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Top Forums UNIX for Dummies Questions & Answers [GPG] System-wide public key? Post 302392749 by Totengraber on Friday 5th of February 2010 09:52:32 AM
Old 02-05-2010
Quote:
Originally Posted by pludi
Again, please tell us as much about what you need as you can. From what you've posted:
  • You have the public key of someone else
  • You need to send them encrypted files
The later can be done, as you have the former.
I did not realize that.

Quote:
Originally Posted by pludi
You are required to send them a public key. Why? Probably because you need to sign the data you send.
I presume this is the case.

Is "signing" different than "encrypting"?

Quote:
Originally Posted by pludi
But how, and with what authority, should your public key be signed?
They do not specify. What would the options be here?

Quote:
Originally Posted by pludi
How do you transmit the data, automatically, or by hand? Would you sign & encrypt it automatically or by hand?
Both will be done via script.

Quote:
Originally Posted by pludi
Sorry for all those questions, but my crystal ball has been sent to the repair shop...
No problem. I appreciate your input.
 

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ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME
ppmtopgm - convert a portable pixmap into a portable graymap SYNOPSIS
ppmtopgm [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b. Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph. QUOTE
Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error. SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)
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