File encryption/Key encryption ???? Post: 102495

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Top Forums UNIX for Dummies Questions & Answers File encryption/Key encryption ???? Post 102495 by Perderabo on Saturday 18th of March 2006 03:29:46 PM

03-18-2006

Administrator Emeritus

Hmmm..too bad no expert in encryption packages responded to this. I'm not sure what pki is. But this stuff generally flows like this. I would generate a pair of keys. One is my private key. I must keep that secret. The other key is my public key. I can give that out to everyone. It does not matter who knows it. So, for example, I might just publish it...on this website somehow.

Next, let's say you decide to send me a Private Message. Maybe you will just send it in plaintext. Or maybe you will use my public key to encrypt it. How does the recipient(me in this case) know? Well, let's look at two copies of a message, one encrypted and the other in plaintext...

Quote:

$ cat message
Hey Perderabo,

Do you have a typo in that File Permissions tutorial? Isn't it chmod
instead of chdom?

$ cat message2
M2&5Y(%!E<F1E<F%B;RP*"D1O('EO=2!H879E(&$@='EP;R!I;B!T:&%T($9I
M;&4@4&5R;6ES<VEO;G,@='5T;W)I86P_("!)<VXG="!I="!C:&UO9"`*:6YS
1=&5A9"!O9B!C:&1O;3\*"@IT
$

Now in my case I can combine my knowledge of computer science, mathematics, linguistics, and sematics to determine which is the encrypted message. But usually an encryption package will add a header and footer line around the encrypted message. (This includes uuencode, which is what I used to encrypt the above message. I removed the header and the footer.) The only encyption program I can think of that doesn't do this is the original crypt program in unix. And then typically I would feed the encrypted message, including that header and footer into the decryption program. To decrypt the message, I need my private key.

I have not used crypto packages very much. I see some folks putting the public key on their web sites, in signatures, etc. Publicizing your public key is similiar to the problem of publicizing your email address.

With email, by using the mime extentions, you can associate a content type with the email body or with email attachments. So you can send plain text, html, rich text, sometimes even Microsoft Word documents through email. Some encryption packages interact with email the same way. I hope this gets you started. If anyone out there who actually uses this stuff has anything to add, please jump in.

Perderabo

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ledgersmb::mailer

LedgerSMB::Mailer(3pm)					User Contributed Perl Documentation				    LedgerSMB::Mailer(3pm)

NAME

       LedgerSMB::Mailer - Mail output for LedgerSMB

SYNOPSIS

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METHODS

   LedgerSMB::Mailer->new(...)
       Create a new Mailer object.  If any arguments are passed in, a message that uses them will be automatically prepared but not sent.

   $mail->prepare_message(to => $to, from => $from, ...)
       Prepares and encodes base message for sending or adding attachments.

       Arguments

       to, from, cc, bcc
	   Address fields for the email.

       subject
	   The subject for the email.

       message
	   The message body for the email.

       contenttype
	   The conttent type for the body of the message, not for any attachments.

       notify
	   Sets the Disposition-Notification-To header (read receipt request) for the message.	This header will only be added if a from address
	   is set.

   $mail->attach(data => $data, file => $file, filename => $name, strip => $strip)
       Add an attachment to the prepared message.  If $data is specified, use the value of that variable as the attachment value, otherwise attach
       the file given by $file.  If both a file and data are given, the data is attached.  filename must be given and is used to name the
       attachment.

       $strip is an optional string to remove from the filename send with the attachment.

   $mail->send
       Sends a prepared message using the method configured in ledgersmb.conf.

perl v5.14.2							    2012-03-26						    LedgerSMB::Mailer(3pm)