in (2) is downloaded. Meanwhile, the URLStream class provides an interface which can register events, register an Event of file downloading completion, and call the addEventListener interface of URLStream and transfer the parameter Event. Data of the whole data file can be acquired from the interface completeHandler parameter event.
(3) And (2) after the whole data can be acquired, the data needs to be decrypted, the loaded SWF file can be restored after decryption, the decryption method is a symmetric decryption method of an encryption method, and the decryption method is the decryption interface mentioned in the step 1.
(4) And loading the decrypted SWF file by using a class Loader provided in the ActionScript.
Example 2
The invention provides an encryption and decryption device for flash files, the device corresponds to the method in embodiment 1 one by one, and the expansion mode of the embodiment of the method can also be used in the embodiment of the device, which is not described herein again.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. An encryption and decryption method for a flash file is characterized by comprising the following steps:
step 1, setting a core logic SWF file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by C language and encrypted by a custom algorithm, and a file with a custom extension is generated after encryption; the file support of the custom extension is called by ActionScript;
the method comprises the steps that core logic content is encrypted by adopting an AES encryption algorithm, specifically, an SWF file is read from a disk into a memory, then the content of the SWF file is used as a data input source to be encrypted, the encrypted SWF file is written into the disk file, and the extension of the encrypted SWF file is modified into a custom extension;
secondly, encrypting the core logic content by adopting an AES encryption algorithm, then encrypting the core logic content by adopting a custom-written encryption algorithm for the second time, then encrypting the content of the SWF file as a data input source, writing the encrypted SWF file into a disk file, and modifying the extension of the encrypted SWF file into a custom extension;
step 2, setting a shell SWF file, wherein the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to the algorithm encrypted in the step 1, and the file with the defined extension name in the step 1 is called through the decryption interface, decrypted, generated into an SWF file and loaded; and after the second encryption, the decryption interface comprises second decryption, decryption codes written by C language are used, and the written decryption logics respectively correspond to the AES encryption algorithm in the step 1 and the custom-written encryption algorithm.
2. The method of claim 1, wherein the decryption interface format is decodeadata (void pData, int nLen); pData is input encrypted data, decrypted data also exists in pData, and nLen is identification data length.
3. The method according to claim 1, wherein in step 2, the encrypted SWF file of the core logic is stored in a cloud of the internet, the SWF file of the shell obtains the SWF file of the core logic from the cloud of the internet through a URLStream function in ActionScript, registers a complete event, and decrypts the SWF file of the core logic through a decryption interface in the complete event.
4. An encryption and decryption apparatus for a flash file, comprising:
a core logic SWF file setting module: the system comprises a core logic SWF file, a custom algorithm and a custom extension file, wherein the core logic SWF file comprises core logic contents, the core logic contents are written by adopting C language and encrypted by adopting the custom algorithm, and the custom extension file is generated after the encryption; the file support of the custom extension is called by ActionScript;
the method comprises the steps that core logic content is encrypted by adopting an AES encryption algorithm, specifically, an SWF file is read from a disk into a memory, then the content of the SWF file is used as a data input source to be encrypted, the encrypted SWF file is written into the disk file, and the extension of the encrypted SWF file is modified into a custom extension;
secondly, encrypting the core logic content by adopting an AES encryption algorithm, then encrypting the core logic content by adopting a custom-written encryption algorithm for the second time, then encrypting the content of the SWF file as a data input source, writing the encrypted SWF file into a disk file, and modifying the extension of the encrypted SWF file into a custom extension;
a shell SWF file setting module: the system comprises a shell SWF file, a core logic SWF file setting module and a shell SWF file, wherein the shell SWF file is used for setting a shell SWF file, the shell SWF file comprises a decryption interface, the decryption interface comprises decryption codes written by using C language, the written decryption logic corresponds to an encrypted algorithm in the execution flow of the core logic SWF file setting module, and the file defining an extension name in the execution flow of the core logic SWF file setting module is called through the decryption interface, decrypted and then generated into an SWF file, and loaded; and after the second encryption, the decryption interface comprises second decryption, decryption codes written by C language are used, and the written decryption logics respectively correspond to an AES encryption algorithm and a custom-written encryption algorithm in the execution flow of the core logic SWF file setting module.
5. The apparatus as claimed in claim 4, wherein the decryption interface format is DecodeData (void data, int nLen); pData is input encrypted data, decrypted data also exists in pData, and nLen is identification data length.
6. The device for encrypting and decrypting the flash file according to claim 5, wherein the encrypted core logic SWF file is stored in a network cloud, the shell SWF file setting module acquires the encrypted core logic SWF file from the network cloud through a URLStream function in ActionScript, registers a COMPLET event, and decrypts the encrypted core logic SWF file through a decryption interface for the downloaded encrypted core logic SWF file in the COMPLET event.
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| CN106933695B (en) * | 2017-02-28 | 2020-06-16 | 武汉斗鱼网络科技有限公司 | SWF file verification method and system |
| CN106941620B (en) * | 2017-03-31 | 2019-11-12 | 武汉斗鱼网络科技有限公司 | A kind of Flash resource loading method and device |
| CN110008654B (en) * | 2018-01-04 | 2021-04-09 | 北大方正集团有限公司 | Electronic file processing method and device |
| CN109740314A (en) * | 2018-12-27 | 2019-05-10 | 杭州当虹科技股份有限公司 | A kind of method that SWF obscures encryption |
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| CN102546824A (en) * | 2012-02-20 | 2012-07-04 | 沈文策 | Flash data transmission method and system, as well as server and client |
| CN102685129A (en) * | 2012-05-10 | 2012-09-19 | 苏州阔地网络科技有限公司 | Method and system for implementing information safety |
| CN104660589A (en) * | 2015-01-20 | 2015-05-27 | 中兴通讯股份有限公司 | Method and system for controlling encryption of information and analyzing information as well as terminal |
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| US20120101623A1 (en) * | 2010-10-22 | 2012-04-26 | Best Wise International Computing Co., Ltd. | Encryption Method of Digital Data, Decryption Method of Encrypted Digital Data, Manufacturing System of Storage Apparatus and Manufacturing Method Thereof |
| US9491222B2 (en) * | 2013-03-13 | 2016-11-08 | Nice-Systems Ltd. | System and method for interoperability between flex applications and .NET applications |
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| CN102546824A (en) * | 2012-02-20 | 2012-07-04 | 沈文策 | Flash data transmission method and system, as well as server and client |
| CN102685129A (en) * | 2012-05-10 | 2012-09-19 | 苏州阔地网络科技有限公司 | Method and system for implementing information safety |
| CN104660589A (en) * | 2015-01-20 | 2015-05-27 | 中兴通讯股份有限公司 | Method and system for controlling encryption of information and analyzing information as well as terminal |
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