Miscarriage of Justice

There has been some debate about the legitimacy of Canada's system of "security certificates."  Under the security certificate program, the federal government can detain individuals without any formal charges.  In a current secret case before the Supreme Court of Canada, one man was detained for over three and a half years without formal charges.  There are many problems with this program, but the fact that the Supreme Court legitimizes the government's actions by holding this hearing in secret seems to be a serious miscarriage of justice. Is there any justification for a "security certificate" program?