What determines the size of the rsa keys that can be generated on a device?

According to this pdf:

http://www.Cisco.com/c/en/us/TD/docs/iOS-XML/iOS/security/A1/sec-A1-XE-3...

It seems to me that any device running a before image of Cisco IOS version 15.1 (1) T was able to create a key size of 2048 and any device that is running the image above and those who subsequently would be able to create keys of 4 096

Am I right in saying this. I know it's a bit obscure question where the reason why I am struggling to find an answer to this. Any help much appreciated. TIA

Yes - this is confirmed in the Release Notes for IOS 15.1 (1) T.

(ASA, Wireless controllers etc.) non - IOS devices will have their own dependencies of liberation.

Also - note for some trains of release of IOS 12.x improvements were released after IOS 15.1 (1) T, so those could also have benefits from the support of 4096 bits.

Tags: Cisco Security

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