Is it possible you're confusing encryption with signing?
Your initial question was about encryption, which means you want to
secure a document so that it's protected against people who may not know
the content of the document.
Your code shows that you're signing a document, which means that you
want the whole world to see the document, but you want to assure its
integrity, authenticity and non-repudiation.
Those are two different things, aren't they?
Op 21/10/2013 9:42, Bapuji Nakka schreef:
> 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
> <mailto: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
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> Email : bapuji.na...@yahoo.co.in <mailto:bapuji.na...@yahoo.co.in>
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