Encryption and Decryption Using Hash and Verify

Abstract

The encryption key is derived from the password
in password-based encryption. Most implementations of
Password-based Encryption will be supplemented with a
randomization technique, known as salt, to make the task
of going from keyword to key exceedingly time-consuming
for an attacker. Password hashing is a basic method of
saving a database's user passwords. Users submit their
password, which is then sent through a hash algorithm,
which converts it to a fixed-length string of random
characters. MD5 and SHA256 are two popular hash
functions. When a password is "hashed," it indicates it's
been converted into a scrambled version of itself. A user's
password is taken, and the hash value is calculated using a
defined algorithm from the combination of the password
and the key, using a key known to the site. Password verify
() checks to see if the hash matches the password. The
algorithm, cost, and salt are included in the hash returned
by password hash ().As a result, it contains all of the
information required to verify the hash. This allows the
verify function to validate the hash without requiring a
separate stroge for the salt or algorithm. This function is
not vulnerable to timing attacks.