New answers tagged digital-signature
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This is an official information about MD5 - MD5 vulnerable to collision attacks
For higher security SHA-2 should be considered. No one stops users from using MD5, but not for the data you want to keep private.
Performance of hash algorithms
As shown in the diagram "Performance of hash algorithms", SHA256 is way faster then MD5.
This is a good resource to ...
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Basic rules:
Code with "admin privileges" can do everything it wishes with your machine. You cannot protect against it. At best, the malicious code will have to wait for the next time you type your password, at which point it will plunder your private key (and all your secrets).
The same "admin exploit" will modify your icon overlays so as to hide any ...
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According to your comments to other answers, you actually want to
sign a pdf file with [your] certificate, then have this signature saved and appended to the pdf [you]'ve just signed.
(BTW, you sign with the private key associated with the public key in your certificate, not with the certificate itself, but that's a detail.)
I assume you want to ...
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If you want to sign a PDF, most PDF writers, and some versions of the reader-only will have a built in mechanism for signing, and some even for timestamping. It will ask you to provide your certificate file and then it will apply the digital signature into the file. PDFs in particular have this mechanism built into the format, but it is also possible to sign ...
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Your question is really two different questions. A certificate only needs to be signed by another certificate if there needs to be a chain of trust. For example, a root CA will sign the certificates they issue so that anyone trying to verify the certificate will know that it is trusted by the CA. You can do this kind of chaining with any certificate that ...
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A certificate always contains a signature, but on itself, not on some PDF document. This signature is an integral part of the certificate and has been computed by the CA which issued the certificate; this is by verifying this signature that any software can gain some trust in the contents of the certificate. All of this happens independently of any PDF file, ...
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As the certificate is registered to you and fields completed with your details, the certificate is your digital signature. You don't add a digital signature to the certificate.
You need a certificate to be issued by a CA (which you could create). Then add the certificate to your trusted certs (if self-signed or not from an standard recognised CA). When you ...
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