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The Datafile PD-CD 1 Issue 2
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PDCD-1 - Issue 02.iso
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1993-02-04
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Open reply on NetMail, dated Sat,29 Jan 1993, sent
From: Dirk-Willem van Gulik
To: All
Subject: attached files...
Hello
This is a signature programme which uses a public key encryption
method. This is a test version. It signes and checks signatures
attached to mail messages. So you can validate, check and authorize
messages and their contents over a public communication channel.
It also acts as a seal, any changes to the message will render
the singnature invalid.
Future versions will use longer keys. I'd like to ask everyone to
comment upon this programme. See the !Help file for a decent
explanation. This programma also supports the acorn interactive
help application.
In brief
This programme is based on the September article of the AcornUser
and a module called 'BigNumbers' and some discussions on USENet.
Use 'Maker' to create your personal signature and its public components.
The public part can be send to me. I will distrubute them to all the
people participating.
The first time you run !Signature you are asked to enter a password,
this is going to be used to scramble your secret key; Maker just
stores this very precious item on the hard-disc naked! For this you
have to use a 'token sentence', not a single password but a sentence.
!Signature will not quit until you have entered a password sentence.
Example : He himself is quite a good rabbit you know
Drink Driving is a very stupid offence
After this you can use the programme. On consequtive runs you will have
to re-enter the password sentence. If you do not do this, the programme
will behave normally but you are unable to sign messages.
The programme is based on a 'point' situation. People write messages
in an editor. They 'save' these messages normally to their point-programme.
In order to sign it you simply drag it to !Signature to have it signed,
after some seconds a save-as box will open and you can drag it to its
destination. To check someone his signature, which MUST be on the list
just drag is message into !Signature and the programme will report on
the reliablity of the signature. To allow the programme to recognize the
name of the sender, whose public-key it has to look for on the list, it
expect a certain configurable header format. See the !Help file.
Known problems.
Checksums are not perfect, too slow...
No automatic multi level signatures
Only CR or LF line separators, no LF+CR
Sensitive to 'weird' mailer substitutions, some change a '{}' into a [].
Maker: Changes since 1.00b
1.02 More text, better files, filetype=FFF
1.03 Improved randomizing and Prime values
!Signature: Changes since 1.00b
1.01 improved editor, exact MSGblock length (for WL096), more
hourglasses, more i-help-text, check Wimp$Scrap, default
msgnames, auto-scroll tokens
1.02 center windows, menu-option from, remove signature, recenter
after mode change, escape implemented
1.03 compacting bug for numbers corrected, preference window's
pane behaves decently, changed the message file a wee bit
ADJUST on desk-icon
1.04 and above, read the !Help file and the Update_103 explanation.
added a info window. preferences no longer easy acces, more
help text, hard-coded list distribution check, assume sender
protocol improved.
*Signature [KTfxHrI: 9Lt 9Qs''Rh 9|R 9 9rHtI3-Gk"iOD 0]