CN100385422C - MP3 file encryption and decryption method - Google Patents
MP3 file encryption and decryption method Download PDFInfo
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- CN100385422C CN100385422C CNB2005100776155A CN200510077615A CN100385422C CN 100385422 C CN100385422 C CN 100385422C CN B2005100776155 A CNB2005100776155 A CN B2005100776155A CN 200510077615 A CN200510077615 A CN 200510077615A CN 100385422 C CN100385422 C CN 100385422C
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Abstract
The present invention discloses an MP3 file encryption and decryption method. Before the MP3 file is downloaded to a mobile phone having the function of playing the MP3 file, an encryption tool at a computer terminal is adopted to encrypt the MP3 file in the computer. When the MP3 file is downloaded to the mobile phone from the computer and is played simultaneously, a decryption tool in the mobile phone is adopted to decrypt the MP3 file. Therefore, a user can be prevented from copying the MP3 file to other mobile phones having the function of playing the MP3 file so as to achieve the purpose of protecting the copyright of the MP3 file.
Description
Technical field
The present invention relates to a kind of encryption and decryption method of mp3 file, relate in particular to a kind of encryption and decryption method that adopts the mp3 file that mobile phone plays.
Background technology
MP3 is the abbreviation of MPEG Audio Layer 3, i.e. the 3rd layer of international standard compress technique.MP3 has high performance ratio of compression, is fit to narrower Network Transmission environment at present, day by day becomes the transmission standard of online digital music.
For convenience of the user, at present increasing cell phone manufacturer successfully is integrated in the mp3 file playing function in the mobile phone, thereby makes the cellphone subscriber not need to buy in addition the special mobile phone with mp3 file playing function, can enjoy the MP3 music.Now become the main mode that the cellphone subscriber with mp3 file playing function obtains the MP3 music by network download, the mobile phone with mp3 file playing function becomes the first-selection of people's enjoy music just day by day.
Yet, because mobile phone has the transmission interface of USB or other form, and make the user mp3 file that is stored in the mobile phone can be copied to other mobile phone or upward use of device, and then invade the digital publishing rights of described mp3 file.
Summary of the invention
The objective of the invention is to provide a kind of encryption and decryption method of mp3 file, avoid the user that mp3 file is copied on other mobile phone with mp3 file playing function and use at the defective that above-mentioned prior art exists, thus the copyright of protection mp3 file.
For achieving the above object, the encryption of mp3 file of the present invention and decryption method adopt an Encryption Tool that is positioned at computer terminal that the mp3 file of computing machine is encrypted, and adopt a decoding tool that is positioned at mobile phone to by the mp3 file deciphering of downloaded to this mobile phone with mp3 file playing function, comprise the steps:
(1) Encryption Tool of computer terminal is judged the length value of mp3 file mark, if the length value of mp3 file mark＞0 is then revised the mp3 file mark so that the decoding tool in the mobile phone is discerned, and made new mp3 file mark and mp3 file frame synchronization; If this length value≤0, represent not add in this mp3 file the telegram end that mp3 file mark or mp3 file mark are written into mp3 file, write the header that new mp3 file is marked on mp3 file this moment, so that decoding tool is discerned, and make described new mp3 file mark and mp3 file frame synchronization;
(2) Encryption Tool is encrypted frame by frame to the mp3 file content then, and cryptographic keys is the intrinsic identification code of mobile phone itself;
(3) in ciphering process, mp3 file produces the frame synchronization skew, after encryption finishes, the frame synchronization side-play amount is write in the described mp3 file;
(4) the interior decoding tool of mobile phone with mp3 file playing function reads and obtains the length value and the mp3 file frame synchronization side-play amount of the new mp3 file mark after Encryption Tool is encrypted, and then returns the reference position of mp3 file frame;
(5) the player buffer zone of mobile phone reads the mp3 file content, and decoding tool is deciphered frame by frame to the mp3 file content simultaneously, and decryption key is the intrinsic identification code of this mobile phone itself.
As mentioned above; the encryption of mp3 file of the present invention and decryption method are by the encryption of above-mentioned Encryption Tool and the deciphering of decoding tool; avoid the user that mp3 file is copied on other mobile phone with mp3 file playing function and used, thereby reached the purpose of protecting the mp3 file copyright.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the encryption of mp3 file of the present invention and the encryption flow figure of decryption method;
Fig. 2 is the encryption of mp3 file of the present invention and the deciphering process flow diagram of decryption method.
Embodiment
The encryption and the decryption method of mp3 file of the present invention comprise the steps: (1) in download to one have the mobile phone of mp3 file playing function before, adopt an Encryption Tool that is positioned at computer terminal that the mp3 file of computing machine is encrypted; (2) encrypt and to this mobile phone and when playing, adopt the decoding tool that is positioned at mobile phone that this mp3 file is deciphered through described Encryption Tool when this mp3 file by downloaded.
See also Fig. 1, ciphering process comprises the steps:
(1) described Encryption Tool is chosen mp3 file, and then learn the length value of mp3 file mark, described mp3 file mark is used for indicating related data messages such as the author, singer, days, affiliated special edition of every first song correspondence, during broadcast, these data informations can be read and show to the mp3 file player that is positioned at mobile phone;
(2), and make new mp3 file mark and mp3 file frame synchronization if the mp3 file mark is then revised so that decoding tool is discerned in the length value of mp3 file mark＞0; If this length value≤0, represent not add in this mp3 file the telegram end that mp3 file mark or mp3 file mark are written into mp3 file, write the header that new mp3 file is marked on mp3 file this moment, so that decoding tool is discerned, and make described new mp3 file mark and mp3 file frame synchronization;
(3) then, Encryption Tool reads the mp3 file content and uses TEA (Tiny EncryptionAlgorithm) algorithm that the mp3 file content is encrypted frame by frame, cryptographic keys is that manufacturer is the fixing identification code that this mobile phone with mp3 file playing function is provided with, in present embodiment, be the intrinsic IMEI of this mobile phone (IMEI);
(4) mp3 file can produce the frame synchronization skew in ciphering process, after the mp3 file content-encrypt is finished, the frame synchronization side-play amount is write in the described mp3 file, so far encrypts and finishes.
After encrypting end, the mp3 file in the computing machine is downloaded to by the USB transmission interface in the mobile phone with mp3 file playing function, and during broadcast, mp3 file is deciphered the limit frame by frame by the limit and play in this mobile phone.
See also Fig. 2, decrypting process comprises the steps:
(1) decoding tool at first reads mp3 file, check whether mp3 file is encrypted through above-mentioned Encryption Tool, if do not pass through the encryption of above-mentioned Encryption Tool, decoding tool can't be discerned this mp3 file, if encryption through above-mentioned Encryption Tool, then obtain the length value and the mp3 file frame synchronization side-play amount of the new mp3 file mark after this Encryption Tool is encrypted simultaneously, and then return the reference position of mp3 file frame;
(2) then, the player buffer zone of mobile phone begins to read the mp3 file content, decoding tool uses the TEA algorithm that the mp3 file content is deciphered frame by frame afterwards, decryption key is that manufacturer is the fixing identification code that this mobile phone with mp3 file playing function is provided with, in this embodiment, be the intrinsic IMEI of this mobile phone (IMEI);
(3) decrypted mp3 file frame is to be played in player buffer zone etc., and player is play the mp3 file frame of deciphering in the buffer zone, all finishes up to the mp3 file content, and so far the decrypting process of whole M P3 file finishes.
It is to be noted this mp3 file encryption and decryption method is particularly useful for without permission or pirate mp3 file, to reach the purpose of protection MP3 copyright.
Claims (5)
1. the encryption of a mp3 file and decryption method, it is characterized in that, adopt an Encryption Tool that is positioned at computer terminal that the mp3 file of computing machine is encrypted, and adopt a decoding tool that is positioned at mobile phone to by the mp3 file deciphering of downloaded to this mobile phone with mp3 file playing function, comprise the steps:
(1) Encryption Tool of computer terminal is judged the length value of mp3 file mark, if the length value of mp3 file mark＞0 is then revised the mp3 file mark so that the decoding tool in the mobile phone is discerned, and made new mp3 file mark and mp3 file frame synchronization; If this length value≤0, represent not add in this mp3 file the telegram end that mp3 file mark or mp3 file mark are written into mp3 file, write the header that new mp3 file is marked on mp3 file this moment, so that decoding tool is discerned, and make described new mp3 file mark and mp3 file frame synchronization;
(2) Encryption Tool is encrypted frame by frame to the mp3 file content then, and cryptographic keys is the intrinsic identification code of mobile phone itself;
(3) in ciphering process, mp3 file produces the frame synchronization skew, after encryption finishes, the frame synchronization side-play amount is write in the described mp3 file;
(4) the interior decoding tool of mobile phone with mp3 file playing function reads and obtains the length value and the mp3 file frame synchronization side-play amount of the new mp3 file mark after Encryption Tool is encrypted, and then returns the reference position of mp3 file frame;
(5) the player buffer zone of mobile phone reads the mp3 file content, and decoding tool is deciphered frame by frame to the mp3 file content simultaneously, and decryption key is the intrinsic identification code of this mobile phone itself.
2. the encryption of mp3 file as claimed in claim 1 and decryption method is characterized in that, adopt the TEA algorithm as encrypting and decipherment algorithm.
3. the encryption of mp3 file as claimed in claim 1 and decryption method is characterized in that, described encryption and decryption key are the intrinsic IMEI of this mobile phone itself.
4. the encryption of mp3 file as claimed in claim 1 and decryption method, it is characterized in that, described mp3 file mark is used for indicating the related data message of every first song correspondence, and during broadcast, these data informations can be read and show to the mp3 file player that is positioned at mobile phone.
5. the encryption of mp3 file as claimed in claim 1 and decryption method, it is characterized in that, described step (4) also comprises: whether as calculated the decoding tool in the mobile phone at first reads and checks the mp3 file interior Encryption Tool encryption of machine, if do not encrypt, then decoding tool can't be discerned this mp3 file, if, then read the length value and the mp3 file frame synchronization side-play amount of mp3 file mark through encrypting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100776155A CN100385422C (en) | 2005-06-21 | 2005-06-21 | MP3 file encryption and decryption method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100776155A CN100385422C (en) | 2005-06-21 | 2005-06-21 | MP3 file encryption and decryption method |
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| CN1885279A CN1885279A (en) | 2006-12-27 |
| CN100385422C true CN100385422C (en) | 2008-04-30 |
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| CNB2005100776155A Expired - Fee Related CN100385422C (en) | 2005-06-21 | 2005-06-21 | MP3 file encryption and decryption method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101127878B (en) * | 2007-09-13 | 2013-07-03 | 深圳市融创天下科技股份有限公司 | An encryption and decryption method for video stream media programs |
| CN101980237A (en) * | 2010-10-13 | 2011-02-23 | 中兴通讯股份有限公司 | Data encryption method and mobile terminal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383056A (en) * | 2001-04-24 | 2002-12-04 | Lg电子株式会社 | Conversion and reproduction method for audio data of portable device |
| CN1477523A (en) * | 2002-08-19 | 2004-02-25 | 乐金电子（惠州）有限公司 | Method for recording and reproducing compacted voice file by using decryption key |
| WO2004092931A2 (en) * | 2003-04-17 | 2004-10-28 | Koninklijke Philips Electronics N.V. | Method and system for managing digital rights |
| US20040236945A1 (en) * | 2003-05-21 | 2004-11-25 | Hank Risan | Method and system for controlled media sharing in a network |
| WO2005031593A1 (en) * | 2003-09-30 | 2005-04-07 | Inka Entworks, Inc. | A method of synchronizing data between contents providers and a portable device via network and a system thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383056A (en) * | 2001-04-24 | 2002-12-04 | Lg电子株式会社 | Conversion and reproduction method for audio data of portable device |
| CN1477523A (en) * | 2002-08-19 | 2004-02-25 | 乐金电子（惠州）有限公司 | Method for recording and reproducing compacted voice file by using decryption key |
| WO2004092931A2 (en) * | 2003-04-17 | 2004-10-28 | Koninklijke Philips Electronics N.V. | Method and system for managing digital rights |
| US20040236945A1 (en) * | 2003-05-21 | 2004-11-25 | Hank Risan | Method and system for controlled media sharing in a network |
| WO2005031593A1 (en) * | 2003-09-30 | 2005-04-07 | Inka Entworks, Inc. | A method of synchronizing data between contents providers and a portable device via network and a system thereof |
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