Deprecated security parameter in Oracle 12c: SEC_CASE_SENSITIVE_LOGON

Oracle states:

"The use of the Oracle instance initialization parameter SEC_CASE_SENSITIVE_LOGON is deprecated in favor of setting the SQLNET.ALLOWED_LOGON_VERSION_SERVER parameter to 12 to ensure that passwords are treated in a case-sensitive fashion.
Disabling password case sensitivity is not supported in Exclusive mode (when SQLNET.ALLOWED_LOGON_VERSION_SERVER is set to 12 or 12a.)

See this post for an example used during implementation

Documentation here