Hi,
I will encrypt with user's public key. I share the document to the user.
How the user decrypt with his private key? without having any utility to
do this job?
presently what iam doing is
*Encryption*
stamper.setEncryption(USER_PASSWORD.getBytes(), OWNER_PASSWORD.getBytes(),
~(PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING),
PdfWriter.ENCRYPTION_AES_256);
and then *signing*
On Mon, Oct 21, 2013 at 4:53 PM, iText Info <i...@1t3xt.info> wrote:
> Op 21/10/2013 13:09, Bapuji Nakka schreef:
> > Hi,
> >
> > How world can see the document. what was the problem in the code?
> > Please correct me if I am understanding it wrongly.
>
> Please show me in which line you ENCRYPT the document. Maybe I'm
> overlooking it.
> I see that you SIGN the document, this means that you add extra info to
> the document, among others a hash of the document bytes that is
> encrypted using a private key, along with the public key that is needed
> to decrypt that hash.
>
> > If i encrypt the document with certificate(private key) then how
> > user decrypt it?
>
> ???
> Encrypting something with a private key is called signing. Every user
> can decrypt such a document using your public key. Your public key is
> supposed to be... PUBLIC, which means the whole world should have access
> to it.
>
> As far as I understand your question, you want to protect the contents
> of a document. In this case, you are going to ask the public key of the
> user(s) for whom the document is intended. You are going to encrypt the
> document using th(os)e public key(s) and only the people who have a
> private key that matches with (one of) the public key(s) will be able to
> decrypt the document.
>
> It goes without saying that these users should keep their private key
> private.
>
> > If i share public key, how user will decrypt it?
>
> This question is invalid.
> If you sign using a private key, the public key is stored inside the
> signature.
> If you encrypt, you don't share your public key, the user shares his
> public key for you to use it in the encryption process.
>
> > Do i need to provide the utility/web access to do this job. it is
> > not possible in my environment.
>
> ???
>
> > what is the best certificate encryption algorithm to follow?
>
> That's a legitimate question, but you need to make up your mind first:
> are you talking about encryption or about signing?
> Because some algorithms are considered better for signing and some are
> considered better for encryption.
>
>
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--
Regards,
Bapuji.Nakka | Scientific Officer
NIC | New Delhi | INDIA
Contact : 011 24101764 Ext : 614
Mobile : +91 9650 814813
Email : bapuji.na...@yahoo.co.in
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