How can I make a self-signed certificate?

Question

How can I make a self-signed certificate?

ICRabbit 1

I have made a self-sign certificate through the Encrypt file System with ECC 521 bit. But only found that this certificate made by the file system is only used to encrypt files and cannot be used to sign PDF.
How can I make a self-sign certificate with ECC 521 bit which can use to every certificate purpose?
PS：I have knew that the Office or Adobe Acrobat can make a certificate but only with RSA 2048.This is not what I want.

2 answers

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Answer 1

T. Kujala 8,766

Hi @ICRabbit ,

Could this point you to the right direction?

https://learn.microsoft.com/en-us/azure/active-directory/develop/howto-create-self-signed-certificate

ICRabbit 1 Reputation point

2022-05-17T04:54:29.48+00:00

I entered the website you gave.I found that it only support RSA.it is not what I want.
But I wonder if I could change the certificate purpose which made by encrypt file system.If it can be changed, it would also be acceptable

Answer 2

Kapil Arya 8,461 MVP Volunteer Moderator

Hello,

See if this guide helps you anyway:

https://www.kapilarya.com/generate-self-signed-ssl-certificate-in-windows-10-server

Let us know if this helps!

Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.

ICRabbit 1 Reputation point

2022-05-21T05:07:03.427+00:00

It helps. But I still have some problems.
First, I followed the example to make certificate that only for Client Authentication not for PDF signature even all purpose. How can I make a certificate for all purpose? The description of parameters seem not mentioned.
next, the Signature hashing algorithm seems only SHA256 bit, but I saw that the file encrypting system can make a SHA512 bit certificate. Could I make the same?

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How can I make a self-signed certificate?

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