Using the Random DictionaryĬlicking the edit random button to the bottom right of the available dictionary list will open a dialog that allows you to choose a minimum and maximum password length as well as the character available for each particular character. More information and examples are given in the OSForensics Help file in the "Adding Dictionaries" section. OSForesnics to refresh this list after adding a new entry.Ī dictionary file is simply a text file containing a list of words, one word per The image above, you will need to change to a different tab or section in Once added to this folder your dictionary should appear in the list as seen in In windows Vista/Win7 this is C:\ProgramData\PassMark\OSForensics\PasswordRecovery\PDF. Your OSF dictionaries are stored in the following directory… C:\ProgramData\PassMark\OSForensics\PasswordRecovery\Dictionaries To add a custom dictionary a user simply needs to click on the Add Dictionary button… May be (unintentionally) stored in emails and documents on the system. Many common passwords tend to be family names, pets, anniversary dates etc they These may be very useful and more likely to contain a password than the defaultĭictionaries as the words are sourced from the hard disk under investigation. The image below hasĪ dictionary named "My Index" which is from the current case. Will be added to the list of available dictionaries automatically. The password recovery process, any dictionaries detected for the current case PDF files can use 2 encryption methods, older ones (1.4 andĮncryption, however newer version use larger keys (up to 256bit) and AESĮncryption so only a dictionary attack can be used.įor your case you are able to use the dictionary of words generated as part of Version of ZIP files can use AES encryption so only a dictionary attack can be Their own proprietary algorithm which can be cracked in several hours if certainĬriteria are met (needs to be a minimum number of files in the ZIP file). Process, so only the dictionary based attack is possible. RAR files use AES encryption and methods that slowdown the password testing That can be tested (to approximately 200 a second). Office 2007 introduced a much more secure method of encrypting documents, usingĪES and multiple hashing methods to further slow down the number of passwords (SH1, 128bit RC4 keys and longer password lengths), so some files are able to beĭecrypted using the above method while others will need to use dictionary Office XP and 2003 used a combination of 40bit and newer encryption methods To decrypt the file, and can be completed in (at most) roughly 3 days of This allows a brute force attack to test all possible key values Reduced to 40bits (to comply with US export regulations relating toĬryptography). Microsoft Office documents versions used what is referred to as 40bitĮncryption, using RC4 and MD5 algorithms where the key size was artificially Words and phrases must be used in an attempt to find the correct password (also With stronger encryption methods this is no longer possible, and a dictionary of Possible keys is low, and each key can be tested until the correct one is found. Used is not very strong (such as 40bit encryption below) then the number of In cryptography, a key is a bit stream of set length, eg 40bit,ġ28bit, 256bit (depending on the encryption method used) that is generated fromĪ password, which is an actual word or combination ofĬharacters that is easily remembered by the user. If successful, users will hear a short audio notification as OSForensics displayed the password as shown above.įor more information about password recovery in OSForensics see the sections below Document Encryptionĭistributed Password Recovery Clients (OSForensics Pro Edition Only) Once the files are chosen, select one or more available dictionaries from the list and click ‘Start’. Simply add a password protected file or files to the decryption queue. For other types of encryption, a dictionary is used andĮach word in the dictionary is tested against the file to check if it is the Password, when 40bit encryption is being used each possible key is tested until OSForensics supports file decryption and password recovery of Microsoft Officeĭocuments (doc, docx, docm, xls, xlsx, xlsb, ppt, pps, pptx, pptm, ppsm),ĭepending on the type of encryption used (see the Document Encryption sectionsįor more information) OSForensics uses a different method to search for the » File Decryption
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