![]() The three primary cracking modes of operation ( single, wordlist, and incremental) differ mostly in the candidate passwords generated: the single and wordlist modes simply attempt presumably-higher-probability password candidates before they would normally be attempted in incremental mode. Most efforts to speed processing by parallelization focus on evenly dispersing the primary computational load over multiple cores, but there are simpler approaches for smaller problem sets (discussed below). ![]() Its two secondary loads (candidate password generation and comparison of computed hashes against those being cracked) are not always insignificant, but are not nearly as computationally intensive or complex as the hash calculations themselves. John the Ripper has one primary workload: generating hashes of candidate passwords.
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