Pkcrack 64 bit windows
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Free Trial, Nothing to install. No interruption of visitors. True story: We found on one of our backup CDs an old password protected zip archive, containing several important documents. Since the password for this file were long forgotten, we used elcomSoft's excellent recovery tool azpr to brute force the password for up to 7 characters. After seeing we were facing 50 days of brute forcing, we decided to give known-plaintext attack a shot. Ingredients: To decrypt a password protected. Recipe: PKZip allows us to list the file's contents even if it is password protected so we can look at this example file: Stuff 1 WinZip file: Documents. You will need to know the MS-Word version number, but you can guess that as well from the date of the document or simply try all the possibilities. Note on PKZip version: You don't need to have the exact same version as the one used to encrypt the file. Our original file was from 2001 and the WinZip version we used was the latest 8. Now on to Work: Use extract. The -p option tells extract to ignore file path, and simply look for the name. If you have more than one file with the same name, use full path. Now let's prep the plaintext: Create a new zip archive: DocumentsP. Before compressing, choose compression method in WinZip fast, normal, Maximum etc. WinZip will prompt you for password, give it a dummy or an empty one, and look at the window opened, near each file listed you should be able too see for WinZip created archive only the compression method used. Now run extract for the plaintext: extract DocumentsP. Found 4194304 possible key2-values. Now we're trying to reduce these... Lowest number: 991 values at offset 108676 Lowest number: 951 values at offset 108661 Lowest number: 927 values at offset 108649 Lowest number: 907 values at offset 108641 Lowest number: 902 values at offset 108636 Lowest number: 851 values at offset 108635 Lowest number: 803 values at offset 108634 Lowest number: 757 values at offset 108630 Lowest number: 700 values at offset 108208 Lowest number: 676 values at offset 108207 Lowest number: 667 values at offset 108206 Lowest number: 615 values at offset 108200 Lowest number: 597 values at offset 108183 Lowest number: 595 values at offset 108182 Lowest number: 588 values at offset 108180 Lowest number: 563 values at offset 108179 Lowest number: 528 values at offset 108178 Lowest number: 502 values at offset 108177 Lowest number: 497 values at offset 108176 Lowest number: 492 values at offset 108175 Lowest number: 487 values at offset 108159 Lowest number: 484 values at offset 108158 Lowest number: 467 values at offset 108154 Lowest number: 460 values at offset 108152 Lowest number: 447 values at offset 94308 Lowest number: 417 values at offset 94306 Lowest number: 406 values at offset 94304 Lowest number: 381 values at offset 94291 Lowest number: 370 values at offset 94290 Lowest number: 349 values at offset 94284 Lowest number: 344 values at offset 94267 Lowest number: 328 values at offset 64108 Lowest number: 318 values at offset 64107 Lowest number: 313 values at offset 64097 Lowest number: 303 values at offset 64095 Lowest number: 282 values at offset 64094 Lowest number: 271 values at offset 64093 Lowest number: 269 values at offset 64091 Lowest number: 260 values at offset 64090 Lowest number: 257 values at offset 64087 Lowest number: 247 values at offset 64086 Lowest number: 244 values at offset 64085 Lowest number: 233 values at offset 64083 Lowest number: 225 values at offset 64046 Lowest number: 218 values at offset 64045 Lowest number: 193 values at offset 64043 Lowest number: 169 values at offset 64042 Lowest number: 167 values at offset 64023 Lowest number: 152 values at offset 64022 Lowest number: 143 values at offset 64021 Lowest number: 138 values at offset 64019 Lowest number: 129 values at offset 64016 Lowest number: 114 values at offset 18707 Lowest number: 107 values at offset 18706 Lowest number: 98 values at offset 18705 Done. Left with 98 possible Values. Starting stage 2 on Thu Apr 10 11:26:58 2003 Ta-daaaaa! Starting password search on Thu Apr 10 11:27:16 2003 Key: 64 6f 63 75 6d 65 6e 74 73 32 Or as a string: 'documents2' without the enclosing single quotes Key: 64 6f 63 75 6d 65 6e 74 73 32 Or as a string: 'documents2' without the enclosing single quotes Finished on Thu Apr 10 11:31:33 2003 Ta-daaaa indeed, 8 minutes later and a couple of CPU years, we cracked a 10 characters length password! The test ran on P4 1. Epilogue: Keep in mind that the smaller the plaintext, the slower the run. Also remember that before attempting to crack the password, pkcrack outputs the 3 key set used by PKZip. These keys can be used to decrypt the file without having the actual password. The tool 'decrypt' in the pkcrack toolkit does just that. Pkcrack is an excellent tool, with far more options than shown here. For more details, RTFM.
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