フリー問題

問題文

A consortium ledger gives each member a key pair — a public key and a private key — and names that member by an address worked out from one of the two by a one-way function. A member now reports that the key it signs with is gone, and the consortium must decide between a repeat enrollment and a reset by the operator. Which of the two keys is that address worked out from, and what is the way back for that member?

選択肢

1. That address is worked out from a private key, and the way back for that member is a reset by the operator.
2. That address is worked out from a public key, and the way back for that member is a reset by the operator.
3. That address is worked out from a public key, and the way back for that member is a repeat enrollment.
4. That address is worked out from a private key, and the way back for that member is a repeat enrollment.