Hello knaik99,
in addition to what Leo has written you can easily check if your IOS image provides the most advanced encryption algorithms by checking the filename:
if you see a k9 inside the name the IOS image supports 3Des and other advanced encryption methods.
Another important aspect related to k9 code is the support of SSH version 2 or even SSH regardless of version.
The use of a crypto capable images is subject under US Federal laws: they cannot be used in every country in the world.
When you download a k9 image from CCO cisco web site you must declare the image will be used in a country allowed by US Federal laws.
Hope to help
Giuseppe
