Before you order an SSL certificate, we recommend you generate a Certificate Signing Request (CSR) from your server or device.
Online RSA Key Generator. 2048 bit; 4096 bit Generate New Keys Async. RSA Encryption Test. Text to encrypt: Encrypt / Decrypt. A 1024-bit key will usually be ready instantly, while a 4096-bit key may take up to several minutes. For a faster and more secure method, see Do It Yourself below. CryptoTools.net does not yet have a tool for facilitating the encryption and decryption of data using RSA, but you may Do It Yourself with the instructions below. Do It Yourself.
- The 2048-bit is about the RSA key pair: RSA keys are mathematical objects which include a big integer, and a '2048-bit key' is a key such that the big integer is larger than 2 2047 but smaller than 2 2048. The 256-bit is about SSL.
- Online RSA key generation: RSA (Rivest, Shamir and Adleman) is an asymmetric (or public-key) cryptosystem which is often used in combination with a symmetric cryptosystem such as AES (Advanced Encryption Standard).
A CSR is an encoded file that provides you with a standardized way to send DigiCert your public key andother identifying information for your company and domain name. When you generate a CSR, most server software asks for the following information: common name (e.g., www.example.com), organization name and location (country, state/province, city/town), key type (typically RSA), and key size (2048-bit minimum).
Common Platforms & Operating Systems
Microsoft IIS
CSR Generator: DigiCert Certificate Utility
Instructions: IIS 10 IIS 8/8.5 IIS 7 IIS 5/6 IIS 4 PFX Import/Export
Microsoft Exchange Server
CSR Generator: CSR for Exchange 2007 DigiCert Certificate Utility
Instructions: Exchange 2016 Exchange 2013 Exchange 2010 Exchange 2007 PFX Import/Export
Apache Server (Open SSL)
CSR Generator: Open SSL CSR Wizard
Instructions: Apache Server Ubuntu Server with Apache2 PFX Import/Export
Tomcat Server (Keytool)
CSR Generator: Java Keytool CSR Wizard
Instructions: Tomcat Server Java Based Server
Microsoft Lync
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CSR Generator: DigiCert Certificate Utility
Instructions: Lync 2013 Lync 2010
Note: To remain secure, SSL certificates must use keys that are 2048-bits in length or greater. If your server platform can't generate a CSR with a 2048-bit key, please contact us. See this article for more information.
Rsa Key Generation Program
All CSR Creation Instructions by Platform/OS
Rsa 2048 Bits
| # Generate Private Key and Certificate using RSA 256 encryption (4096-bit key) |
| openssl req -x509 -newkey rsa:4096 -keyout privatekey.pem -out certificate.pem -days 365 |
| # Alternatively, setting the '-newkey' parameter to 'rsa:2048' will generate a 2048-bit key. |
| # Generate PKCS#12 (P12) file for cert; combines both key and certificate together |
| openssl pkcs12 -export -inkey privatekey.pem -in certificate.pem -out cert.pfx |
| # Generate SHA256 Fingerprint for Certificate and export to a file |
| openssl x509 -noout -fingerprint -sha256 -inform pem -in certificate.pem >> fingerprint.txt |
| # Generate SHA1 Fingerprint for Certificate and export to a file |
| #openssl x509 -noout -fingerprint -sha1 -inform pem -in certificate.pem >> fingerprint.txt |
| # FYI, it's best practice to use SHA256 instead of SHA1 for better security, but this shows how to do it if you REALLY need to. |
commented Nov 7, 2019
Here's a couple useful links related to this: |
2048 Bit Rsa Key Generator Online
