Thank you very much David It is exactly what I wanted 2010/6/18 David Shaw <ds...@jabberwocky.com>
> > On Jun 17, 2010, at 11:33 PM, Boris wrote: > > > > > Hi, > > > > > > I would like to know if there is a way to add multiple signatures for a > file (in a separate file) and check who signed with just one command (so not > by signing a signed file...). > > > > Sure. > > > > gpg -u signer_1 -u signer_2 -u signer_3 --detach-sign file-to-sign > > > > You'll end up with a file-to-sign.sig that contains all three signatures. > When you verify file-to-sign.sig, all three signatures will be checked. > > > > Alternately, you can do the same "multiple signer" trick with regular > --sign if you want the data and signatures to be put together into a single > file. > > On Jun 18, 2010, at 9:14 AM, Boris wrote: > > > Ok, Thanks David, > > > > But what if the file is signed by people working on different computers? > > So they will had their signature on the current separate file > (correesponding to the people who already signed a specific file). > > If you want a bunch of people all signing the same file, have each signer > do this: > > gpg -u signer-X -o signer-X-signature --detach-sign file-to-sign > > Then have them all send you their "file-to-sign.sig" files. You create a > file containing all of them: > > cat signer-1-signature signer-2-signature signer-3-signature > > file-to-sign.sig > > Then anyone can verify file-to-sign.sig against the original file-to-sign > and see all the signatures verified. > > David > >
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