Overview#

Crypt is both

• Cryptographic Hash Function and
• An Application to create and change passwords on NIX systems

Cryptographic Hash Function #

Cryptographic Hash Function is used both to generate a new hash for storage and also to hash a proffered password with a recorded salt for comparison.

Modern Unix implementations of the Crypt library routine support a variety of different Ciphers.

The particular Cryptographic Hash Function used can be identified by a unique code prefix in the resulting hashtext, following a pseudo-standard called Modular Crypt Format.

Need to create A Crypt Password#

We often need to do testing and found that we could do this as:

# perl -le 'print crypt("password","salt")'
sa3tHJ3/KuYvI

More Information#

There might be more information for this subject on one of the following:

• Glossary Of LDAP And Directory Terminology
• Password Storage Scheme
• Salt

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• [#1] - Crypt_(C) - based on information obtained 2019-12-30
• [#2] - Crypt Password Storage Scheme - based on information obtained 2019-12-30