CREATE TABLE secure_fields (
    id     INTEGER UNSIGNED PRIMARY KEY AUTO_INCREMENT NOT NULL, 
    salt   INTEGER UNSIGNED NOT NULL, 
    passwd CHAR(40) NOT NULL 
);

##</code><code>##

plaintex_passwd  = The plaintext password from the user 
hex()  = Hex encoding function
SHA1() = SHA1 digest function
salt   = Random 32-bit value (doesn't need to be a cryptographically secure random num)
+      = String concat

hex( SHA1( salt + SHA1( salt + plaintext_passwd ) ) )