digital-signature

问题 I was going through the official PDF spec. I came across a digitally signed PDF here. While I was analyzing its catalog dictionary, I saw this: I have some queries regarding this: As per page 736 of the spec, FieldMDP has no P parameter, that belongs to DocMDP (page 733). Of course, the PDF might have been modified by some third party who added an extraneous key to the dictionary. But I just want to confirm, if a P key is found in FeldMDP , is it to be ignored, or it has some meaning? As per

问题 I need to create signatures, which consists only of the signing name and date. Additionally, these two fields have to be placed at exact coordinates as the two fields have to be placed in a predefined "revision table". Is this possible? Here´s my code, which is pretty (!) much the same as of Bruno Lowagie´s samples and is probably not even near to the problem´s solution: namespace signatures.chapter3 { public class C3_11_SignWithToken { public static String SRC = "../../../../resources/hello

问题 I'm getting an Org.BouncyCastle.Security.InvalidKeyException with error message Public key presented not for certificate signature when validating a pdf with LtvVerifier . This problem has arisen after circumventing an issue with CRL LDAP URIs. The code used to perform the verification is the same as the previous post: public static bool Validate(byte[] pdfIn, X509Certificate2 cert) { using (var reader = new PdfReader(pdfIn)) { var fields = reader.AcroFields; var signames = fields

问题 If I want to sign the next XML code with envoloped signature: <root> <element> <child>text node</child> </element> </root> Then the Signature XML code takes place inside the signed XML code, in the way shown below: <root> <element> <child>text node</child> </element><Signature xmlns="http://www.w3.org/2000/09/xmldsig#">...</Signature> </root> Notice: no line break nor single character is added outside Signature element since that would invalidate the signature. The XML enveloped signature

问题 First I generate a Signature and place in the txt_EmpSignature text box and then to sign documents i'm using the following argument in the "Sign" button click event handler: RSACryptoServiceProvider MySigner = new RSACryptoServiceProvider(); openFileToSign.ShowDialog(); FileStream file_to_sign = new FileStream(openFileToSign.FileName, FileMode.Open, FileAccess.Read); BinaryReader reader_to_sign = new BinaryReader(file_to_sign); byte[] data_to_sign = reader_to_sign.ReadBytes((int)file_to_sign

问题 I'm new to digital signature. I want to create an example. After lots of research I found this code: iText part3/chapter12 Signatures.java But due to my lack of knowledge, I can't figure out and make my own resource. Is there any way to find resources which define in this code. So I can directly execute it and examine the result and understand it? 回答1: If you go to the "learn" page on the official iText site, you will find a link to a free ebook entitled Digital Signatures for PDF Documents.

问题 I m creating and signing pdf using c#,itextsharp.Now i m using this code for password protection and digital sign.First i am protecting with password.Than i am signing. the transmitted pdf is not asking password while opening? Can someone tellme why is this happening? Thanks.. string passprotectedfile = filename; using (Stream input = new FileStream(signedfile, FileMode.Open, FileAccess.Read, FileShare.Read)) { using (Stream output = new FileStream(passprotectedfile, FileMode.Create,

问题 I have a source HTML document generated from an ASPX. I then convert the html to PDF using ABCPDF. The html has a signature area, which is just a text box with a border. I need a signature field inside the PDF with a name that I can pass on. The PDF will be sent to a third-party who will correspond with the client and then digitally sign the PDF and send it back. Given that I have an html document, or PDF, how do I programmatically add the blank PDF signature field around the original html

问题 I have googled to search answer for these problem.but I'm not able to find proper solution for my question as many answer was specific to problem related. when I tried to create digital signature of content using XMLSecurityKey and openssl_sign I'm getting warning and signature was not created. openssl_sign is throwing error as : Warning: openssl_sign(): supplied key param cannot be coerced into a private key in /var/www/git/ta_client/accessService.php on line 105 And my code is: public

问题 I have a dll file which is digitally signed. I need to write a PowerShell command which could get me the Digest Algorithm that is used for the Digital Signature. Digest Algorithm info I need: I tried with Get-AuthenticodeSignature but this didn't get me the Digest Algorithm info. After running the following command I get the below result. Get-AuthenticodeSignature "C:\Program Files\Application Verifier\vrfauto.dll" | Format-List Results of above: 回答1: So what you are looking for is Get