There are many possibilities between completely secret and completely public. In the case of sex offence cases, it's common for the accused to get name suppres

There are many possibilities between completely secret and completely public. In the case of sex offence cases, it's common for the accused to get name suppression, so that only those present in court are aware of their identity. It's still a public trial, involving a jury of citizens. A FISA-type court /could/ operate in a way where a jury made up of members of the public were involved in making the decisions, while being bound by the normal rules of secrecy that require them to not talk about the case outside of the court.