フリー問題

問題文

A device must hold a private key for its lifetime, and units are installed in publicly accessible cabinets. Which storage arrangement best resists an attacker who can take a unit away and open it?

選択肢

1. The best arrangement is a flash region holding the key encrypted.
2. The best arrangement is a split storage holding the key partially.
3. The best arrangement is a volatile memory holding the key temporarily.
4. The best arrangement is a secure element holding the key internally.