Télécharger md5 hash generator sur PC

         


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MD5, like other hash functions, is used in digital signatures, message authentication codes, to index data in hash tables, for finger-printing, to detect duplicate data, uniquely identify files, and as checksums to detect accidental data corruption.  The data used by hash functions is referred to as a "message", while the computed hash value is referred to as the "message digest".  All it does is compute a hash value for a given set of data.  Because MD5 computes the same hash value for a given message, it's fairly easy to use brute force to lookup a value.  So what's an hash function then? Simply put, a hash function takes a block of data and returns a fixed-size bit string (hash value).  They take the data (messages) and compute hash values (digests).  It's used to compute a hash value in cryptography.  Using MD5 on text data of 750,000 characters, we obtain a mere 32 digits digest.  MD5 produces a 128-bit (16 bytes) hash value.  To get a collision, on average, you'll need to hash about 6 billion files per second for 100 years.  For example, one could precompute the digest of all 8 characters alpha-numeric combinations and they could then scan a password table to see which password corresponds to which digest.  Hash functions are used as one-way methods.  You can't! MD5 is NOT an encryption algorithm! A lot of people are under the impression that MD5 encrypts data.  This is one of the reason why you should use a salt to compute your password digest.  Just avoid using MD5 for password digests or other HIGHLY critical security systems.  MD5 is compact (only 32 digits!), therefore inexpensive on storage, and is also crazy fast to compute.  If you intend to use MD5 as a simple checksum algorithm or for a unique constraint on a database table, it'll work perfectly.  Rainbow tables are reverse-hash lookup tables.  It's usually represented as a hexadecimal number of 32 digits.  If you are unsure about using MD5, you can try SHA-256 instead.  There are LOTS of security guideline on the web to help you out.  MD5 is a message-digest algorithm.  Read about the Birthday Paradox to know more.  MD5 was proven to be non-collision resistant.  It does no such thing.  BUT it really depends on where and how you use it.  The inverse can't be done.  You can't! MD5 is NOT reversible.