$key = md5 ($str);
now, with this $key, you can get $str, right?
is irreversible. Someone asked the password recovery question before, which is why the password can not be recovered and can only be reset.
irreversible md5 is the abstract algorithm. You $str encrypts a million-word novel into a 32-bit string. Do you think this 32-bit string can parse a million-word novel
one-way encryption algorithm, irreversible
if you don't add salt, and $str is very short, such as 6 digits, you can get the result by colliding and running the dictionary.
is irreversible, but because of the small number of MD5 bits, collisions are inevitable (different contents calculate the same MD5), so you can look up the table (rainbow table) to find a corresponding string.
if it is used to store passwords, MD5 is not secure. It is recommended to use a hash algorithm above SHA-256.
if it is used for data integrity checking, MD5 can basically meet the requirements.
is irreversible. Reversible need to write their own encryption algorithm. You can also use AES symmetric encryption with high security, and RSA asymmetric encryption
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