Ssh Keygen 4096 Bit Certificate
Lorean Hoefert
There isn't much info available on 4096-bit SSL certs - but apparently many people have been using 1024-bit certificates until they absolutely had to upgrade and now some browsers won't support the 1024-bit certificates anymore.
How is browser support for 4096-bit certificates? If GoDaddy requires "at least" a 2048-bit certificate, is that enough, or should I try and do something more? If so, what are the advantages and disadvantages?
Pretty much all* browsers will support 4096-bit keys. The issue you'll run into is that key exchange is slower with larger keys, which will increase load on the server and slow down page loading on the client.
If you have a 4096 bit SSL certificate, in order to support some clients (especially Java-based clients and some older clients) you will want to generate a 2048 bit or 1024 bit Diffie-Hellman Key and add it to your server certificate. However, if you support a 1024 bit DH key you should also be aware of the Logjam attack. You can accommodate these clients easily by adding a DH key of the appropriate size, but first carefully consider which clients you want to support.
Hi sorry for answering SOOO OLD thread, but the main point in "NOT" creating 4096 cert is, your CA cert will be 2048, so creating sub cert 4096 is pointless... when even having 2049 bit long cert will make attacker attack your CA cert instead yours.
The GNFS complexity measurement is a heuristic: it's a tool to help you measure the relative strengths of different RSA key sizes but it is not exact. Implementation details, future vulnerabilities in RSA, and other factors can affect the strength of an RSA key. The attack that breaks RSA 2048 could also break RSA 4096.
Bigger RSA key sizes may slow down handshaking from the users point of view. On a Mac or Linux machine you can get some time taken to sign a 2048 bit RSA vs 4096 bit RSA with the openssl speed rsa command:
No. We can re-key pretty quickly, so deploying a 4096 bit key would be pretty easy, but we feel like a 2048 bit key provides a reasonable speed/security/compatibility tradeoff - as we might move to AWS in future, the last one is also a concern for us.
On the other hand, what do we think about using a 4096 bit key? Is 4096 bit RSA horrible and slow? No. Looking at the results, the server CPU use and additional latency could be reasonable for some sites that desire the gain in strength.
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Where do 4096 bit RSA keys for SSL certs currently stand in terms of things like CA support, browser support, etc? In the overall scheme of things is the increased security worth the risk of 4096 bit keys not having the widespread support and compatibility as 2048 bit keys do, not to mention the increased CPU load required to process the key exchange? Are things slowly turning in favor of 4096?
I always generate 4096 bit keys since the downside is minimal (slightly lower performance) and security is slightly higher (although not as high as one would like). Larger keys like 8192 bit or even larger take forever to generate and require specially patched sw to use so are impractical. Luckily there are other algorithms slowly replacing rsa...
Per company security requirement, I need to replace the current machine SSL certificate with 4096-bit SSL certificate. However, I don't see a way to create a CSR with 4096-bit. I believe default is 1024-bit or 2048-bit. Both Certificate Manager and certool does not seem to have an option to specify the bits either.
I am in an organisation where they have a policy to not create a domain certificate via IIS and the local CA. I have to create a CSR and the company policy is that it must have a public key of 4096 bits. I thought 4096 will not work for storefront and I need 2048 or am I wrong?
Hi Robert,
Storefront should be able to handle 4096, assuming you are binding the Certificate on the Netscaler, it would be nice for you if you had an MPX.
VPX would not support this in a certain scenario:
Unfortunately, it is not possible to create a CSR with 4096 key length today. With HPE OneView 4.10 and the appliance put into CNSA Mode (which can break communication with legacy and older systems that cannot support the stronger encryption and cyphers), the CSR would generate a 3072 bit length key.
Just so I understand you correctly, with CNSA Mode the strongest encryption the appliance will generate is 3072 bits. Is it then possible to generate a csr using openssl with the key size set to 4096 and import the cert? In other words, does OneView accept/support certs with a 4096 bit Public key size generated by a csr outside of the appliance's own mechanism?
Differents in this certificates that i found is RSA key lenth. In previous it was 2048, in current - 4096. It's look like my platform (5510) or my software (8.4(3)) doesn't support RSA 4096. But i cant found some official document about this.
This is the first step in the lifecycle of any X.509 digital certificate. Once the private/public Rivest-Shamir-Adleman (RSA) or Elliptic Curve Digital Signature Algorithm (ECDSA) keypair is generated (Appendix A details the difference between the use of RSA or ECDSA), a Certficate Signing Request (CSR) is created. A CSR is basically a PKCS10 formatted message that contains the public key and identity information of the requesting host. PKI Data Formatsexplains the different certificate formats applicable to the ASA and Cisco IOS.
Notes:
1. Check with the CA on the required keypair size. The CA/Browser Forum has mandated that all certificates generated by their member CAs have a minimum size of 2048 bits.
2. ASA currently does not support 4096 bit keys (Cisco bug ID CSCut53512) for SSL server authentication. However, IKEv2 does support the use of 4096 bit server certificates on the ASA 5580, 5585, and 5500-X platforms alone.
3. Use the DNS Name of the ASA in the FQDN field of the CSR in order to prevent Untrusted Certificate warnings and pass Strict Certificate check.
We are using a Self-signed certificate for our SSO with 2048 key size (which we are generating from Salesforce). I understand that this will only last one year. If we switch to 4096 key size, what would be the implications?
Many services do not support 4096-bit keys. A web search came across So you're making an RSA key for an SSL certificate. What key size do you use?, where the author explains the primary differences between the two.
It basically comes down to speed, security, and compatibility. Many platforms are not compatible with 4096-bit keys, using 4096-bit keys will slightly increase the login time, and most feel that the extra security is not currently worth it (including major players like Amazon), since you're just going to be cycling certificates anyways.
Basically, you can either continue to use 2048-bit keys that are known compatible with all major systems, or you can spend a bunch of time researching if all the systems involved will even support 4096-bit keys just for the added convenience of another year of certificate service.
AWS Certificate Manager (ACM) now allows you to import Secure Sockets Layer/Transport Layer Security (SSL/TLS) X.509 certificates of additional key types and key sizes, including Elliptic Curve Digital Signature Algorithm (ECDSA) and RSA 3072 and 4096 keys and bind them with integrated services like Amazon CloudFront and Application Load Balancer. Previously, you could use AWS Identity and Access Management (IAM) to import and use these certificate types as ACM only supported usage of imported RSA 1024 or RSA 2048 key certificates.
SSL/TLS certificates are used to secure network communications and establish the identity of websites over the internet as well as resources on private networks. ACM lets you easily provision, manage, and deploy public and private SSL/TLS certificates. You can use ACM to issue RSA 2048 certificates. However your application may require certificates with different key types or key sizes. ACM now allows you to import and use ECDSA P256, P384, P521 and RSA 3072, 4096 SSL/TLS certificates with integrated services. Specifically, you can use imported ECDSA P256 certificates with Amazon CloudFront and all of the ECDSA and RSA certificate mentioned above with Application Load Balancing. When you import a certificate using the AWS Management Console, you will be informed about the certificate type and the integrated services with which it can be used. This information is also available in the certificate details within the console.