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Top Forums UNIX for Dummies Questions & Answers File encryption/Key encryption ???? Post 102224 by hugow on Thursday 16th of March 2006 10:12:21 AM
Old 03-16-2006
Data 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 Smilie
 

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STG-MAIL(1)							   StGit Manual 						       STG-MAIL(1)

NAME
stg-mail - Send a patch or series of patches by e-mail SYNOPSIS
stg mail [options] [<patch1>] [<patch2>] [<patch3>..<patch4>] DESCRIPTION
Send a patch or a range of patches by e-mail using the SMTP server specified by the stgit.smtpserver configuration option, or the --smtp-server command line option. This option can also be an absolute path to sendmail followed by command line arguments. The From address and the e-mail format are generated from the template file passed as argument to --template (defaulting to .git/patchmail.tmpl or ~/.stgit/templates/patchmail.tmpl or /usr/share/stgit/templates/patchmail.tmpl). A patch can be sent as attachment using the --attach option in which case the mailattch.tmpl template will be used instead of patchmail.tmpl. The To/Cc/Bcc addresses can either be added to the template file or passed via the corresponding command line options. They can be e-mail addresses or aliases which are automatically expanded to the values stored in the [mail "alias"] section of GIT configuration files. A preamble e-mail can be sent using the --cover and/or --edit-cover options. The first allows the user to specify a file to be used as a template. The latter option will invoke the editor on the specified file (defaulting to .git/covermail.tmpl or ~/.stgit/templates/covermail.tmpl or /usr/share/stgit/templates/covermail.tmpl). All the subsequent e-mails appear as replies to the first e-mail sent (either the preamble or the first patch). E-mails can be seen as replies to a different e-mail by using the --refid option. SMTP authentication is also possible with --smtp-user and --smtp-password options, also available as configuration settings: smtpuser and smtppassword. TLS encryption can be enabled by --smtp-tls option and smtptls setting. The following variables are accepted by both the preamble and the patch e-mail templates: %(diffstat)s - diff statistics %(number)s - empty if only one patch is sent or ' patchnr/totalnr' %(patchnr)s - patch number %(sender)s - 'sender' or 'authname <authemail>' as per the config file %(totalnr)s - total number of patches to be sent %(version)s - ' version' string passed on the command line (or empty) In addition to the common variables, the preamble e-mail template accepts the following: %(shortlog)s - first line of each patch description, listed by author In addition to the common variables, the patch e-mail template accepts the following: %(authdate)s - patch creation date %(authemail)s - author's email %(authname)s - author's name %(commemail)s - committer's e-mail %(commname)s - committer's name %(diff)s - unified diff of the patch %(fromauth)s - 'From: author ' if different from sender %(longdescr)s - the rest of the patch description, after the first line %(patch)s - patch name %(prefix)s - 'prefix ' string passed on the command line %(shortdescr)s - the first line of the patch description OPTIONS
-a, --all E-mail all the applied patches. --to TO Add TO to the To: list. --cc CC Add CC to the Cc: list. --bcc BCC Add BCC to the Bcc: list. --auto Automatically cc the patch signers. --noreply Do not send subsequent messages as replies. --unrelated Send patches without sequence numbering. --attach Send a patch as attachment. -v VERSION, --version VERSION Add VERSION to the [PATCH ...] prefix. --prefix PREFIX Add PREFIX to the [... PATCH ...] prefix. -t FILE, --template FILE Use FILE as the message template. -c FILE, --cover FILE Send FILE as the cover message. -e, --edit-cover Edit the cover message before sending. -E, --edit-patches Edit each patch before sending. -s SECONDS, --sleep SECONDS Sleep for SECONDS between e-mails sending. --refid REFID Use REFID as the reference id. --smtp-server HOST[:PORT] or "/path/to/sendmail -t -i" SMTP server or command to use for sending mail. -u USER, --smtp-user USER Username for SMTP authentication. -p PASSWORD, --smtp-password PASSWORD Password for SMTP authentication. -T, --smtp-tls Use SMTP with TLS encryption. -b BRANCH, --branch BRANCH Use BRANCH instead of the default branch. -m, --mbox Generate an mbox file instead of sending. -O OPTIONS, --diff-opts OPTIONS Extra options to pass to "git diff". STGIT
Part of the StGit suite - see linkman:stg[1] StGit 03/13/2012 STG-MAIL(1)
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