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How to Perform a High Performance Password Recovery with iSumsoft Software

This article describes how to perform a high performance password recovery for office, RAR, ZIP and PDF document.

On the old version of the office (97~2003), zip and PDF document, we can use the software leaks to unlock a password protected document in a few minutes, however this is impossible to happen on the new version of these documents if the password is strong. To recover the lost password for the files created by new version of Office, RAR, ZIP and PDF, we need several hours or more time. The tips in this articles can help you shorten password recovery time, so I recommend you spend enough time to read it and set more details to shorten password recovery time.

The more information about the password you know, the better setting you can perform, and the higher performance you can get on the process of password recovery. The details are showing as follows:

9 Tips to Perform a High Performance Password Recovery

1. You know the password length

Example: If you know the password length is 6, you can set both the Minimal password length and Maximal password length to 6.

If you know the password length between 6 and 8, set the Minimal password length to 6, and set the Maximal password length to 8.

If you don't know the password length, i suggest you set the minimal length to 1, and the maximal length to 20.

2. You know the password consist of numbers

If you know the password consist of number only, please check All digits(0-9) option only.

3. You know the password may consist of lower case letter (a to z )

If you know the password consist of low case letter only, please check All small Latin(a-z) option only.

4. You know the password may consist of lower case letter (a to z ) and number.

You can check All small Latin(a-z) option and All digits(0-9) option if you know the password consist of small letter and number only.

5. You know what characters the password consist of, but do not know the right order.

If you know the password may be consist of which characters, you can use and set the User-defined option specify what characters are use to recover password.

Example 1: If you know you password consist of "ABCabc" and numbers 0123, you can check the User-defined option, and set the value as "ABCabc0123". Use User-defined option, but not use All caps Latin(A-Z) and All digits(0-9), any password consist of the character set "ABCabc0123" will be checked whether is the right password. Such as abc123, ABC123, Aa123 and abcABC123 will be checked. But any password contain character which is not in character set "ABCabc0123" will excluded. Such as ABCD2015, abc1234, ABC1234, abcd1234 will be excluded directly.

user-defined

Example 2: The password may consist of your name ("Mike or mike") and number, then you can checked User-defined option, and set the value as "mMike123456789", so mike123456, Mike123456, mike123, Mike123, 123mike, 123MIKE, mike123456789 and Mike123456789 will be checked whether is the right password.

user-defined

Example 3: If you are sure the password consist of "Mike" + number, "mike" + number, or "MIKE" + number, you can perform three times password recovery. You have to run three times, and change Start from setting every time, but these operation definitely shorten your password recovery time compare to example 2.

1. Brute-fore +Minimal length:1 + Maximal length: 9 + Start from: mike + All Digits(0 - 9), see Image-03.

start-mike

2. Brute-fore +Minimal length:1 + Maximal length: 9 + Start from: Mike + All Digits(0 - 9), see Image-04.

start-Mike

3. Brute-fore +Minimal length:1 + Maximal length: 9 + Start from: MIKE + All Digits(0 - 9), see Image-05.

start-MIKE

 

Note: If the password contain a character, but you uncheck the character set which contains that character, the software will fail to find the right password.

6. You know the begin part or end part of the password

If you know some characters of the password, You can use the following setting.

Example 1: You know the prefix characters are "David", you can set the value of Start from option to David.

Example 2: You know the postfix of the password is "9999", you can set the value of the End at option to 9999.

Example 3: You know more about the password: password length is 9, and the password start from David, and the other characters are numbers. You can set the password minimal and maximal length to 4 (9-5=4, 5 is the length of David), set the password start from David, and check All digits(0-9) only. See image-01. Or you can set the Mask option to David????, and check All digits(0-9) only. See image-02. A '?' indicates an unknown character. If the '?' is a character of the password, use '*' replace it, so the Mask option can be set to David**** too. More about mask option, see Use Dictionary and Mask to Recover Password for Office/RAR/ZIP/PDF Document.

 

7. You know some characters of the password.

If you know the password length and and some characters of the password, I recommend you use Mask setting.

Example 1: You know password length is 9, and the prefix is "David", you can set the value of Mask option to "David????". A '?' indicates an unknown character. If the '?' is a character of the password, use '*' replace it, so the Mask option can be set to David**** too. And I recommend you checked All caps latin(A-Z), All small latin(a - z), all digits(0-9), and all special symbols(1@#...).

Example 2: You know password length is 5, the second character is "A", and the last character is "B", you can set the value of of Mask option to "?A??B". And I recommend you checked All caps latin(A-Z), All small latin(a - z), all digits(0-9), and all special symbols(1@#...).

mask

8. You have many passwords, but don't know which one is right.

If the password may be one of the strings in your mind, but you don't know which one is right. In this case, you don't need to try the password one by one, you just save those string to a text file to create a dictionary, and the use the software to perform a dictionary attack to recover the password. Learn more about dictionary attack, see Use Dictionary and Mask to Recover Password for Office/RAR/ZIP/PDF Document.

9. Suggestions for password recovery.

1. I suggest you do more settings to recover the lost password according to the information of the password in your mind. The password length and the password range setting are very important options. If you have these information about the password, please must do these settings.

2. If you have no idea about the password, I recommend you set type of attack to Smart.

3. You can try different settings to recover the lost password, I recommend you try All small latin(a - z) first, then try other character sets. I don't suggest you try All printable character set or All caps latin(A-Z), All small latin(a - z), all digits(0-9), and all special symbols(1@#...) first.

4. If you have two or more computers, you can use all of them to recover the lost. See how to use multiple computers to recover lost password with iSumsoft software.