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  2. John the Ripper - Wikipedia

    en.wikipedia.org/wiki/John_the_Ripper

    One of the modes John can use is the dictionary attack. [6] It takes text string samples (usually from a file, called a wordlist, containing words found in a dictionary or real passwords cracked before), encrypting it in the same format as the password being examined (including both the encryption algorithm and key), and comparing the output to the encrypted string.

  3. Password cracking - Wikipedia

    en.wikipedia.org/wiki/Password_cracking

    A common approach (brute-force attack) is to repeatedly try guesses for the password and to check them against an available cryptographic hash of the password. [2] Another type of approach is password spraying, which is often automated and occurs slowly over time in order to remain undetected, using a list of common passwords. [3]

  4. Collision resistance - Wikipedia

    en.wikipedia.org/wiki/Collision_resistance

    MD5 and SHA-1 in particular both have published techniques more efficient than brute force for finding collisions. [3] [4] However, some hash functions have a proof that finding collisions is at least as difficult as some hard mathematical problem (such as integer factorization or discrete logarithm). Those functions are called provably secure. [2]

  5. Collision attack - Wikipedia

    en.wikipedia.org/wiki/Collision_attack

    An extension of the collision attack is the chosen-prefix collision attack, which is specific to Merkle–Damgård hash functions.In this case, the attacker can choose two arbitrarily different documents, and then append different calculated values that result in the whole documents having an equal hash value.

  6. Cryptographic hash function - Wikipedia

    en.wikipedia.org/wiki/Cryptographic_hash_function

    MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function, MD4, and was specified in 1992 as RFC 1321. Collisions against MD5 can be calculated within seconds, which makes the algorithm unsuitable for most use cases where a cryptographic hash is required. MD5 produces a digest of 128 bits (16 bytes).

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  8. Dictionary attack - Wikipedia

    en.wikipedia.org/wiki/Dictionary_attack

    A dictionary attack is based on trying all the strings in a pre-arranged listing. Such attacks originally used words found in a dictionary (hence the phrase dictionary attack); [2] however, now there are much larger lists available on the open Internet containing hundreds of millions of passwords recovered from past data breaches. [3]

  9. Preimage attack - Wikipedia

    en.wikipedia.org/wiki/Preimage_attack

    By definition, an ideal hash function is such that the fastest way to compute a first or second preimage is through a brute-force attack. For an n-bit hash, this attack has a time complexity 2 n, which is considered too high for a typical output size of n = 128 bits. If such complexity is the best that can be achieved by an adversary, then the ...

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