The files do not complement each other – the last loaded file overwrites the previous ones. The file can also be in the current working directory or in all places at once. If you installed from the standard repository of your distribution, then this file is located in the /etc/john/nf folder and is also duplicated in /usr/share/john/nf. If you installed John the Ripper from source, then this file is located in the same folder as the john executable. A long article on John's configuration and remaining options is on its way, for now I'll just point out that the Linux configuration file is named nf. All rules must be specified in the configuration file. John the Ripper also has the -rules option and instinctively you can try to substitute a file with rules in there, but it won't work. If you have already mastered Hashcat rule-based attack, then you need to create files with rules there and specify them using options. There is also a rule-based attack in Hashcat (an article will be written on this topic!). It's a powerful (and fundamentally not that complicated) engine that you might find useful in some unusual situations.Įxamples of Rule-Based Attacks in John the Ripper That is, the rules allow you to change, create new passwords, and also reject password candidates according to certain numerous criteria. Removal of words that do not meet the specified criteria (presence or absence of characters or character sets repeating a character or character set a certain number of times, insufficient or excessive length, etc.) Repeat, delete, or overwrite any characters Switch the whole word to upper or lower caseĭoubling and any number of repetitions of a word What is John the Ripper Rule-Based AttackĪ rule-based attack is a high-level modification of dictionaries, when they are created and modified not only by adding new symbols, but also with operations inaccessible with masks, such as:Ĭhanging the case of all or individual letters both in the indicated positions and in any places 6. How to brute force non-standard hashes
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