Cisco IOS version that supports crypto

Can someone tell me a version of IOS that supports the crypto command so I can start using SSH? It is an 1841 router. I'm currently using 12.4(1c) and it doesn't support the crypto or ssh commands.

Thank you,

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RPPreacherConnect With a Mentor Commented:
Cisco Feature Navigator is a great resource for this, but it's down right now.
RPPreacherConnect With a Mentor Commented:
12.4(24)T Advanced Enter Services, Adv IP Servers or Advanced Security
It's back up so there are hundreds of options, all with different memory requirements.
trent_shaneAuthor Commented:
Thank you, fellas.
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