digital signature

[firhan pian]

hello...

sory bothering u...

i want to ask about digital signature...

im building a web application system for creating a formal letter online using asp.net (vb) for my project courses.

after creating the letter, sender must to sign (with digital signature) the letter before send it to recipient..

i have install x.509 and cassandra client framework.

i also have read the article you have write...

but, im still not understand how to used it...

sory, it all new to me...so, im slow about it...

can you pleased help me...?

[we-coffee staff]

Hi,
inside the - Program Files (x86)\Cassandra\Bonnie.NET Web Edition
\Examples - folder you can find a lot of example about using
Bonnie.NET
Check them and let me know if they resolve your issues.

[firhan]

ok, i've try the sample project given.
but still dont get it..
dont worries,im still doing on that n still try to understand how to
used it..

but, could u explained if u not mind..
im doing sending electronic letter...
since creating letter done, I (sender) must sign it before sent it to
recipient..

so, 1st of all, i must have the certificate (x509) rite?
then sign the letter with that certificate to recipient using [PKCS#7
multiple digital signatures of texts from ASP.NET web pages]...
is it recipient must have their own certificate (recipient must
download the x509 and install to their pc too..)?

then, how recipient want to check it..

sory, im realy noob...but i've try my best to understand it...
thanx for helping me...



On Apr 19, 6:09 pm, we-coffee staff <cassandra.cen...@gmail.com>
wrote:

[we-coffee staff]

Hi,
I suppose that with electronic letter you mean some content inside a
web page. You are not speaking about e-mail.

With Bonnie.NET you have the possibility to sign some content inside a
web page ad send it to the server for further processing.
To sign the content from the client browser the client need to have
its x509 certificate stored inside its personal user certificate or a
security token.
When he signed the conten, the same is sent to the server as pkcs#7
message.

If you need to send to the recipient the signed message, he need some
piece of code that is able to parse the signed message and extract
information from it. Yo can use the PKCS7Browsers class inside
Bonnie.NET or some other softwares that are able to deal with pKCS7
standard.

About the certificate. If you use for the signature a public
certificate, that is a commercial one or some certificate that is
already trusted by the recipient, that is, that exists inside the
trusted certifcate store of the recipient, you have nothing else to
do. Just use PKCS7Browser or some other PKCS7 softwares and verifiy
it. If you use some personal certificate, as those generated with
X509Builder, the recipient need to install the Certification Authority
(CA) certificate on ints trusted certificate store prior to verify the
signature.