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Cracking SHA1 hash with online

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SHA1 is perhaps the worst scenario for securing passwords - except for plaintext storage or schemes without salt. Password cracking tools not only test lists of passwords, but also replace individual letters, such as S with $, double letters, sample combinations of uppercase and lowercase letters for all passwords in the list, combine words, etc.

In reality, the vast majority of passwords can be broken, even most of the complex passwords.

Above all, the difference is how long it takes to crack with specific hardware, whether it takes several months or a few seconds. With good password hashing schemes like Argon2 or Scrypt, cracking takes the longest, with SHA1 or MD5 the shortest.