03-16-2006
File encryption/Key encryption ????
My dilemma,
I need to send, deemed confidential, information via e-mail (SMTP). This information is sitting as a file on AIX. Typically I can send this data as a e-mail attachment via what we term a "mail filter" using telnet. I now would like to somehow encrypt the data and send it to a e-mail address external to the company via the internet to a recipient that is probably using Microsoft Outlook. Obviously I what him to somehow decrypt it to be able to use/view the attachment. I have looked at PKI, but the concept is not totally clear to me, as where is the public and private keys held, what key is exchanged and when, how is this done in the context of sending e-mail using SMTP via telnet (is the key an attachment) how does the recipient know this is a key encrypted file and what key to use, how does this relate to the key in his possession, does he need extra software (example). I was looking at tar, compress, gzip, pax and other standard UNIX commands to achieve a password protected file, but have had no luck thus far. Please can you shed some light on at leased some of my question.
Regards
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LEARN ABOUT DEBIAN
ssmtp.conf
SSMTP.CONF(5) BSD File Formats Manual SSMTP.CONF(5)
NAME
ssmtp.conf -- ssmtp configuration file
DESCRIPTION
ssmtp reads configuration data from /etc/ssmtp/ssmtp.conf The file contains keyword-argument pairs, one per line. Lines starting with '#'
and empty lines are interpreted as comments.
The possible keywords and their meanings are as follows (both are case-insensitive):
Root The user that gets all mail for userids less than 1000. If blank, address rewriting is disabled.
Mailhub
The host to send mail to, in the form host port | IP_addr port [: port]. The default port is 25.
RewriteDomain
The domain from which mail seems to come. for user authentication.
Hostname
The full qualified name of the host. If not specified, the host is queried for its hostname.
FromLineOverride
Specifies whether the From header of an email, if any, may override the default domain. The default is ``no''.
UseTLS Specifies whether ssmtp uses TLS to talk to the SMTP server. The default is ``no''.
UseSTARTTLS
Specifies whether ssmtp does a EHLO/STARTTLS before starting SSL negotiation. See RFC 2487.
TLSCert
The file name of an RSA certificate to use for TLS, if required.
AuthUser
The user name to use for SMTP AUTH. The default is blank, in which case SMTP AUTH is not used. sent without
AuthPass
The password to use for SMTP AUTH.
AuthMethod
The authorization method to use. If unset, plain text is used. May also be set to ``cram-md5''.
FILES
/etc/ssmtp/ssmtp.conf
Contains configuration data for ssmtp.
SEE ALSO
ssmtp(8)
AUTHORS
Matt Ryan (mryan@debian.org), Hugo Haas (hugo@debian.org), Christoph Lameter (clameter@debian.org) and Dave Collier-Brown (dav-
ecb@hobbes.ss.org). Reuben Thomas (rrt@sc3d.org) wrote the man page.
BSD
October 7, 2004 BSD