pgp

[Doug Stewart]

Ok I found it.

Gedit has a plug in to do it.
Thanks every body

Doug



On Mon, Aug 10, 2009 at 9:31 PM, Doug Stewart <doug.dastew at gmail.com> wrote:

>
>
> On Mon, Aug 10, 2009 at 9:16 PM, Joel Goguen <jgoguen at jgoguen.ca> wrote:
>
>> On 10 August 2009 21:27:40 Doug Stewart wrote:
>> > I have a file with a public key block , and a message that is incrypted
>> by
>> > the same person.
>> >
>> > How do I use the key to see the message.
>> > What software?
>> >
>> > Ubuntu 9.04
>> >
>> > I know a little about
>> > seahorse  and pgpgpg
>> >
>> > Doug
>> The way public key crypto works is slightly different for signing and
>> encrypting.  In both cases you have a public key (publicly accessible by
>> anyone) and a private key (kept secret, only the sender may have this).
>>  For
>> the sake of simplicity, let's call the sender "Alice" and the receiver
>> "Bob".
>> They both have their own private and public keys.
>>
>> For signing, Alice will sign the message using her private key.  Anyone on
>> the
>> Internet may use her public key to verify the signature and see that it
>> was
>> Alice's private key used to sign the message.
>>
>> Encrypting is basically the opposite.  If Alice wants to send Bob an
>> encrypted
>> message, she would encrypt the message using Bob's public key.  At this
>> point,
>> no one but Bob can decrypt the message.  When Bob receives the message, he
>> will use his private key to decrypt the message.
>>
>> So, if you have an encrypted message, it must be encrypted with your
>> public
>> key, and you would use your private key to decrypt it.  Most mail clients
>> (KMail, Evolution, Thunderbird with Enigmail) can do this automatically,
>> but
>> if not you can save the encrypted block (including the lines before and
>> after
>> starting with dashes) to a file (~/gpg-message.txt) and decrypt with this
>> command:
>>
>> gpg -d ~/gpg-message.txt
>>
>> This will print the message out on the terminal.  If you don't have a
>> private
>> key, or if the message was encrypted using someone else's public key, you
>> won't be able to read it.
>>
>> It's also possible you have a signature - they look similar to encrypted
>> messages, except signed messages have a small block of gibberish after a
>> plaintext message.  This message right here is signed, so you can look at
>> it
>> and see what a signed message looks like.  To verify a signature, simply
>> copy
>> the message to one file (~/plain-message.txt) and the signature to another
>> file
>> (~/gpg-sig.txt) and use this command:
>>
>> gpg --verify ~/gpg-sig.txt ~/plain-message.txt
>>
>> It would of course be preferred to use a mail client that can do this
>> automatically, to avoid the chances of errors copying and pasting the
>> messages/signatures.
>>
>> Hope that helps!
>>
>> --
>> Joel Goguen
>> Ubuntu User #15951
>> When we help, we benefit
>>
>> --
>> ubuntu-ca mailing list
>> ubuntu-ca at lists.ubuntu.com
>> https://lists.ubuntu.com/mailman/listinfo/ubuntu-ca
>>
>> Thanks Joel   - our emails crossed id cyber space.
>
> That is very helpful , I am still wondering about a GUI
> Doug
>
>
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