Introduction-to-Cryptography模擬問題集、Introduction-to-Cryptography関連試験

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

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WGU Introduction to Cryptography HNO1 認定 Introduction-to-Cryptography 試験問題 (Q80-Q85):

質問 # 80
(Two people want to communicate through secure email. The person creating the email wants to ensure only their friend can decrypt the email. Which key should the person creating the email use to encrypt the message?)

• A. Sender's public key
• B. Sender's private key
• C. Recipient's private key
• D. Recipient's public key

正解：D

解説：
To ensure confidentiality so that only the intended recipient can decrypt an email, the sender must encrypt in a way that only the recipient can reverse. In public key cryptography, that means encrypting with the recipient's public key. The recipient is the only party who should possess the matching private key, so only they can decrypt the ciphertext. This pattern is fundamental to PKI-based secure email systems such as S/MIME and OpenPGP: the sender looks up or is provided the recipient's certificate/public key, encrypts the message (often by encrypting a randomly generated symmetric session key with the recipient's public key), and the recipient uses their private key to recover the session key and decrypt the content. Encrypting with the sender' s private key would not provide confidentiality; it resembles signing because anyone with the sender's public key could "decrypt" it. Encrypting with a private key of the recipient is also incorrect because private keys are not shared and should never leave the recipient's control. Therefore, the correct key to encrypt the message so only the friend can decrypt it is the recipient's public key.

質問 # 81
(What is the primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) in relation to encryption?)

• A. To ensure the confidentiality of patient information through secure measures like encryption
• B. To prohibit the use of electronic health records
• C. To allow healthcare providers to encrypt patient records at their discretion
• D. To standardize the use of encryption across all industries

正解：A

解説：
HIPAA is a U.S. regulation focused on protecting the privacy and security of protected health information (PHI). In relation to encryption, HIPAA's Security Rule requires covered entities and business associates to implement appropriate administrative, physical, and technical safeguards to ensure the confidentiality, integrity, and availability of electronic PHI. Encryption is widely recognized as a key technical safeguard for confidentiality-protecting PHI in transit (e.g., over networks) and at rest (e.g., on storage devices) by making data unreadable without the proper keys. HIPAA does not standardize encryption across all industries, nor does it prohibit electronic health records; it regulates how they must be protected. While HIPAA often uses the term "addressable" for encryption controls (meaning organizations must implement it if reasonable and appropriate, or document an equivalent alternative), the overarching purpose remains protection of patient information through secure measures, with encryption as a central mechanism. Therefore, the best answer is ensuring confidentiality of patient information through secure measures like encryption.

質問 # 82
(Why should an asymmetric private key be used to encrypt the digest of an application?)

• A. An asymmetric private key signs files by signing (encrypting) the hash of a file so integrity and authenticity can be verified with the corresponding public key.
• B. An asymmetric private key encrypts a small amount of information, which is decrypted with the corresponding private key.
• C. An asymmetric private key uses the same key to encrypt and decrypt large amounts of media, one bit at a time.
• D. An asymmetric private key encrypts and decrypts data in blocks of characters at a time with a complex algorithm.

正解：A

解説：
Digital signing of software typically works by hashing the application (or its manifest) and then using the publisher's private key to create a digital signature over that digest. The private key is used because it is secret and uniquely controlled by the publisher; only the publisher should be able to produce a valid signature. Verifiers (customers) use the publisher's public key to validate the signature and confirm that the digest matches the software they received. This yields two key properties: integrity (the software hasn't been altered; any modification changes the digest and breaks verification) and authenticity (the signature proves it came from the private-key holder). Option A incorrectly describes symmetric stream encryption. Option C incorrectly generalizes private-key behavior as "block encryption." Option D is wrong because verification uses the public key, not a private key; also,
"encrypting with private key" in this context is better understood as signing, not confidentiality encryption. Therefore, the correct rationale is that the asymmetric private key is used to sign the file's digest so the corresponding public key can verify integrity and authenticity.

質問 # 83
(Which cryptographic operation has the fastest decryption process?)

• A. Symmetric
• B. Hashing
• C. Padding
• D. Asymmetric

正解：A

解説：
Symmetric cryptography generally provides the fastest encryption and decryption performance among common cryptographic operations. Algorithms like AES and ChaCha20 are designed for high throughput and efficient implementation in software and hardware (e.g., AES-NI acceleration). Symmetric decryption is computationally similar in cost to symmetric encryption, and both are far faster than asymmetric operations for equivalent security levels. Asymmetric cryptography (RSA, ECC) involves expensive mathematical operations (modular exponentiation or elliptic-curve scalar multiplication), making it much slower and unsuitable for bulk data decryption. That is why real-world secure protocols use asymmetric cryptography primarily to authenticate peers and establish keys, then switch to symmetric encryption for the actual data stream. Hashing is not decryption at all; it is one-way, and there is no "decrypt" operation for a hash. Padding is not a decryption mechanism; it is a formatting step used with block ciphers to align plaintext length.
Therefore, the correct choice for the operation with the fastest decryption process is symmetric cryptography.

質問 # 84
(Which default port must be allowed by firewalls for the key exchange of the IPsec handshaking process to be successful?)

• A. UDP 443
• B. UDP 500
• C. TCP 443
• D. TCP 500

正解：B

解説：
IPsec's initial key exchange is commonly performed using IKE (Internet Key Exchange), which negotiates Security Associations (SAs), authenticates peers, and establishes shared keys for ESP/AH protection. The traditional and default transport for IKEv1 and IKEv2 is UDP port 500. During negotiation, peers exchange proposals (crypto suites), perform Diffie-Hellman to derive key material, and authenticate using pre-shared keys, certificates, or EAP methods. If a firewall blocks UDP 500, the IKE negotiation cannot begin, preventing IPsec tunnels from forming. In many real deployments, NAT traversal is also used; in that case, traffic typically shifts to UDP 4500 (NAT-T) after detection of NAT, but UDP 500 is still required for the initial exchange and NAT detection in many configurations. TCP 500 is not standard for IKE. Port 443 is associated with HTTPS/TLS and some SSL VPNs, not IPsec IKE. Therefore, among the options provided, the firewall must allow UDP 500 for IPsec key exchange to succeed.

質問 # 85
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