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enable 256 bit encryption ssh for osx

Posted on 2010-11-28
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Last Modified: 2012-08-13
Folks -
How do I enable 256-bit encryption for OSX ssh?
Thanks
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Question by:Gary
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4 Comments
 
LVL 30

Expert Comment

by:Britt Thompson
ID: 34225428
ssh -c "arcfour256" user@server

You have all these encryption options listed in the man pages:

           For protocol version 2 cipher_spec is a comma-separated list of
           ciphers listed in order of preference.  The supported ciphers are
           ``3des-cbc'', ``aes128-cbc'', ``aes192-cbc'', ``aes256-cbc'',
           ``aes128-ctr'', ``aes192-ctr'', ``aes256-ctr'', ``arcfour128'',
           ``arcfour256'', ``arcfour'', ``blowfish-cbc'', and
           ``cast128-cbc''.  The default is

             ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,
             arcfour256,arcfour,aes192-cbc,aes256-cbc,aes128-ctr,
             aes192-ctr,aes256-ctr''

0
 

Author Comment

by:Gary
ID: 34225652
Thanks.  Sorry to not put enough detail.  I am looking to set the default encryption to be 256 AES so if I were to use an app such as sharetool it would use the increased encryption cipher
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LVL 30

Accepted Solution

by:
Britt Thompson earned 1000 total points
ID: 34226743
Here's how it's done:

http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man5/ssh_config.5.html

Just modify the /etc/ssh_config for system wide changes and the ~/.ssh/config for specific user changes.
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Author Closing Comment

by:Gary
ID: 34254671
Thanks renazonse.
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