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- Help for pgp !crypter
-
- by
-
- Mike Williams (MEWsoft)
-
- Sept 22nd 1995
-
- !Crypter is designed to simplify the task of decrypting, encrypting and
- signing text files primarily for e-mail, using pgp (Pretty Good Privacy).
-
- This application is useless by itself. To make use of it you need an Acorn
- version of pgp. There is an excellent !pgp version (2.6.2i) by Gareth
- McCaughan which is currently available on hensa, or in the mirror on Demon.
- (There is an earlier version of pgp (2.3) which I do not recommend.)
-
- !pgp is in pub/mirror/micros/arch/riscos/a/a304.
-
- There is also a useful front end which simplifies the process of creating and
- handling keys. It is !PGPwimp by Peter Gaunt and can be obtained from Demon
- in the pub/archimedes directory.
-
- Both of the above applications come with full documentation so I assume you
- are reasonably familiar with the principles underlying pgp.
-
-
- Installation:
- ============
- !Crypter is best stored with !pgp because it needs to have seen !pgp so that
- it knows where to find the keys and other files.
-
-
- Running:
- =======
- Running !Crypter installs it on the Icon Bar and opens its main window.
-
- 1 To decrypt a document:
-
- a The document to be decrypted can be either a file on disc, or you can
- drag the save icon from a newsreader such as !TTFN onto the !Crypter
- Window.
- If the document is indeed encrypted then the decrypt icon on the window
- should be automatically set and the document name inserted into the name
- icon at the bottom.
- Drag the text icon to a directory where you want the decrypted document
- to go. If you keep the same name and drag the icon to the same directory
- then the decrypted file will overwrite the encrypted file.
-
- b The Task Window opens and pgp displays its messages. This part of the
- proceedings is under the control of pgp and !Crypter is no longer
- involved. Close the Task Window when decryption is complete.
-
- 2 To encrypt, or to encryt and sign a document:
-
- a The document to be encrypted must exist as a text file on disc.Typically
- you will have written an e-mail using !Edit or !Zap and now wish to
- encrypt it prior to sending it.
-
- b Drag the file onto the !Crypter Window.
- Select Encrypt or Encrypt and Sign.
- Select the User ID whose public key you have,and to whom you are going to
- send the e-mail (the Target's ID). Either write the ID in the icon or
- click on the selection button on the right. This uses a file inside the
- Resources directory inside !Crypter which you can edit yourself.
-
- (Choosing the Full List option on the name menu gives a full listing of
- all of the public keys on your key ring. This list is created each time
- the program runs. If however you add a key while the program is running
- you will need to exit and restart the program if you wish to use that key
- other than by manually entering the name yourself in the ID icon.)
-
- Drag the text icon to a directory as described in 1.a above.
-
- Proceed as in 1.b
-
- 3 To Sign a document without encrypting.
-
- a As 2a above
-
- b Drag the file onto the !Crypter Window.
- Select Sign.
- Drag the text icon to a directory as described in 1.b above.
-
- Proceed as in 1.b
-
- The name of the signed file ends with "/S"
-
- NOTES
-
- Viewing the output directly
-
- If you wish to view the output from !Crypter without saving it, drag the
- output icon onto a text editor such as !zap. It is best to drag it onto the
- text editor icon on the icon bar. The text can then be read and/or saved
- as required.
- So a typical sequence might be:
- Encounter a PGP encoded e-mail while using !TTFN.
- Save the file (with or without header) directly into !Crypter.
- Drag the !Crypter output onto the !zap icon on the icon bar.
- After pgp does its work the decoded file should appear in a text window.
-
- NB: This process produces some Scrap files inside !Crypter which are deleted
- when !Crypter is exited. If your mail was confidential then you should make
- sure that you do not leave the machine with !Crypter still running.
-
-
- IDEA only encryption
-
- This option allows you to encrypt a file into a very compact binary file
- using a pass word or pass phrase and not using your keys. It is a usefull
- option if you want to store sensitive information on disc (as long as you
- remember the pass phrase). It is not part of the public key system and is
- not designed for sending e-mail puroposes.
-
-
- Verbose Messages
-
- pgp (until a more Acorn orientated version is produced) opens a task window
- and outputs messages describing its progress. If you have the Verbose
- Message option selected then the messages are indeed a bit wordy. By
- deselecting Verbose you cut the messages down to the essentials.
-
-
- Automatic Password
-
- You can avoid the tedium of entering your password every time by editing the
- !Run file inside !Crypter.
-
- The line: |SET PGPPASS "password" should be amended.
- So if your password is "Bambi Lives" then the line should read
-
- SET PGPPASS "Bambi Lives"
-
- This obviously compromises your security if other people have access to your
- computer. Ways of getting around this are described in the pgp documentation
- along with pgp.
-
-
-
- My thanks to Bob Bayford and to Gareth J. McCaughan for beta-testing and
- useful suggestions.
-
-
- Mike Williams (mike@mediajpn.demon.co.uk)
-
- Public Key available from pgp-public-keys@pgp.ox.ac.uk
-
-
-
-
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