CN103106901A - Audio digital steganography and extraction method in compressed domain based on index values - Google Patents
Audio digital steganography and extraction method in compressed domain based on index values Download PDFInfo
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Abstract
The invention discloses an audio digital steganography and extraction method in a compressed domain based on index values. A steganography operation of the digital steganography method is carried out in the processes of quantization and entropy encoding, so distortion caused by steganography can be controlled effectively with the help of a distortion adjustment mechanism, therefore, steganography safety of secret information is guaranteed effectively, and undetectability and transparency of the secret information are guaranteed. By means of the audio digital extraction method, bits of the secret information are extracted directly through index values of audio particles, and the extraction process is simple and effective. Due to the fact that the index values of the audio particles can be extracted from side information of the audio particles, the audio particles need not to be decoded, namely, such complex procedures as anti-entropy decoding, inverse quantization, inverse modified discrete cosine transform (MDCT) and inverse filtering, and thus timeliness of secret information extraction is improved effectively and computation complexity is reduced greatly.
Description
Technical field
The present invention relates to a kind of multimedia secret communication safety technique, especially relate to a kind of compressed domain audio steganography and extracting method based on index value.
Background technology
Along with the fast development of multimedia technology and Internet technology, multimedia communication has become the important means that people carry out information interchange, and information security also seems more and more important with secret.Steganography is one of important topic of present information security field, and it is take digital multimedia as masking carrier, and the secret information that needs are sent is embedded in carrier, transmits by overt channel not cause the extraneous mode of noting.
From the requirement of steganography to masking carrier, compressed domain audio such as MPEG-1 Layer III(are hereinafter to be referred as MP3), very easily to become hidden a kind of masking carrier of writing object, this is mainly because compressed domain audio is very common and popular in the internet, carry out hiding of secret information in this class carrier, have very strong fascination; On the other hand, compressed domain audio has larger document size with respect to text and image, is convenient to hide more secret information.At present existing multiple hidden writing tools based on MP3, as MP3Stego, MP3Stegz and Stego-Lame etc., wherein classical with the MP3Stego of the Petitcolas of univ cambridge uk exploitation and be widely used again, its be mainly parity according to block length after quantization encoding as the hidden foundation of writing, before and after hidden writing, the perceived quality of MP3 compressed domain audio keeps good.Yet, some scholar has also proposed the Stego-detection method for MP3Stego, point out in the paper " Detecting low embedding rates " of delivering in the IH2002 meeting as Westfeld (" the low detection method that embeds speed ") through MP3Stego is hidden write before and after the block length statistical distribution of MP3 compressed domain audio change to some extent; Think in the paper that Qiao etc. deliver " Steganalysis of MP3Stego " (" for the Steganalysis of MP3Stego ") that the continuity between the distribution of consecutive frame coefficient also is subject to the impact of the hidden write operation of MP3Stego in the IJCNN2009 meeting.This shows, the MP3Stego method is still waiting further raising aspect security.
Although some steganography methods take compressed domain audio as masking carrier occurred at present, still had room for promotion at aspects such as steganographic capacity, undetectabilities.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of compressed domain audio steganography and extracting method based on index value, it can keep compatible with the audio compression coding standard, can guarantee effectively that the hidden of secret information write security, and undetectability and the perception transparency is high, computation complexity is low.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of compressed domain audio steganography method based on index value is characterized in that specifically comprising the following steps:
1. at the steganography end, pending not compressed audio as current not compressed audio, and is givenly treated the hidden scale-of-two secret information bit stream of writing;
2. in the compressed domain audio cataloged procedure, take the audio frequency particle as unit, current not compressed audio is carried out encoding compression processing, take out a pending audio frequency particle from current not compressed audio, and will this pending audio frequency particle as current audio frequency particle;
3. utilize bank of filters to carry out filtering to current audio frequency particle and process, obtain the audio frequency particle after filtering is processed; And utilize psychoacoustic model that current audio frequency particle is processed, and the type of the window that the audio frequency particle after obtaining filtering is processed need adopt when carrying out windowing process, the letter that reaches each scale factor band corresponding to current audio frequency particle is covered ratio;
The type of the window that need adopt during 4. according to the audio frequency particle windowing process after the filtering processing, the audio frequency particle after filtering is processed carries out Modified Discrete Cosine Transform to be processed, and obtains Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle;
5. take out from treat the hidden scale-of-two secret information bit stream of writing and treat the hidden secret information bit of writing, then according to the index value of the scale factor for the treatment of the hidden secret information bit of writing and Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle, determine whether to embed in current audio frequency particle and treat the hidden secret information bit of writing, and determine whether to revise the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient that when obtaining encoding, current audio frequency particle is corresponding;
6. the letter of each the scale factor band corresponding according to current audio frequency particle cover than with the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle of when coding, Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle quantized to encode with entropy;
7. take out next pending audio frequency particle as current audio frequency particle from current not compressed audio, then return to step and 3. continue to carry out, until all the audio frequency particle disposal in current not compressed audio are complete, obtain containing the compressed audio of secret information;
8. the steganography end sends and contains the compressed audio of secret information to the digital extraction end.
Described step detailed process 5. is:
5.-1, judgement is used for whether the value whether expression repeat to embed the zone bit flag of secret information bit is 0, if, take out a new secret information bit and treat the hidden secret information bit of writing as current from treat the hidden scale-of-two secret information bit stream of writing, otherwise, take out the secret information bit of preserving in last secret information bit telescopiny, treat the hidden secret information bit of writing as current, wherein, the initial value of flag is 0;
5.-2, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient corresponding according to current audio frequency particle, need in current audio frequency particle to determine the secret information bit of embedding, detailed process is: if index value corresponding to current audio frequency particle belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 0 "; If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 1 ";
5.-3, judge that whether index value corresponding to current audio frequency particle be 14 and currently treat whether the hidden secret information bit of writing is bit " 1 ", if the index value that current audio frequency particle is corresponding is 14 and currently treats that the hidden secret information bit of writing is bit " 1 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-4;
5.-4, judge that whether index value corresponding to current audio frequency particle is 15, if so, does not embed the secret information bit in current audio frequency particle, then preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, then execution in step 6., otherwise, execution in step 5.-5;
5.-5, judge that whether index value corresponding to current audio frequency particle be 4 or 11 or 12 or 13 and currently treat whether the hidden secret information bit of writing is bit " 0 ", if the index value that current audio frequency particle is corresponding is 4 or 11 or 12 or 13 and currently treat that the hidden secret information bit of writing is bit " 0 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-6;
5. the secret information bit that-6, judges need embedding in current audio frequency particle treats with current whether the hidden secret information bit of writing is consistent, if consistent, index value corresponding to current audio frequency particle do not modified, realization embeds the current hidden secret information bit of writing for the treatment of in current audio frequency particle, then execution in step 6., otherwise, execution in step 5.-7;
If 5.-7 currently treat that the hidden secret information bit of writing is bit " 0 ", index value corresponding to current audio frequency particle is revised as the first index value subset { 0,1,2,3,8,9,10,14,15 } index value of first satisfied replacement condition in is realized embedding the current hidden secret information bit of writing for the treatment of in current audio frequency particle, and then execution in step 6.; If currently treat that the hidden secret information bit of writing is bit " 1 ", index value corresponding to current audio frequency particle is revised as the second index value subset { 4,5,6,7,11,12,13 } index value of first satisfied replacement condition in is realized embedding the current hidden secret information bit of writing for the treatment of in current audio frequency particle, and then execution in step 6.; At this, the replacement condition is: the required bit number of scale factor of two groups of scale factor bands of the current audio frequency particle of coding that the index value after replacement is indicated is not less than the required bit number of scale factor of two groups of scale factor bands replacing the indicated current audio frequency particle of coding of front index value.
A kind of compressed domain audio digital extraction method based on index value is characterized in that specifically comprising the following steps:
1) the digital extraction termination is received the compressed audio that contains secret information that the steganography end sends;
2) at the digital extraction end, to the compressed audio that the contains secret information processing of decoding, take out a pending audio frequency particle take the audio frequency particle as unit from the compressed audio that contains secret information, and will this pending audio frequency particle as current audio frequency particle;
3) current audio frequency particle is decoded, then extract index value corresponding to current audio frequency particle from the side information that decoding obtains;
4) according to index value corresponding to current audio frequency particle, determine whether and to carry out the extraction of secret information bit to current audio frequency particle, after determining to carry out the extraction of secret information bit to current audio frequency particle, determine the concrete bit value of the secret information bit that extracts;
5) take out next pending audio frequency particle as current audio frequency particle from the compressed audio that contains secret information, then returning to step 3) continues to carry out, until all audio frequency particle disposal that contain in the compressed audio of secret information are complete, obtain containing the hidden scale-of-two secret information bit stream of writing in the compressed audio of secret information.
The detailed process of described step 4) is:
4)-1, judge whether index value corresponding to current audio frequency particle is 15, if, determining does not need current audio frequency particle is carried out the extraction of secret information bit, then execution in step 5), otherwise, determine and need to carry out the extraction of secret information bit to current audio frequency particle, then execution in step 4)-2;
4) if-2 index values corresponding to current audio frequency particle belong to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extract the secret information bit from current audio frequency particle, and be bit " 0 ", then execution in step 5); If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, extract the secret information bit from current audio frequency particle, and be bit " 1 ", then execution in step 5).
Compared with prior art, the invention has the advantages that:
1) owing to quantizing and entropy coding link, the distortion adjustment mechanism of audio compression coding standard can be controlled the distortion that quantizes to introduce, to satisfy the auditory perceptual characteristic, and the hidden write operation of steganography method of the present invention occurs in quantification and entropy cataloged procedure, therefore the distortion of being introduced by hidden writing also can be effectively controlled by distortion reconditioner system, thereby what effectively guaranteed secret information hiddenly writes security, has guaranteed undetectability and the perception transparency of secret information.
2) digital extraction method of the present invention directly extracts the secret information bit by the index value of audio frequency particle, leaching process is simply effective, and because can extracting from the side information of audio frequency particle, the index value of audio frequency particle obtains, therefore need not the audio frequency particle is decoded, namely need not to experience the complicated links such as anti-entropy coding, inverse quantization, contrary MDCT conversion and liftering, thereby effectively improved the real-time of extracting the secret information process, greatly reduced simultaneously computation complexity.
Description of drawings
Fig. 1 is the process schematic diagram of compressed domain audio compression and coding standard;
Fig. 2 is the FB(flow block) of steganography method of the present invention;
Fig. 3 is the hidden process schematic diagram of writing of the concrete secret information of steganography method of the present invention;
Fig. 4 is the FB(flow block) of digital extraction method of the present invention;
Fig. 5 is the concrete secret information leaching process schematic diagram of digital extraction method of the present invention.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
Therefore in MP3 compressed domain audio cataloged procedure, the required bit number (indicated by index value) of the scale factor of two groups of scale factor bands of each audio frequency particle of encoding has certain dirigibility, can realize that the hidden of secret information write by this dirigibility.Fig. 1 is the process of compressed domain audio compression and coding standard, and compressed audio audio frequency particle data after processing through bank of filters, does not carry out Modified Discrete Cosine Transform, quantize with the entropy coding before can first determine index value.
The present embodiment has proposed a kind of compressed domain audio steganography method based on index value on the basis of compressed domain audio compression and coding standard process shown in Figure 1, its FB(flow block) specifically comprises the following steps as shown in Figure 2:
1. at the steganography end, pending not compressed audio as current not compressed audio, and is givenly treated the hidden scale-of-two secret information bit stream of writing.
At this, the hidden scale-of-two secret information bit stream of writing can be user's Set arbitrarily in given treating; In the present embodiment, suppose that the given hidden scale-of-two secret information bit stream of writing for the treatment of is " 01010100 ".
2. due in the compressed domain audio cataloged procedure, take the audio frequency particle as unit, current not compressed audio is carried out encoding compression processing, therefore take out a pending audio frequency particle at this from current not compressed audio, and this audio frequency particle is defined as current audio frequency particle.
3. utilize bank of filters to carry out filtering to current audio frequency particle and process, obtain the audio frequency particle after filtering is processed; And utilize psychoacoustic model that current audio frequency particle is processed, and the type of the window that the audio frequency particle after obtaining filtering is processed need adopt when carrying out windowing process, the letter that reaches each scale factor band corresponding to current audio frequency particle is covered ratio.
The type of the window that need adopt during 4. according to the audio frequency particle windowing process after the filtering processing, the audio frequency particle after filtering is processed carries out Modified Discrete Cosine Transform to be processed, and obtains Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle.
5. take out from treat the hidden scale-of-two secret information bit stream of writing and treat the hidden secret information bit of writing, then according to until the index value of the scale factor of the hidden secret information bit of writing and Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle (required bit number when index value is used to indicate the scale factor of two groups of scale factor bands of the current audio frequency particle of coding, the span of index value is 0～15), determine whether to embed in current audio frequency particle and treat the hidden secret information bit of writing, and determine whether to revise the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient that when obtaining encoding, current audio frequency particle is corresponding.
In this specific embodiment, step detailed process 5. is:
5.-1, judgement is used for whether the value whether expression repeat to embed the zone bit flag of secret information bit is 0, if, take out a new secret information bit and treat the hidden secret information bit of writing as current from treat the hidden scale-of-two secret information bit stream of writing, otherwise, take out the secret information bit of preserving in last secret information bit telescopiny, treat the hidden secret information bit of writing as current, wherein, the initial value of flag is 0.
5.-2, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient corresponding according to current audio frequency particle, need in current audio frequency particle to determine the secret information bit of embedding, detailed process is: if index value corresponding to current audio frequency particle belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 0 "; If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 1 ".
due to when embedding the secret information bit, following special circumstances can appear, namely when index value be 14 or 15 and current when the hidden secret information bit of writing is bit " 1 ", need index value is adjusted replacement, namely need to seek an index value and substitute original index value from the second index value subset, the replacement condition is: the required bit number of scale factor of two groups of scale factor bands of coding that the index value after replacement is indicated is not less than original required bit number, at this moment, find not satisfy in the second index value subset the index value of this condition, that is to say, when index value is 14 or 15, can not embed secret information bit " 1 " by above-mentioned rule, in addition, when index value is 4 or 11 or 12 or 13 and current when the hidden secret information bit of writing is bit " 0 ", by Substitution Rules, satisfactory in the first index value subset is 14 and 15, existence due to front a kind of special circumstances, can't judge at the digital extraction end value is whether 14 or 15 index value contains secret information, this will finally cause index value is 4 or 11 or 12 or also can't embed secret information bit " 0 " at 13 o'clock, for above problem, the present invention proposes following solution: be 14 and current when the hidden secret information bit of writing is bit " 1 " when index value occurring, index value be 15(no matter current be bit " 0 " or " 1 " until the hidden secret information bit of writing) and index value be 4 or 11 or 12 or 13 and current when the hidden secret information bit of writing is this three kinds of situations of bit " 0 ", directly index value is set to 15 and flag is set to 1, treat that to current the hidden secret information bit of writing preserves simultaneously, when next audio frequency particle is carried out embedding operation, the front secret information bit of once preserving is embedded once again, until meet the demands, step 5.-3 to step 5.-7 has provided the concrete telescopiny of secret information bit.
5.-3, judge that whether index value corresponding to current audio frequency particle be 14 and currently treat whether the hidden secret information bit of writing is bit " 1 ", if the index value that current audio frequency particle is corresponding is 14 and currently treats that the hidden secret information bit of writing is bit " 1 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, index value corresponding to current audio frequency particle when amended index value 15 is coding, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-4.
5.-4, judge whether index value corresponding to current audio frequency particle is 15, if, do not embed the secret information bit in current audio frequency particle, and do not revise index value, with direct index value corresponding to current audio frequency particle when encoding of this index value 15, then preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, again execution in step 6., otherwise, execution in step 5.-5.
5.-5, judge that whether index value corresponding to current audio frequency particle be 4 or 11 or 12 or 13 and currently treat whether the hidden secret information bit of writing is bit " 0 ", if the index value that current audio frequency particle is corresponding is 4 or 11 or 12 or 13 and currently treat that the hidden secret information bit of writing is bit " 0 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, index value corresponding to current audio frequency particle when amended index value 15 is coding, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-6.
5. the secret information bit that-6, judges need embedding in current audio frequency particle treats with current whether the hidden secret information bit of writing is consistent, if consistent, index value corresponding to current audio frequency particle do not modified, with direct index value corresponding to current audio frequency particle when encoding of this index value, realization embeds the current hidden secret information bit of writing for the treatment of in current audio frequency particle, then execution in step 6., otherwise, execution in step 5.-7.
If 5.-7 currently treat that the hidden secret information bit of writing is bit " 0 ", is revised as the first index value subset { 0,1 with index value corresponding to current audio frequency particle, 2,3,8,9,10,14,15 } index value of first satisfied replacement condition in, with amended index value as index value corresponding to current audio frequency particle of when coding, realization embeds the current hidden secret information bit of writing for the treatment of in current audio frequency particle, then execution in step 6.; If currently treat that the hidden secret information bit of writing is bit " 1 ", index value corresponding to current audio frequency particle is revised as the second index value subset { 4,5,6,7,11,12,13 } index value of first satisfied replacement condition in, with amended index value as index value corresponding to current audio frequency particle of when coding, realization embeds the current hidden secret information bit of writing for the treatment of in current audio frequency particle, then execution in step 6.; At this, the replacement condition is: the required bit number of scale factor of two groups of scale factor bands of the current audio frequency particle of coding that the index value after replacement is indicated is not less than the required bit number of scale factor of two groups of scale factor bands replacing the indicated current audio frequency particle of coding of front index value.
6. the letter of each the scale factor band corresponding according to current audio frequency particle cover than with the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle of when coding, Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle quantized to encode with entropy.
7. take out next pending audio frequency particle as current audio frequency particle from current not compressed audio, then return to step and 3. continue to carry out, until all the audio frequency particle disposal in current not compressed audio are complete, obtain containing the compressed audio of secret information.
8. the steganography end sends and contains the compressed audio of secret information to the digital extraction end.
At this, as example, the hidden process of writing of concrete secret information bit is described as treating the hidden scale-of-two secret information bit stream of writing take " 01010100 ".
Foregoing three kinds of special circumstances can occur during due to embedding, therefore need more than 8 audio frequency particles embed above-mentioned 8 bit informations.The span of index value is 0 ~ 15, size is with specifically the compressed audio particle is not relevant, this the hypothesis continuous 11 not the index value of compressed audio particle be respectively 8,4,5,9,12,14,14,13,15,3,10, and these 11 not the compressed audio particle can embed above-mentioned 8 bit secret informations.Below in conjunction with treating that the hidden scale-of-two secret information bit stream of writing describes the process of utilizing index value to embed secret information in detail.First treats that the hidden secret information bit of writing is " 0 ", and the initial value of zone bit flag is 0, and by embedding regulation as can be known, the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, this moment, the value of index value was 8, met the demands, and embedding is completed; Flag is 0, the second and treats the hidden secret information bit of writing for " 1 ", and the value of index value needs choose in the second index value subset { 4,5,6,7,11,12,13 }, and this moment, the value of index value was 4, met the demands, and embedding is completed; Flag is 0, the three and treats the hidden secret information bit of writing for " 0 ", and the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, and the value of index value is 5 at this moment, not in the first index value subset, therefore need to select the value that value is replaced original index value, the value of index value from the first index value subset is 8 to be that first satisfies condition, so the value of index value is replaced to 8 rear embedding operations by 5 completes; Flag is 0, the four and treats the hidden secret information bit of writing for " 1 ", and the value of index value needs in the second index value subset { 4,5,6,7,11,12,13 } choose in, and the value of index value is 9 at this moment, not in the second index value subset, therefore need to select the value that value is replaced original index value, the value of index value from the second index value subset is 11 to be that first satisfies condition, so the value of index value is replaced to 11 rear embedding operations by 9 completes; Flag is 0, the five and treats the hidden secret information bit of writing for " 0 ", and the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, and the value of index value is 12 at this moment, not in the first index value subset, and for the first special circumstances (index value be 4 11 or 12 or 13 and treat that the hidden secret information bit of writing is for " 0 "), therefore directly index value is set to 15, preserve the current hidden secret information bit of writing for the treatment of, simultaneously flag is set to 1; Treat that because flag is 1, the six the hidden secret information bit of writing treats the hidden secret information bit " 0 " of writing for the 5th of preserving, the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, and the value of index value is 14 at this moment, meets the demands, flag is set to 0, and embedding is completed; Flag is 0, the seven and treats the hidden secret information bit of writing for " 1 ", and the value of index value needs in the second index value subset { 4,5,6,7,11,12,13 } choose in, and the value of index value is 14 at this moment, not in the second index value subset, and for the second special circumstances (index value is 14 and treats that the hidden secret information bit of writing is " 1 "), therefore directly index value is set to 15, preserve the current hidden secret information bit of writing for the treatment of, simultaneously flag is set to 1; Treat that because flag is 1, the eight the hidden secret information bit of writing treats the hidden secret information bit " 1 " of writing for the 7th of preserving, the value of index value needs in the second index value subset { 4,5,6,7,11,12,13 } choose in, this moment, the value of index value was 13, met the demands, flag is set to 0, and embedding is completed; Flag is 0, the nine and treats the hidden secret information bit of writing for " 0 ", and the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, this moment, the value of index value was 15, was the third special circumstances (index value is 15), preserve the current hidden secret information bit of writing for the treatment of, flag is set to 1; Flag is 1, the ten and treats that the hidden secret information bit of writing treats the hidden secret information bit " 0 " of writing for the 9th of preserving, and the value of index value needs in the first index value subset { 0,1,2,3,8,9,10,14,15 } choose in, this moment, the value of index value was 3, met the demands, flag is set to 0, and embedding is completed; Flag is 0, the ten one and treats that the hidden secret information bit of writing is " 0 ", and the value of index value needs choose in the first index value subset { 0,1,2,3,8,9,10,14,15 }, and this moment, the value of index value was 10, met the demands, and embedding is completed.So far, the compressed domain audio particle is not complete with the 8 whole embeddings of bit information to be embedded with 11, simultaneously 11 not the index value of compressed domain audio particle be revised as 8,4,8,11,15,14,15,13,15,3,10 by 8,4,5,9,12,14,14,13,15,3,10, above-described telescopiny is as shown in Figure 3.
Embodiment two:
The present embodiment has proposed a kind of compressed domain audio digital extraction method based on index value simultaneously for a kind of compressed domain audio steganography method based on index value that embodiment one proposes, its FB(flow block) as shown in Figure 4, it specifically comprises the following steps:
1) the digital extraction termination is received the compressed audio that contains secret information that the steganography end sends.
2) at the digital extraction end, to the compressed audio that the contains secret information processing of decoding, take out a pending audio frequency particle take the audio frequency particle as unit from the compressed audio that contains secret information, and will this pending audio frequency particle as current audio frequency particle.
3) current audio frequency particle is decoded, then extract index value corresponding to current audio frequency particle from the side information that decoding obtains.
4) according to index value corresponding to current audio frequency particle, determine whether and to carry out the extraction of secret information bit to current audio frequency particle, after determining to carry out the extraction of secret information bit to current audio frequency particle, determine the concrete bit value of the secret information bit that extracts.
In this specific embodiment, the detailed process of step 4) is:
4)-1, judge whether index value corresponding to current audio frequency particle is 15, if, determining does not need current audio frequency particle is carried out the extraction of secret information bit, then execution in step 5), otherwise, determine and need to carry out the extraction of secret information bit to current audio frequency particle, then execution in step 4)-2.
4) if-2 index values corresponding to current audio frequency particle belong to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extract the secret information bit from current audio frequency particle, and be bit " 0 ", then execution in step 5); If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, extract the secret information bit from current audio frequency particle, and be bit " 1 ", then execution in step 5).
5) take out next pending audio frequency particle as current audio frequency particle from the compressed audio that contains secret information, then returning to step 3) continues to carry out, until all audio frequency particle disposal that contain in the compressed audio of secret information are complete, obtain containing the hidden scale-of-two secret information bit stream of writing in the compressed audio of secret information.
At this, the compressed audio that contains secret information in embodiment one is decoded, obtain the index value sequence in side information, be " 8,4,8,11,15,14,15,13,15,3,10 ".According to step 4), can extract at an easy rate the secret information bit of embedding, namely index value is 8 o'clock, belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extracts secret information bit " 0 "; Index value is 4 o'clock, belongs to the second index value subset { 4,5,6,7,11,12,13 }, extracts secret information bit " 1 "; Index value is 8 o'clock, belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extracts secret information bit " 0 "; Index value is 11 o'clock, belongs to the second index value subset { 4,5,6,7,11,12,13 }, extracts secret information bit " 1 "; Index value is 15 to advance, and skips not information extraction; Index value is 14 o'clock, belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extracts secret information bit " 0 "; Index value is 15 o'clock, skips not information extraction; Index value is 13 o'clock, belongs to the second index value subset { 4,5,6,7,11,12,13 }, extracts secret information bit " 1 "; Index value is 15 o'clock, skips not information extraction; Index value is 3 o'clock, belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extracts secret information bit " 0 "; Index value is 10 o'clock, belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extracts secret information bit " 0 "; So far, the correct extraction of scale-of-two secret information bit stream is complete, is " 01010100 ", and detailed process as shown in Figure 5.
Claims (4)
1. compressed domain audio steganography method based on index value is characterized in that specifically comprising the following steps:
1. at the steganography end, pending not compressed audio as current not compressed audio, and is givenly treated the hidden scale-of-two secret information bit stream of writing;
2. in the compressed domain audio cataloged procedure, take the audio frequency particle as unit, current not compressed audio is carried out encoding compression processing, take out a pending audio frequency particle from current not compressed audio, and will this pending audio frequency particle as current audio frequency particle;
3. utilize bank of filters to carry out filtering to current audio frequency particle and process, obtain the audio frequency particle after filtering is processed; And utilize psychoacoustic model that current audio frequency particle is processed, and the type of the window that the audio frequency particle after obtaining filtering is processed need adopt when carrying out windowing process, the letter that reaches each scale factor band corresponding to current audio frequency particle is covered ratio;
The type of the window that need adopt during 4. according to the audio frequency particle windowing process after the filtering processing, the audio frequency particle after filtering is processed carries out Modified Discrete Cosine Transform to be processed, and obtains Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle;
5. take out from treat the hidden scale-of-two secret information bit stream of writing and treat the hidden secret information bit of writing, then according to the index value of the scale factor for the treatment of the hidden secret information bit of writing and Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle, determine whether to embed in current audio frequency particle and treat the hidden secret information bit of writing, and determine whether to revise the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient that when obtaining encoding, current audio frequency particle is corresponding;
6. the letter of each the scale factor band corresponding according to current audio frequency particle cover than with the index value of the scale factor of Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle of when coding, Modified Discrete Cosine Transform coefficient corresponding to current audio frequency particle quantized to encode with entropy;
7. take out next pending audio frequency particle as current audio frequency particle from current not compressed audio, then return to step and 3. continue to carry out, until all the audio frequency particle disposal in current not compressed audio are complete, obtain containing the compressed audio of secret information;
8. the steganography end sends and contains the compressed audio of secret information to the digital extraction end.
2. a kind of compressed domain audio steganography method based on index value according to claim 1 is characterized in that described step detailed process 5. is:
5.-1, judgement is used for whether the value whether expression repeat to embed the zone bit flag of secret information bit is 0, if, take out a new secret information bit and treat the hidden secret information bit of writing as current from treat the hidden scale-of-two secret information bit stream of writing, otherwise, take out the secret information bit of preserving in last secret information bit telescopiny, treat the hidden secret information bit of writing as current, wherein, the initial value of flag is 0;
5.-2, the index value of the scale factor of the Modified Discrete Cosine Transform coefficient corresponding according to current audio frequency particle, need in current audio frequency particle to determine the secret information bit of embedding, detailed process is: if index value corresponding to current audio frequency particle belongs to the first index value subset { 0,1,2,3,8,9,10,14,15 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 0 "; If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, determine that the secret information bit that needs in current audio frequency particle to embed is bit " 1 ";
5.-3, judge that whether index value corresponding to current audio frequency particle be 14 and currently treat whether the hidden secret information bit of writing is bit " 1 ", if the index value that current audio frequency particle is corresponding is 14 and currently treats that the hidden secret information bit of writing is bit " 1 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-4;
5.-4, judge that whether index value corresponding to current audio frequency particle is 15, if so, does not embed the secret information bit in current audio frequency particle, then preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, then execution in step 6., otherwise, execution in step 5.-5;
5.-5, judge that whether index value corresponding to current audio frequency particle be 4 or 11 or 12 or 13 and currently treat whether the hidden secret information bit of writing is bit " 0 ", if the index value that current audio frequency particle is corresponding is 4 or 11 or 12 or 13 and currently treat that the hidden secret information bit of writing is bit " 0 ", do not embed the secret information bit in current audio frequency particle, then index value corresponding to current audio frequency particle is revised as 15, and preserve the current hidden secret information bit of writing for the treatment of, the value of putting simultaneously flag is 1, execution in step 6. again, otherwise, execution in step 5.-6;
5. the secret information bit that-6, judges need embedding in current audio frequency particle treats with current whether the hidden secret information bit of writing is consistent, if consistent, index value corresponding to current audio frequency particle do not modified, realization embeds the current hidden secret information bit of writing for the treatment of in current audio frequency particle, then execution in step 6., otherwise, execution in step 5.-7;
If 5.-7 currently treat that the hidden secret information bit of writing is bit " 0 ", index value corresponding to current audio frequency particle is revised as the first index value subset { 0,1,2,3,8,9,10,14,15 } index value of first satisfied replacement condition in is realized embedding the current hidden secret information bit of writing for the treatment of in current audio frequency particle, and then execution in step 6.; If currently treat that the hidden secret information bit of writing is bit " 1 ", index value corresponding to current audio frequency particle is revised as the second index value subset { 4,5,6,7,11,12,13 } index value of first satisfied replacement condition in is realized embedding the current hidden secret information bit of writing for the treatment of in current audio frequency particle, and then execution in step 6.; At this, the replacement condition is: the required bit number of scale factor of two groups of scale factor bands of the current audio frequency particle of coding that the index value after replacement is indicated is not less than the required bit number of scale factor of two groups of scale factor bands replacing the indicated current audio frequency particle of coding of front index value.
3. compressed domain audio digital extraction method based on index value is characterized in that specifically comprising the following steps:
1) the digital extraction termination is received the compressed audio that contains secret information that the steganography end sends;
2) at the digital extraction end, to the compressed audio that the contains secret information processing of decoding, take out a pending audio frequency particle take the audio frequency particle as unit from the compressed audio that contains secret information, and will this pending audio frequency particle as current audio frequency particle;
3) current audio frequency particle is decoded, then extract index value corresponding to current audio frequency particle from the side information that decoding obtains;
4) according to index value corresponding to current audio frequency particle, determine whether and to carry out the extraction of secret information bit to current audio frequency particle, after determining to carry out the extraction of secret information bit to current audio frequency particle, determine the concrete bit value of the secret information bit that extracts;
5) take out next pending audio frequency particle as current audio frequency particle from the compressed audio that contains secret information, then returning to step 3) continues to carry out, until all audio frequency particle disposal that contain in the compressed audio of secret information are complete, obtain containing the hidden scale-of-two secret information bit stream of writing in the compressed audio of secret information.
4. a kind of compressed domain audio digital extraction method based on index value according to claim 3 is characterized in that the detailed process of described step 4) is:
4)-1, judge whether index value corresponding to current audio frequency particle is 15, if, determining does not need current audio frequency particle is carried out the extraction of secret information bit, then execution in step 5), otherwise, determine and need to carry out the extraction of secret information bit to current audio frequency particle, then execution in step 4)-2;
4) if-2 index values corresponding to current audio frequency particle belong to the first index value subset { 0,1,2,3,8,9,10,14,15 }, extract the secret information bit from current audio frequency particle, and be bit " 0 ", then execution in step 5); If index value corresponding to current audio frequency particle belongs to the second index value subset { 4,5,6,7,11,12,13 }, extract the secret information bit from current audio frequency particle, and be bit " 1 ", then execution in step 5).
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