Tcl array variables are hash tables, and Tcl dictionaries are immutable values based on hashes. Password verification commonly relies on cryptographic hashes. He also hashes the message to get a 256-bit hash sum. NIST does not include MD5 in their list of recommended hashes for password storage. The printable form of MD5 password hashes starts with codice 14. First she hashes the message to a 256-bit hash sum. The ".sha1" file extension indicates a checksum file containing 160-bit SHA-1 hashes in sha1sum format. They are used in creating cryptographic functions such as hashes and ciphers. Systems that do not use cryptographic hashes are vulnerable to IP address spoofing attacks. Entities are named by their cryptographic hashes. The database contained unsalted password hashes, which are vulnerable to dictionary lookups and cracking tools. This defeats "reusing" hashes in attempts to crack multiple passwords. Mercurial uses SHA-1 hashes to identify revisions. Very long lists of pre-computed password hashes can be efficiently stored using rainbow tables. Perl takes lists from Lisp, hashes ("associative arrays") from AWK, and regular expressions from sed.