CN102983967A - Quick traversal algorithm and device for complicated password - Google Patents
Quick traversal algorithm and device for complicated password Download PDFInfo
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Abstract
The invention provides a quick traversal algorithm and a device for a complicated password. The quick traversal algorithm comprises the following steps: segmenting the to-be-deciphered password, and using deciphering factors or specific character strings with the same type of character set for each segment, wherein according to the analysis, the password formed by the former way is more than 95% of the actual password, so that the password traversal space can be greatly reduced; and by virtue of the algorithm, under the same device and the same time, the password with longer length and more complicated character set can be resolved. At the same time, the algorithm brings in the fixed words as a complete unit to perform traversal, which effectively utilizes the known password information and improves the resolution efficiency exponentially.
Description
Technical field
The present invention relates to password encryption and decryption field, refer in particular to the quick ergodic algorithm of a kind of complicated password and device.Background technology
Violence password traversal is a kind of effective means that Current Password recovers, in some cases or even unique means.But the method for violence traversal is subject to the impact of two factors of computational speed and password space, and is long for length, comprise the more complicated password of character types, and the violence traversal is calculated even needed the time in hundreds and thousands of years, makes it lose meaning.How to parse complicated as far as possible password within the effective time is current main direction of studying.At present, research mainly concentrates on the speed that improves the violence traversal by various hardware-accelerated, algorithm optimizations, distributed computing technology, shortens the time of traversal with this.But by the method that improves computational speed traversal time linearity is reduced, and Password Length increases, the code characters collection increases the successful time geometry progression of traversal be increased.
A kind of typical algorithm of existing cipher decoding is to adopt traditional password ergodic algorithm, this ergodic algorithm adopts the mode of pure permutation and combination, comprise in the specific length all travel through to all passwords of character, but because ergodic process is not considered the feature of password, cause this algorithm need to travel through quite a lot of character string that can not be used as password or seldom be used as password, whole efficiency is lower.Along with the raising of password use character set complexity, traditional rule will face the problem of password Space Explosion.
Particularly, in some cases, some words that comprise in may known password, and traditional password ergodic algorithm can't effectively use these known information, still can only carry out permutation and combination to all possible character, efficient is very low.
Summary of the invention
The object of the invention is to overcome defects, a kind of quick ergodic algorithm of complicated password and device based on the segmentation of the deciphering factor is provided.
The object of the present invention is achieved like this: the quick ergodic algorithm of a kind of complicated password, and it comprises step,
A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set;
B), traversal from treat traversal set, take out a segmented mode, a segmentation is brought into the deciphering factor at every turn and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
In the above-mentioned steps, the described deciphering factor is character set, and the type of character is identical in the character set; Described steps A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of character set at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set; Described step B), traversal takes out a segmented mode from treat traversal set, the character of respectively each segmentation traversal being brought into character set in the deciphering factor carries out character transformation and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password;
In the above-mentioned steps, described character set is numeric character set or capitalization character set or lowercase character set or additional character character set or dictionary character set; Comprise the character of arranging by kinds of characters length traversal in described numeric character set, capitalization character set, the lowercase character set;
In the above-mentioned steps, the character set of the deciphering factor in the described steps A reads first all characters by manually input or by algorithm, automatically according to forming after the character types classification.
In the above-mentioned steps, the described deciphering factor is specific character string, and described specific character string produces by setting.
The present invention also provides a kind of complicated password quick ergodic algorithm device, and it comprises,
The cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factors carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered;
Deciphering module is used for a segmentation being brought into the deciphering factor at every turn and attempting deciphering from the described segmented mode of traversal set taking-up for the treatment of, non-decrypting segmentation is recovered original character, until obtain till the password;
In above-mentioned, the described deciphering factor is character set, and the type of character is identical in the character set; Described cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factor character set carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered; Described deciphering module, be used for from the described segmented mode of traversal set taking-up for the treatment of, respectively each segmentation traversal is brought into the character of deciphering character set in the factor and carry out character transformation trial deciphering, non-decrypting segmentation is recovered original character, until obtain till the password;
In above-mentioned, described character set is numeric character set or capitalization character set or lowercase character set or additional character character set or dictionary character set; Comprise the character of arranging by kinds of characters length traversal in described numeric character set, capitalization character set, the lowercase character set;
In above-mentioned, comprise the character set generation unit in the described cipher segment module, described character set generation unit is used for obtaining manually input character and generates character set, and described character set generation unit also is used for obtaining all characters, according to the character types classification and generate character set;
In above-mentioned, the described deciphering factor is specific character string, and described specific character string produces by setting.
Than common decipherment algorithm, beneficial effect of the present invention is and will treats that clear crytpographic key carries out segmentation, each section uses the deciphering factor or the specific character string of same type character set, wherein, adopt the former to account for more than 95% of actual password by the password of combination according to analyzing, therefore can greatly reduce password traversal space, so that after adopting this algorithm, in identical device and the situation of identical time, can resolve the password that length is longer, character set is more complicated.Simultaneously, this algorithm introducing fixedly word travels through as full unit, effectively utilizes known encrypted message, significantly improves analyzing efficiency.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized purpose and effect, also cooperate the detailed explanation of giving below in conjunction with execution mode.
The present invention relates to the quick ergodic algorithm of a kind of complicated password, it comprises step:
A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set;
In this step, need to filter the segmentation compound mode that does not meet Password Length and require according to the password total length of setting, thereby increase efficient.
B), from treat traversal set, take out a segmented mode, a segmentation is brought into the deciphering factor at every turn and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
As seen, cryptographic algorithm provided by the invention improves the conventional cipher ergodic algorithm, and the special password with segmentation feature of resolving namely forms by a few sections in the password, and each section uses the deciphering factor of same type, and such password accounts for more than 95%.Algorithm after the improvement can greatly reduce password traversal space.
Further, the above-mentioned deciphering factor can be character set, comprises the character that same type is combined to form in the character set of a deciphering factor.For example, the deciphering factor can be numeric character set, capitalization character set, lowercase character set, additional character character set or dictionary character set etc., so a plurality of deciphering factors namely more permutation and combination method under the password total length of setting, treat the segmentation that clear crytpographic key carries out correspondence numeral, capitalization, lowercase, additional character character.The algorithm of the further corresponding character set of this algorithm is specially:
A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of character set at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set;
Deciphering factor content is depended in the difference that at least two kinds of deciphering factors in this step refer to, the type difference of namely deciphering the character set of the factor namely belongs to different types of deciphering factor.
B), traversal takes out a segmented mode from treat traversal set, the character of respectively each segmentation traversal being brought into character set in the deciphering factor carries out character transformation and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
Better, decipher from the segmentation of password lowest order herein and begin the conversion character, if all characters of character set all travel through and finish in the deciphering factor of low level segmentation, then hang down the bit recovery original character, a high segmentation begins to travel through character transformation, finishes until all characters of the segmentation of highest order all travel through.
Further, above-mentioned algorithm can be supported manually segmentation and automatic segmentation dual mode, can switch flexibly use.
Wherein, automatic segmentation is that algorithm at first reads in all characters in the specified file, forms corresponding character set after then automatically according to character types it being classified, and then it is imported the rear above-mentioned steps A that carries out in the algorithm.
And manually segmentation then is that good each section character set of classification that will manually formulate imports algorithm, then carries out above-mentioned steps A.
By the inventive method, take password HelloLiuHello88 as example, the capital and small letter that adopts the conventional cipher ergodic algorithm need to travel through 15 adds the character set of numeral, and its password space is 62
15=768909704948766668552634368 passwords are even with the simple cryptographic algorithm of present equipment performance, also need to spend the parsing time in more than one hundred million years.Adopt segmented cipher ergodic algorithm of the present invention, its password space only is 757193143529996160 passwords, is the 9.85e-10 in traditional algorithm password space, and the parsing time can shorten to several days, makes the parsing of this complicated password become possibility.
In addition, the inventive method also can be finished deciphering further combined with specific character string, specific character string herein refers to before deciphering, and artificial setting recording is arranged.Because some deciphering situation, may exist before deciphering with regard to some the fixing word in the known password, then by with these fixedly word import algorithm and will certainly greatly reduce decrypting process.Concrete grammar is that specific character string is imported in the algorithm as a deciphering factor, carries out segmentation according to its character length in conjunction with other deciphering factor pair passwords equally, then finishes deciphering.
As required, above-mentioned specific character string also can be used as in decrypting process in the character set of the deciphering factor that a special character adds any section.For example, a password that is formed by 3 bit digital, 3 small letters and specific character string " Hello ", specific character string replaces joining with additional character ' * ' in every section the character set during deciphering, and then traversal rule is as follows:
000aaa-〉100aaa-〉200aaa-〉...-〉 900aaa-〉* 00aaa-〉010aaa-〉110aaa-〉...-〉 * 10aaa-＞...-〉 * * * aaa-〉000baa-〉...-〉 * * * zaa-〉000*aa-〉... * * * * * * end;
As seen, this algorithm travels through as full unit by introducing specific character string, effectively utilizes known encrypted message, significantly improves analyzing efficiency.
Specific embodiment:
Take 6 password xxxxxx of needs deciphering as example, actual password is 123abc, namely is comprised of letter and number, has been equipped with two character set of lowercase character collection and numeric character set, and the password total length of setting is 6, and decryption step is as follows:
A), with permutation and combination method the password total length of setting is divided into two sections with xxxxxx according to the character length to lowercase character collection and two kinds of deciphering of numeric character set factor, one section is lowercase, one section is numeral, automatically the traversal figure place with the small letter parent segment is decided to be the 1-5 position, and the traversal figure place of digital section is decided to be the 1-5 position; Then obtain treating traversal set according to segmented mode, figure place permutation and combination, comprise 10 kinds of permutation and combination methods such as 1 letter+5 bit digital, 1 bit digital+5 letter, 2 letter+4 bit digital, 2 bit digital+4 letter.
B), get a kind of not compound mode of traversal in the traversal set, such as 1 letter+5 bit digital, construct a00000, b00000 according to traversal rule ... the passwords such as z99999, and with password attempt deciphering, proving correctness.If all incorrect, take off one group of compound mode that does not travel through, construct all passwords of next group and attempt deciphering.Until when traveling through the combination of 3 bit digital+3 letter, this composite construction goes out the 123abc password, finish traversal behind the successful decryption.
The invention still further relates to the quick ergodic algorithm device of a kind of complicated password, it comprises,
The cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factors carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered;
Deciphering module is used for a segmentation being brought into the deciphering factor at every turn and attempting deciphering from the described segmented mode of traversal set taking-up for the treatment of, non-decrypting segmentation is recovered original character, until obtain till the password.
In like manner, the above-mentioned deciphering factor may further be character set, and the type of character is identical in the character set.As embodiment, character set can be numeric character set or capitalization character set or lowercase character set or additional character character set or dictionary character set; Comprise the character of arranging by kinds of characters length traversal in described numeric character set, capitalization character set, the lowercase character set.
The corresponding deciphering factor is the character set situation, and calculation device further is:
The cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factor character set carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered;
Deciphering module is used for treating that from described the traversal set takes out a segmented mode, and the character of respectively each segmentation traversal being brought into character set in the deciphering factor carries out character transformation and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
Comprise the character set generation unit in the described cipher segment module, described character set generation unit is used for obtaining manually input character and generates character set, and described character set generation unit also is used for obtaining all characters, according to the character types classification and generate character set.
The described deciphering factor is specific character string, and described specific character string produces by setting.
To sum up, the present invention program can comprise for some phrase, the password that comprises in the known password situation of complex characters collection, the effect that reduces the password space is more obvious, can make the password space reduce several orders of magnitude even tens orders of magnitude, more more complicated longer passwords can successfully be recovered.So that in identical device and the situation of identical time, can resolve length is longer, character set the is more complicated password possibility that becomes.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes description of the present invention to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. quick ergodic algorithm of complicated password, it is characterized in that: it comprises step,
A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set;
B), traversal from treat traversal set, take out a segmented mode, a segmentation is brought into the deciphering factor at every turn and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
2. the quick ergodic algorithm of complicated password as claimed in claim 1, it is characterized in that: the described deciphering factor is character set, and the type of character is identical in the character set;
Described steps A), with permutation and combination method the password total length of setting is carried out segmentation according to the character lengths of character set at least two kinds of deciphering factors, obtain above-mentioned all permutation and combination segmented mode treat the traversal set;
Described step B), traversal takes out a segmented mode from treat traversal set, the character of respectively each segmentation traversal being brought into character set in the deciphering factor carries out character transformation and attempts deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
3. the quick ergodic algorithm of complicated password as claimed in claim 2, it is characterized in that: described character set is numeric character set or capitalization character set or lowercase character set or additional character character set or dictionary character set; Comprise the character of arranging by kinds of characters length traversal in described numeric character set, capitalization character set, the lowercase character set.
4. the quick ergodic algorithm of complicated password as claimed in claim 2 is characterized in that: the character set of the deciphering factor in the described steps A reads first all characters by manually input or by algorithm, automatically according to forming after the character types classification.
5. such as the quick ergodic algorithm of the described complicated password of claim 1-4 any one, it is characterized in that: the described deciphering factor is specific character string, and described specific character string produces by setting.
6. quick ergodic algorithm device of complicated password is characterized in that: it comprises,
The cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factors carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered;
Deciphering module is used for a segmentation being brought into the deciphering factor at every turn and attempting deciphering from the described segmented mode of traversal set taking-up for the treatment of, non-decrypting segmentation is recovered original character, until obtain till the password.
7. the quick ergodic algorithm device of complicated password as claimed in claim 6, it is characterized in that: the described deciphering factor is character set, and the type of character is identical in the character set;
Described cipher segment module, the character lengths that are used at least two kinds of deciphering of basis factor character set carry out segmentation with permutation and combination method to the password total length of setting, and the traversal for the treatment of that generates the segmented mode of above-mentioned all permutation and combination is gathered;
Described deciphering module, be used for from the described segmented mode of traversal set taking-up for the treatment of, respectively each segmentation traversal is brought into the character of deciphering character set in the factor and carry out character transformation trial deciphering, non-decrypting segmentation is recovered original character, until obtain till the password.
8. the quick ergodic algorithm device of complicated password as claimed in claim 7, it is characterized in that: described character set is numeric character set or capitalization character set or lowercase character set or additional character character set or dictionary character set; Comprise the character of arranging by kinds of characters length traversal in described numeric character set, capitalization character set, the lowercase character set.
9. the quick ergodic algorithm device of complicated password as claimed in claim 7, it is characterized in that: comprise the character set generation unit in the described cipher segment module, described character set generation unit is used for obtaining manually input character and generates character set, described character set generation unit also is used for obtaining all characters, according to character types classification and generation character set.
10. such as the quick ergodic algorithm device of the described complicated password of claim 6-9 any one, it is characterized in that: the described deciphering factor is specific character string, and described specific character string produces by setting.
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