- Certification numbers appear in the lower right of the encapsulated label or on the oval DNA sticker. Verify the validity of PSA & PSA/DNA certification numbers using the form field. If found in our database, the collectible's details will display. Always confirm certification numbers for collectibles purchased online after receipt.
- The thumbprint of a certificate in Mozilla is considered the SHA1 Fingerprint. Option #3: OpenSSL. Serial Number:- openssl x509 -in CERTIFICATEFILE -serial -noout; Thumbprint:- openssl x509 -in CERTIFICATEFILE -fingerprint -noout; Note: Please replace CERTIFICATEFILE with the actual file name of the certificate.
- Enter a coin's NGC certification number (circled in the image) and grade to confirm its description and grade in NGC's database and, if available, view the images of the coin taken by NGC. For coins that have a grade of 1 to 70, enter the certification number, select the numeric grade in.
- In a certificate, the serial number is chosen by the CA which issued the certificate. It is just written in the certificate. It is just written in the certificate. The CA can choose the serial number in any way as it sees fit, not necessarily randomly (and it has to fit in 20 bytes).
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Is certificate serial number a unique key for X509 certificate?User selects a certificate, and program stores serial number in preferences. Will the following code return the selected certificate?
When the certificate viewer opens, click on the Details tab; Locate the Serial Number entry and click on it. The serial number will populate in the bottom portion of. Jun 09, 2015 I lost my printed certificate but i know my CCNA id. Can anybody help me to get the certificatino number? Message was edited by: Raman - Community 43051.
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UPDATE: I ended up using certificate thumbprint, as suggested by jglouie.
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4 Answers
No. For example, OpenSSL let's the user set this when they create certificates.
See: http://www.openssl.org/docs/apps/x509.html
-set_serial n specifies the serial number to use. This option can be used with either the -signkey or -CA options. If used in conjunction with the -CA option the serial number file (as specified by the -CAserial or -CAcreateserial options) is not used.
Certificate Serial Number Format
The serial number can be decimal or hex (if preceded by 0x). Negative serial numbers can also be specified but their use is not recommended.
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As mentioned in another answer, the serial number must be unique within the CA. So serial number alone can't be used as a unique ID of the certificate -- certificates from different CAs can have the same serial number. You need to store combination of Issuer and SerialNumber properties. Also, for self-signed certificates and home-made CA software numbers will most likely collide as many people will start numbering from 0.
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Yes, according to X.509 specification serial number is unique for specific CA:
4.1.2.2 Serial number
The serial number is an integer assigned by the CA to each certificate. It MUST be unique for each certificate issued by a given CA (i.e., the issuer name and serial number identify a unique certificate).
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TL;DR: You must use a composite key of issuer name + serial number. If you need a simple key, use certificate's thumbprint.
Quoting @ThomasPornin from security.stackexchange:
In a certificate, the serial number is chosen by the CA which issued the certificate. It is just written in the certificate. The CA can choose the serial number in any way as it sees fit, not necessarily randomly (and it has to fit in 20 bytes). A CA is supposed to choose unique serial numbers, that is, unique for the CA. You cannot count on a serial number being unique worldwide; in the dream world of X.509, it is the pair issuerDN+serial which is unique worldwide (each CA having its own unique distinguished name, and taking care not to reuse serial numbers).
The thumbprint is a hash value computed over the complete certificate, which includes all its fields, including the signature. That one is unique worldwide, for a given certificate, up to the inherent collision resistance of the used hash function. Microsoft software tends to use SHA-1, for which some theoretical weaknesses are known, but no actual collision has been produced (yet).
From: https://security.stackexchange.com/questions/35691/what-is-the-difference-between-serial-number-and-thumbprint
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Solution
Cert Serial Number Format
The serial number of an SSL certificate can be found by using a few different methods.
Use Internet Explorer to view the certificate
Use Firefox to view the certificate
Use a saved certificate file to view the certificate
Use Firefox to view the certificate
Use a saved certificate file to view the certificate
- Open Internet Explorer
- Visit the secure web site using https
- Locate the pad lock icon in the address bar and perform a click
- Click on View certificates
- The certificate viewer window will open
- Click the Details tab
- Locate the Serial Number entry and click on it. The serial number will populate in the bottom portion of the window.
This can be copied and then pasted or saved.
Method 2:Access web site with FireFox under a secure session
- Open Firefox
- Visit the secure web site using https
- Locate the pad lock icon in the address bar and perform a click
- Click on the More Information button
- Click View Certificate
- In the certificate viewer window, the serial number will be located under the Issued To section
Method 3: Using a saved certificate file
- Obtain the certificate blob from either the approval email or User Portal
NOTE: The x.509 certificate format should be used. Do not use the PKCS#7 format - Copy the text from the e-mail or User Portal and paste into a plain text editor (for example, vi or Notepad).
NOTE: It is not recommended to use Microsoft Word or other word processing programs because they often add invisible characters. Make sure that there are no extra lines or spaces anywhere in the file. Your file should look similar to this example: - Specify a location and save the file by providing a name with a .cer extension
- Locate the .cer file and open it
- When the certificate viewer opens, click on the Details tab
- Locate the Serial Number entry and click on it. The serial number will populate in the bottom portion of the window.
This can be copied and then pasted or saved.