問73
頻出度★★★
IoT機器やPCに保管されているデータを暗号化するためのセキュリティチップであり，暗号化に利用する鍵などの情報をチップの内部に記憶しており，外部から内部の情報の取出しが困難な構造をもつものはどれか。
令和元年度 秋期 ITパスポート試験 問73
This question's explanation and your answers so far.
解説
問 73
Incorrectア
A GPU (Graphics Processing Unit) is a processor for high-speed image and video processing and parallel computation; it is not a security chip that safely stores encryption keys. Although it has increasingly been used for general-purpose computing, it is not a component intended to protect keys through tamper resistance, so it is incorrect.
Incorrectイ
NFC (Near Field Communication) is a short-range wireless communication standard that works over a distance of a few centimeters, used for transit IC cards and contactless payments. It is a communication technology, not a security chip that stores data-encryption keys internally, so it is incorrect.
Incorrectウ
TLS (Transport Layer Security) is a protocol (a software-level agreement) for communicating securely by encrypting the communication path; it is not a physical chip. It does not qualify as the “hardware component that stores keys inside a chip” that the stem asks about, so it is incorrect.
- エ
正解 Option エ, TPM (Trusted Platform Module), is a dedicated security chip built into PCs and IoT devices that carries out encryption and decryption, as well as key generation and storage, entirely within the chip itself. It stores secret information such as encryption keys and certificates inside the chip, and it has tamper resistance whereby any attempt to extract that information physically or logically from outside destroys it. This fully matches the stem's description of a structure that keeps keys inside the chip and makes internal information difficult to extract from outside. Therefore the correct answer is エ.
ここがポイント
- TPM is a dedicated security chip built into PCs and IoT devices; it stores encryption keys and the like inside the chip and uses tamper resistance to make internal information difficult to extract from outside.
- Distinguish carefully: GPU (a computation processor), NFC (short-range wireless communication), and TLS (a communication-encryption protocol) all fail to fit the definition of a tamper-resistant chip that stores keys internally.
用語