問30
頻出度★★☆
e-TAX など行政への電子申請の際に, 本人証明のために公的個人認証サービスを利用することができる。このサービスを利用する際に使用できるものはどれか。
平成24年度 秋期 ITパスポート試験 問30
ストラテジ系ビジネスインダストリ › ビジネスシステム
This question's explanation and your answers so far.
解説
問 30
Incorrectア
A seal (inkan) registration card is a card used to check a person's registration when someone who has registered an official seal with the municipality receives a seal registration certificate at the counter or at an automatic issuing machine. Its purpose is strictly to certify the official seal in paper-based procedures; it contains neither a Public Personal Authentication Service digital certificate nor a private key for making digital signatures online. It therefore cannot be used to prove your identity for an electronic application to a government agency, so it is wrong.
Incorrectイ
A credit card is a means of payment (credit sales) issued by private companies such as credit finance companies. It is sometimes used to confirm the payer at a store or in online shopping, but that is a credit check that accompanies the payment, not a public identity-verification foundation by which a government agency recognizes you as yourself. Nor does it store a Public Personal Authentication Service digital certificate, so it cannot be used for the digital signature of an electronic application, which makes it wrong.
- ウ
正解 The correct answer is ウ. The Public Personal Authentication Service is a public service in which local governments issue a digital certificate so that, when you file an electronic application with a government agency such as e-Tax (the national tax electronic filing and payment system), you can prove that the application really was made by you (that it is not an impersonation) and that the data you sent was not tampered with on the way. The mechanism is a digital signature based on public-key cryptography: the user attaches a digital signature to the application data with his or her own private key, and the receiving government side verifies that signature with the digital certificate. The container used to carry this digital certificate and private key around is an IC card, and at the time this question was set, in Heisei 24 (2012), the medium that could store a Public Personal Authentication Service certificate was the IC chip of the Basic Resident Register card (Juki card). The user therefore has the digital certificate written onto the Basic Resident Register card at the municipal office counter, and then reads that card with an IC card reader/writer at home in order to file the electronic application. Thus, what can be used when using this service is ウ, the Basic Resident Register card. Note that new issuance of the Juki card has ended due to a change in the system and this role has now been taken over by the Individual Number Card (My Number Card), but the underlying idea of using an IC card that stores an official digital certificate has not changed.
Incorrectエ
A passport is an identification document issued by the state, and it is valid as a document for verifying your identity in person. However, what is recorded on its face and in its IC chip is passport information and a facial image for immigration control; it does not include a Public Personal Authentication Service digital certificate. It does not support the use of attaching a digital signature online and sending application data, so it is wrong.
ここがポイント
- The Public Personal Authentication Service is a service in which the government issues a digital certificate based on public-key cryptography, for verifying the applicant's identity (preventing impersonation) and detecting tampering in electronic applications. The user makes a digital signature with the digital certificate and private key stored on an IC card, and files the application by reading the card with an IC card reader/writer. The storage medium at that time was the Basic Resident Register card; today it is the Individual Number Card (My Number Card).
- There is only one point for telling the options apart: “is it an IC card issued by a public institution that stores a digital certificate?” The seal registration card is for issuing a paper certificate, the credit card is a private-sector means of payment, and the passport is an in-person identification document; none of them holds a digital certificate for electronic applications.
用語