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Full Discussion: To decrypt encrypted password
Top Forums Shell Programming and Scripting To decrypt encrypted password Post 302321051 by robsonde on Saturday 30th of May 2009 12:55:32 AM
Old 05-30-2009
The word encrypted makes you think that there is a de-crypt command of some kind.

The passwords are really “hashed”.

A cryptographic hash function is a deterministic procedure that takes an arbitrary block of data and returns a fixed-size bit string, the (cryptographic) hash value, such that an accidental or intentional change to the data will change the hash value. The data to be encoded is often called the "message", and the hash value is sometimes called the message digest or simply digest.
The ideal cryptographic hash function has four main properties:
• it is easy to compute the hash value for any given message,
• it is infeasible to find a message that has a given hash,
• it is infeasible to modify a message without changing its hash,
• it is infeasible to find two different messages with the same hash.

So if we want to get a password back from a hash we have to do it by guessing and testing.
 

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LEARN ABOUT DEBIAN

hprop

HPROP(8)						    BSD System Manager's Manual 						  HPROP(8)

NAME

     hprop -- propagate the KDC database

SYNOPSIS

     hprop [-m file | --master-key=file] [-d file | --database=file] [--source=heimdal|mit-dump] [-r string | --v4-realm=string] [-c cell |
	   --cell=cell] [-k keytab | --keytab=keytab] [-R string | --v5-realm=string] [-D | --decrypt] [-E | --encrypt] [-n | --stdout]
	   [-v | --verbose] [--version] [-h | --help] [host[:port]] ...

DESCRIPTION

     hprop takes a principal database in a specified format and converts it into a stream of Heimdal database records. This stream can either be
     written to standard out, or (more commonly) be propagated to a hpropd(8) server running on a different machine.

     If propagating, it connects to all hosts specified on the command by opening a TCP connection to port 754 (service hprop) and sends the data-
     base in encrypted form.

     Supported options:

     -m file, --master-key=file
	     Where to find the master key to encrypt or decrypt keys with.

     -d file, --database=file
	     The database to be propagated.

     --source=heimdal|mit-dump|krb4-dump|kaserver
	     Specifies the type of the source database. Alternatives include:

		   heimdal   a Heimdal database
		   mit-dump  a MIT Kerberos 5 dump file
	     +.It Fl k Ar keytab , Fl Fl keytab= Ns Ar keytab The keytab to use for fetching the key to be used for authenticating to the propaga-
	     tion daemon(s). The key hprop/hostname is used from this keytab.  The default is to fetch the key from the KDC database.

     -R string, --v5-realm=string
	     Local realm override.

     -D, --decrypt
	     The encryption keys in the database can either be in clear, or encrypted with a master key. This option transmits the database with
	     unencrypted keys.

     -E, --encrypt
	     This option transmits the database with encrypted keys.

     -n, --stdout
	     Dump the database on stdout, in a format that can be fed to hpropd.

EXAMPLES

     The following will propagate a database to another machine (which should run hpropd(8)):

	   $ hprop slave-1 slave-2

SEE ALSO

     hpropd(8)

HEIMDAL 
							 December 8, 2004							   HEIMDAL
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