SSL session keys are available in which of the following lengths?

SSL/TLS historically used 40-bit symmetric session keys for export-compliant ciphers (required by US export law prior to 2000) and 128-bit keys for full-strength domestic encryption. These two lengths represent the practical range of SSL session key strengths used in real-world deployments.

64-bit is not a standard SSL session key length; SSL skipped from 40-bit export keys directly to 128-bit full-strength keys.

1,024-bit keys are associated with RSA asymmetric key exchange (used for authentication and key negotiation), not the symmetric session keys SSL uses for bulk data encryption.

While 40-bit is a valid SSL session key length, 64-bit is not a recognized SSL symmetric session key length.