I have a 3825 router and I need to install an IOS that supports 3DES. I have read that 3DES is only supported on certain models that doesn't include the 3800 series. Does anyone know if this is still the case, and if there are plans to change it?
as far as I know you can install an image that supports 3DES on a C3800
the right tool is feature navigator
search by platform
I see: there is a C3825 and a Cisco 3825novpn but this just means it misses the HW based encrpytion engine
even C3825 novpn supports 3DES with appropriate image example advanced enterprise with crypto.
the difference is in performance
with the HW module you encrypt more traffic without impacting cpu
Rather there are known legal constraints about where images with 3DES can be used (decided by US government for national security)
Hope to help