The aforementioned Debian bug has been fixed upstream. The documentation for "-c" is now more extensive and lists the defaults and supported options.
Debian maintainer: this is -portable ssh.1 rev 1.148.
-c cipher_spec
Selects the cipher specification for encrypting the session. Protocol version 1 allows specification of a single cipher. The
suported values are ``3des'', ``blowfish'' and ``des''. 3des
(triple-des) is an encrypt-decrypt-encrypt triple with three dif-
ferent keys. It is believed to be secure. blowfish is a fast
block cipher; it appears very secure and is much faster than
3des. des is only supported in the ssh client for interoperabil-
ity with legacy protocol 1 implementations that do not support
the 3des cipher. Its use is strongly discouraged due to crypto-
graphic weaknesses. The default is ``3des''. 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'', ``arcfour'',
``blowfish-cbc'', and ``cast128-cbc''. The default is ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,
aes192-cbc,aes256-cbc''--
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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