tailieunhanh - HACK PROOFING YOUR NETWORK INTERNET TRADECRAFT phần 5

tặc hack kỹ năng trung bình hoặc tốt hơn cho lợi ích của hacking. Họ sẽ không bao giờ sử dụng kỹ năng của họ để gây ra thiệt hại, và họ công bố thông tin mà họ tìm thấy. Chúng tôi may mắn nhất của những tin tặc đã chọn để gây ra | 166 Chapter 6 Cryptography L0phtCrack is commercial software however a 15-day trial can be obtained at l0phtcrack Crack Alec Muffett is the author of Crack a password-guessing program his words for UNIX systems. It runs only on UNIX systems and is for the most part a dictionary-based program. However in the latest release available from 1996 Alec has bundled Crack7. Crack7 is a brute force password cracker that can be used if your dictionary-based attack fails. One of the most interesting aspects of this combination is that Crack can test for common variants that people use who think they are picking more secure passwords. For example instead of password someone may choose pa55word. Crack has permutation rules which are user configurable that will catch this. More information on Alec Muffett and Crack is available at crypto John the Ripper John the Ripper is also primarily a UNIX password-cracking program but it differs from Crack because it can be run on not only UNIX systems but also DOS and Windows NT 9x. I stated that John the Ripper is used primarily for UNIX passwords but it does have an option to break Windows NT LM LanMan hashes. I cannot verify how well it does on LM hashes because I have never used it for them as I prefer to use L0phtCrack for those. John the Ripper supports brute force attacks but it calls it incremental mode. The parameters character sets in the 16-bit DOS version for incremental mode are configured in under the Incremental MODE stanza. MODE is replaced with a word you want to use and it is also passed on the command line when starting John the Ripper. The default settings in for brute force are shown in the following example Incremental modes Incremental All File MinLen 0 MaxLen 8 CharCount 95 Incremental Alpha File MinLen 1 MaxLen 8 CharCount 26 Incremental Digits Cryptography Chapter 6 167 File MinLen 1 MaxLen 8 CharCount 10 .

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