Hi,
Thanks for your help. Iam using
Security.addProvider(new BouncyCastleProvider());
KeyStore ks = KeyStore.getInstance("pkcs12", "BC");
ks.load(new FileInputStream(cert), certpass);
String alias = (String)ks.aliases().nextElement();
PrivateKey pk = (PrivateKey)ks.getKey(alias, certpass);
Certificate[] chain = ks.getCertificateChain(alias);
ExternalSignature es = new PrivateKeySignature(pk, "SHA-256", "BC");
ExternalDigest digest = new BouncyCastleDigest();
MakeSignature.signDetached(appearance, digest, es, chain, null,
null, null, 0, MakeSignature.CryptoStandard.CMS);
Generated 2046 bit key with openssl*
openssl genrsa -des3 -out keys/ca.key 2046*
On Mon, Oct 21, 2013 at 11:41 AM, iText mailing list <i...@1t3xt.info>wrote:
> On 10/21/2013 8:03 AM, Bapuji Nakka wrote:
> > I am using AES 256 bit encryption. Is this secure from bruit force
> attack?
> > Because i read in articles, above encryption can be cracked easlily
> > in the adobe 9.
> This question is wrong.
> It should read: "Is password encryption secure?" The answer is "No!"
> A follow-up question would be: "Then how do I securely encrypt a PDF?"
> The answer is: "Use certificate encryption?"
> A follow-up question to that question could be: "Is certificate
> encryption ALWAYS secure?"
> The answer is: that depends on the encryption algorithm and the length
> of the key that is used.
>
>
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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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October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
