Salesforce.com supports:

SSLv3, TLS, frontdoor.jsp. Ciphers must have a key length of at least 128 bits.

SSLv2, TLS, frontdoor.jsp. Ciphers must have a key length of at least 256 bits.

SSLv2, TLS, frontdoor.jsp. Ciphers must have a key length of at least 128 bits.

SSLv2, TLS, frontdoor.jsp. Ciphers must have a key length of at least 32 bits.

Answer:
SSLv3, TLS, frontdoor.jsp. Ciphers must have a key length of at least 128 bits.

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