Steps to determine if certificate is 128 or 256 bit

What are the steps necessary to determine if a certificate is 128 bit or 256 bit?
IT GuyNetwork EngineerAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
What kind of certificate?
Assuming this is a web server certificate and it is installed and configured, then open the site in a browser, then you should open the certificate view dialog. Look at the certificate properties, all the information is there.
IT GuyNetwork EngineerAuthor Commented:
How can I make this determination just by looking at the certificate text in a notepad document?

Is the 256-bit certificate longer than the 128-bit certificate?
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Prabhin MPEngineer-TechOPSCommented:
Use the following command in linux to see about the certificate details.
there you can see the signature alogorithm and other details,

If you are using windows type mmc in run-> file=> add-snap-in > certificates> localcomputer> import your certifcate> see the details

openssl  x509 -in selfsigned.crt  -noout -text

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IT GuyNetwork EngineerAuthor Commented:
Also what websites can you go to where you can paste the certificate contents (that are visible when opening the certificate in a text or notepad file) that will let you know if the certificate is 128-bit or 256-bit? Please provide me with the exact URLs for these websites.
Prabhin MPEngineer-TechOPSCommented:
Hi ,
Please find the following URL,
Prabhin MPEngineer-TechOPSCommented:
nociSoftware EngineerCommented:
openssl x509 -in cert.pem  -text -noout | egrep '(Signature|Key)'

Will tell you the signature hash size & type!  as well as the key sizes.
IT GuyNetwork EngineerAuthor Commented:
Are there any ways of determining if a certificate is 128-bit or 256-bit simply by examining its contents in a notepad document?

Is a 256-bit certificate longer than a 128-bit certificate or are there any other patterns that can be determined by examining the contents of a certificate within a notepad document?
David Johnson, CD, MVPOwnerCommented:
if you open a certificate in notepad
you will see
a bunch of apparently junk data
-----End Certificate-----
What is in-between is encoded bits

So there is no method of determining by loading the certificate into notepad
Prabhin MPEngineer-TechOPSCommented:

As David said , it not possible to see details of certificate using notepad as it's encoded. You have to use openssl or any other tools to extract the details.
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