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Summary: This is an open source PDF is PDFCrack Pasuwadokurakka I would like to try.
This soft, pretty, well known colors are introduced at various sites.
Here, this is PDFCrack, or about how much you can crack a password, I would like to describe briefly.
Now, PDF is to set a password, PrimoPDF I have conducted.
Try to set a password in conjunction with the description.
PrimoPDF Set the password used to create the PDF.
To download from the above download locations.
After downloading, follow the installation instructions on the screen, let's run.
After the installation, let website suitable to print using PrimoPDF.
After the print run, such as the following PDF File PrimoPDF to save screen appears.
"Change" button and set the password.
These two passwords screen (for writing, for viewing), and sets each.
Pale blue to return to this end with the setting above.
Specify the file name Finally, "PDF creation" to create a file, click the button.
Password in a string of digits, three digits, four digits to four'll create a single file.
PDFCrack Is to analyze the main password.
To download from the above download locations.
Installation is not necessary, you can extract only.
From the command line, the current directory, PDFCrack let's enter the following commands according to the directory where you unzipped the.
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C:\temp>pdfcrack.exe -v
pdfcrack version 0.11
If the version is displayed above is OK.
Let's break the password.
Basically, PDFCrack will try to find a combination of brute force password string.
Patterns have some way of brute force.
Simple brute force in order from one to the characters.
Based on the data dictionary of words to brute force.
A limited number of characters to brute force.
The brute force and brute force used to limit the characters.
Here, the parameter data, such as dictionaries, no, I simply let it rather be analyzed.
First, try to break the two-character password.
First, PrimoPDF, the two-character password to decrypt PDF files let.
How to decrypt the password, you can enter the following command.
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C:\temp>pdfcrack.exe -f pass2.pdf
PDF version 1.4
Security Handler: Standard
V: 2
R: 3
P: -2564
Length: 128
Encrypted Metadata: True
FileID: 4feedfbb8435de68f722ccc6d60b9107
U: e79b6b455afc27a9fca93aeff25d9e3f28bf4e5e4e758a4164004e56fffa0108
O: e4c408de9c8c865ea68537f7cb2740eda64eb6070c64a9c572ac098600992997
found user-password: 'zz'
Here are given "pass2.pdf" is the password you set up two characters is a PDF file.
In a moment like this, the user password (Access (read) password) can parse.
In addition, if you want to analyze the write password can be entered and analyzed as follows.
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C:\temp>pdfcrack.exe -f pass2.pdf -p zz
PDF version 1.4
Security Handler: Standard
V: 2
R: 3
P: -2564
Length: 128
Encrypted Metadata: True
FileID: 4feedfbb8435de68f722ccc6d60b9107
U: e79b6b455afc27a9fca93aeff25d9e3f28bf4e5e4e758a4164004e56fffa0108
O: e4c408de9c8c865ea68537f7cb2740eda64eb6070c64a9c572ac098600992997
found owner-password: 'wa'
found user-password: 'zz'
This is also the moment, the owner password (the Password) can parse.
In this example, the password was analyzed as follows.
Owner password (the Password): 'wa' User password (Access (read) password): 'zz'
The same three letters, let's analyze the four-character password.
Four-character password, it takes a little time.
My PC, it takes about five minutes, could parse.
This time, I think the message that appears in the following command line.
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Average Speed: 18478.2 w/s. Current Word: 'ShHa'
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It has one output per total number of words per second.
In other words, above, is that per second 18,478.2 examined the words.
My PC is from two years ago is the latest specification of the current PC, I might not take so long for.
Also, looking at the text that appears at the end of this output, only letters and numbers only.
In other words, such as non-alphanumeric symbol is not verified.
Password '+ -' just like to set the symbol, this tool can not parse the password.
Given that, it can be calculated as follows.
Analysis of time characters max = 62 ^ password / brute-force number of words per second of ※ ^: exponentiation
Per total number of words of one per second, for clarity, here, instead of 18,478.2, 15000 with the password try to calculate the 5-letter analysis time.
Analysis of time up = 62 ^ 5 / 15000 Therefore And about 61,076 seconds, get the results that about 17 hours.
In other words, my PC, one day, PC if analysis, and always will become available for analysis.
(Strictly, but only alphanumeric characters)
Now, in recent years, recommendations that are 12 characters in length, had been previously recommended and well let's calculate for eight characters.
When the same calculation is as follows.
8 characters: approximately 5,212,500 and the time and is about 595 years.
12 characters: approximately 59,745,680,785,146 and time and is about 6,820,283,194 years.
8 characters, PC is not as well as numbers and not get up and analyze the performance of several multi-unit, 12 characters, and truly, at present, it's like an astronomical number.
Password in this way, sounds like a strong password can include symbols and longer without a word.
(It is that well written.
)
Here are introduced PDFCrack is open source, too, is not that hard to do.
The world, in addition, PDF has full password cracker.
(Pdf crack please try to search.
) Community to confront a victim in the net, well, let's set a password!
!
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