This parameter can contain a list of valid Oracle support encryption algorithm names, such as RC4_56 or RC4_128. If this list is empty, all algorithms supported by Oracle for that Oracle release will be available. The client/server will negotiate on which of these algorithms to use based on Oracle Client Encryption Level setting.
The Oracle Server must also be configured to support this type of encryption.
For a more information about the supported algorithms, refer to the Oracle Advanced Security Administrator’s Guide. See the SQLNET.ENCRYPTION_TYPES_CLIENT section for a list of valid values for the thin JDBC client.