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Full Discussion: Storing Passwords
Top Forums Web Development Storing Passwords Post 302928995 by Corona688 on Tuesday 16th of December 2014 05:49:33 PM
Old 12-16-2014
Quote:
Originally Posted by jim mcnamara
The point is not any of the above. Where do you store the key to decrypt the half-key?

This is a logical fallacy. It is called circular reasoning. I need a key to decrypt a key. I still have to store that secondary key somewhere, or the system will have to regenerate it. Regenerate means I can see it in the source. Storage means it is a sitting duck, unencrypted.
If you agree it's a fallacy, then what were you suggesting with:
Quote:
...the half-keys should be encrypted - both on the user side and the system side.
Unless your point was simply that you shouldn't keep them around indefinitely in retrievable form -- and I don't. I don't encrypt them though, just delete them at regular intervals, as the session times out.
 

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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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