H
Hal Murray
Guest
That assumes good key management. In particular, that no box that
holds the private key has ever been trojaned.
--
These are my opinions, not necessarily my employer's. I hate spam.
holds the private key has ever been trojaned.
--
These are my opinions, not necessarily my employer's. I hate spam.
J
Joerg
Guest
Paul Hovnanian P.E. wrote:
signature from a document and paste it into another document that has
been modified so it is a tad more to the liking of the big chief?
So far all my clients have insisted on a mailed document with some real
ink on there. And so do I.
--
Regards, Joerg
http://www.analogconsultants.com
That's what I meant. What would prevent someone from taking your pasted
signature from a document and paste it into another document that has
been modified so it is a tad more to the liking of the big chief?
So far all my clients have insisted on a mailed document with some real
ink on there. And so do I.
--
Regards, Joerg
http://www.analogconsultants.com
P
Paul Hovnanian P.E.
Guest
Joerg wrote:
and send that in an e-mail signed with PGP or something similar.
--
Paul Hovnanian mailto
aul@Hovnanian.com
------------------------------------------------------------------
It's easier said than done.
.... and if you don't believe it, try proving that it's easier done than
said, and you'll see that it's easier said that `it's easier done than
said' than it is done, which really proves that it's easier said than
done.
If its got to be electronic, you can do an MD5 digest on the document
and send that in an e-mail signed with PGP or something similar.
--
Paul Hovnanian mailto
aul@Hovnanian.com------------------------------------------------------------------
It's easier said than done.
.... and if you don't believe it, try proving that it's easier done than
said, and you'll see that it's easier said that `it's easier done than
said' than it is done, which really proves that it's easier said than
done.
S
Stephen J. Rush
Guest
On Sat, 21 Apr 2007 23:15:58 -0700, Paul Hovnanian P.E. wrote:
(easy enough; Gnu Privacy Guard is free) and exchange public keys (also
easy, because you can do that by non-secure email or use the MIT
keyserver). The hard part may be convincing the other party to trust
public-key cryptography. The fact that it works isn't enough. Some
organizations have strange rules... "Oh no! You signed in _blue_ ink! Now
we have to start over. In triplicate." No kidding. That happened when I
bought my house. The fact that the old blue-blind copy process hasn't
been used in decades makes no difference to the lawyers, who don't even
know the reason for that obsolete rule.
BTW, MD5 has been replaced by the SHA2 family for high-security
applications. MD5 turned out to be less collision-resistant than had been
believed.
That requires that all parties have compatible public key crypto software
(easy enough; Gnu Privacy Guard is free) and exchange public keys (also
easy, because you can do that by non-secure email or use the MIT
keyserver). The hard part may be convincing the other party to trust
public-key cryptography. The fact that it works isn't enough. Some
organizations have strange rules... "Oh no! You signed in _blue_ ink! Now
we have to start over. In triplicate." No kidding. That happened when I
bought my house. The fact that the old blue-blind copy process hasn't
been used in decades makes no difference to the lawyers, who don't even
know the reason for that obsolete rule.
BTW, MD5 has been replaced by the SHA2 family for high-security
applications. MD5 turned out to be less collision-resistant than had been
believed.
S
SuperM
Guest
On Thu, 19 Apr 2007 15:34:51 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
document. In order to make changes, changes cannot be locked out.
You should be the author of the document as well, at the very least.
Take your super macro digital camera, and take a super macro shot of
the signature, and import the super fine, super macro, high resolution
jpeg into your super PDF authoring application.
V I O L A!
No need to thank me, as I know you'll use your hard ass attitude to
filter me despite that fact that your question was unfalteringly
answered. Have a nice life. You should also have digital signatures
placed INSIDE the jpeg file, and have it notarized if you intend on
using it as a true digital signature, which is not universally
recognized in industry or business yet, so further research via an
appropriate business law attorney might be in order as well.
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
First, you have to look at the "properties" of the existing PDF
document. In order to make changes, changes cannot be locked out.
You should be the author of the document as well, at the very least.
Take your super macro digital camera, and take a super macro shot of
the signature, and import the super fine, super macro, high resolution
jpeg into your super PDF authoring application.
V I O L A!
No need to thank me, as I know you'll use your hard ass attitude to
filter me despite that fact that your question was unfalteringly
answered. Have a nice life. You should also have digital signatures
placed INSIDE the jpeg file, and have it notarized if you intend on
using it as a true digital signature, which is not universally
recognized in industry or business yet, so further research via an
appropriate business law attorney might be in order as well.
S
SuperM
Guest
On Thu, 19 Apr 2007 16:30:02 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
With PDF authoring, particularly with the actual Adobe authoring tool
(acrobat), digital signing is very good, as you LOCK the document with
a very large, hard to break, encryption key. You have options as to
editable fields, in the case of forms design, OR you can just make it
a hard, non-editable work.
Adobe supports this feature since v6 IIRC. If not earlier. My
resistor code printout is one example of a document made into a PDF
that is non-editable, and signed. If you have my Resistor decoder (I
think you complimented me on it), you can look at the properties
dialog on the PDF when you bring it up in either the viewer or the
authoring tool (acrobat).
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
With PDF authoring, particularly with the actual Adobe authoring tool
(acrobat), digital signing is very good, as you LOCK the document with
a very large, hard to break, encryption key. You have options as to
editable fields, in the case of forms design, OR you can just make it
a hard, non-editable work.
Adobe supports this feature since v6 IIRC. If not earlier. My
resistor code printout is one example of a document made into a PDF
that is non-editable, and signed. If you have my Resistor decoder (I
think you complimented me on it), you can look at the properties
dialog on the PDF when you bring it up in either the viewer or the
authoring tool (acrobat).
S
SuperM
Guest
On Fri, 20 Apr 2007 20:08:09 -0700, "Paul Hovnanian P.E."
<paul@hovnanian.com> Gave us:
Not with Adobe PDFs.
The key is... well... the key. anyone can make it appear as if
they have copied your document, or signature, but in a deeper
inspection, their key being different than the one you have locked
away in your records will make all the difference at a trial.
They have VERY strong encryption.
Try to make my "Resistor Decoder" pdf "editable". I'll bet you
cannot. The key is very long, and only I have it.
I can change the author, etc. All kinds of attributes, but the key is
what keeps other from doing anything I have not authorized.
<paul@hovnanian.com> Gave us:
Not with Adobe PDFs.
The key is... well... the key. anyone can make it appear as if
they have copied your document, or signature, but in a deeper
inspection, their key being different than the one you have locked
away in your records will make all the difference at a trial.
They have VERY strong encryption.
Try to make my "Resistor Decoder" pdf "editable". I'll bet you
cannot. The key is very long, and only I have it.
I can change the author, etc. All kinds of attributes, but the key is
what keeps other from doing anything I have not authorized.
S
SuperM
Guest
On Sat, 21 Apr 2007 23:15:58 -0700, "Paul Hovnanian P.E."
<paul@hovnanian.com> Gave us:
Not even needed. The key the author uses via adobe acrobat is the
key that makes the document unique. Anyone can scan or attempt to copy
it, but their key will not be the same, and it is easily discovered to
be fraudulent.
The features that Acrobat incorporates directly into their own
document management schema is all that one needs.
I will post an example of a locked document that is useable in any
US court of law. You cannot break it. The key IS the key.
<paul@hovnanian.com> Gave us:
Not even needed. The key the author uses via adobe acrobat is the
key that makes the document unique. Anyone can scan or attempt to copy
it, but their key will not be the same, and it is easily discovered to
be fraudulent.
The features that Acrobat incorporates directly into their own
document management schema is all that one needs.
I will post an example of a locked document that is useable in any
US court of law. You cannot break it. The key IS the key.
S
SuperM
Guest
On Sun, 22 Apr 2007 02:41:48 -0400, "Stephen J. Rush"
<sjrush@comcast.net> Gave us:
makes your document unique to you, and it cannot be broken by anyone.
<sjrush@comcast.net> Gave us:
All this nonsense is not required. Adobe incorporates features that
makes your document unique to you, and it cannot be broken by anyone.
S
SuperM
Guest
On Fri, 20 Apr 2007 23:30:43 -0500,
hal-usenet@ip-64-139-1-69.sjc.megapath.net (Hal Murray) Gave us:
Another reason to only use what is already incorporated into the
authoring tool for the PDF document.
hal-usenet@ip-64-139-1-69.sjc.megapath.net (Hal Murray) Gave us:
Another reason to only use what is already incorporated into the
authoring tool for the PDF document.
S
SuperM
Guest
On Fri, 20 Apr 2007 00:02:14 GMT, "Michael A. Terrell"
<mike.terrell@earthlink.net> Gave us:
<mike.terrell@earthlink.net> Gave us:
But no fertilizer to fill them with.
S
SuperM
Guest
On Fri, 20 Apr 2007 00:34:03 GMT, Joerg
<notthisjoergsch@removethispacbell.net> Gave us:
Was it diesel or gas?
<notthisjoergsch@removethispacbell.net> Gave us:
When will you learn when to breathe, and when NOT to breathe?
Was it diesel or gas?
S
SuperM
Guest
On Fri, 20 Apr 2007 01:28:49 GMT, Joerg
<notthisjoergsch@removethispacbell.net> Gave us:
They are CNG! Much safer.
A single 50 gallon LNG tank can blow up a quarter of a city block.
Three CNG tanks last several days on the bus, and are far safer.
CNG does not emit smoke, unless the engine is so old, the intake
valves are sucking oil past the guides.
Unless... of course... it is a big dog. :-]
<notthisjoergsch@removethispacbell.net> Gave us:
Wrong! There are no "LNG" busses anywhere in the US. Are you crazy!?
They are CNG! Much safer.
A single 50 gallon LNG tank can blow up a quarter of a city block.
Three CNG tanks last several days on the bus, and are far safer.
Black smoke = diesel.
CNG does not emit smoke, unless the engine is so old, the intake
valves are sucking oil past the guides.
Take a garbage bag with you. Bag the dog, and hold your breath.
Unless... of course... it is a big dog. :-]
S
SuperM
Guest
On Fri, 20 Apr 2007 14:13:09 -0400, "Oppie" <boppie@nospam-ludl.com>
Gave us:
Gave us:
You are so full of shit.
S
SuperM
Guest
On Thu, 19 Apr 2007 18:29:29 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
We made a 20kV filtering device for making old fryer oil usable for
another 3 months. That made me think about never eating French fries
again.
HV makes the oil particles clomp together such that ordinary
filtering media captures it. Turns 3 micron scum particles into ten
micron globules. VIOLA! a 5 micron filter and a strong pump are all
Mickey D needs to extend the life of his nasty old oil!
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> Gave us:
We made a 20kV filtering device for making old fryer oil usable for
another 3 months. That made me think about never eating French fries
again.
HV makes the oil particles clomp together such that ordinary
filtering media captures it. Turns 3 micron scum particles into ten
micron globules. VIOLA! a 5 micron filter and a strong pump are all
Mickey D needs to extend the life of his nasty old oil!
S
SuperM
Guest
On Sat, 21 Apr 2007 08:24:42 +1200, Barry Lennox
<bt.l.barryl@spamgourmet.com> Gave us:
Wood Chipper?
Hay Bailer?
<bt.l.barryl@spamgourmet.com> Gave us:
Wood Chipper?
Hay Bailer?
J
Joerg
Guest
Paul Hovnanian P.E. wrote:
)
--
Regards, Joerg
http://www.analogconsultants.com
Probably. But mail is only 41c (or 84c international) and amazingly fast
)--
Regards, Joerg
http://www.analogconsultants.com
J
Joerg
Guest
SuperM wrote:
one for a while (in the Netherlands).
It's a Rottweiler and a Shepherd mix ;-)
--
Regards, Joerg
http://www.analogconsultants.com
Sorry, I meant CNG. There are LPG propane vehicles though. I have driven
one for a while (in the Netherlands).
It's a Rottweiler and a Shepherd mix ;-)
--
Regards, Joerg
http://www.analogconsultants.com
J
Joerg
Guest
SuperM wrote:
Diesel.
--
Regards, Joerg
http://www.analogconsultants.com
Diesel.
--
Regards, Joerg
http://www.analogconsultants.com
S
SuperM
Guest
On Sun, 22 Apr 2007 16:37:42 GMT, Joerg
<notthisjoergsch@removethispacbell.net> Gave us:
Ok... Then just bag his head, and steer clear of the snapping and
gnashing teeth!
<notthisjoergsch@removethispacbell.net> Gave us:
Ok... Then just bag his head, and steer clear of the snapping and
gnashing teeth!