WGU Introduction-to-Cryptography試験は簡単に高品質のIntroduction-to-Cryptography出題内容: WGU Introduction to Cryptography HNO1

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

SectionObjectives
Topic 1: Key Management and PKI- Key exchange and lifecycle management
- Certificates, certificate authorities, and PKI structure
Topic 2: Asymmetric Encryption- RSA and ECC fundamentals
- Public key cryptography principles
Topic 3: Cryptographic Protocols and Applications- TLS/SSL conceptual overview
- Secure communication design principles
Topic 4: Foundations of Cryptography- Core concepts of confidentiality, integrity, authentication, non-repudiation
- Historical and modern cryptography principles
Topic 5: Symmetric Encryption- AES and legacy algorithms (e.g., DES conceptually)
- Block and stream ciphers
Topic 6: Hash Functions and Message Authentication- Cryptographic hash functions (e.g., SHA family concepts)
- MAC and HMAC mechanisms

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Introduction-to-Cryptography試験勉強過去問、Introduction-to-Cryptography日本語学習内容

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WGU Introduction to Cryptography HNO1 認定 Introduction-to-Cryptography 試験問題 (Q28-Q33):

質問 # 28
(An administrator has configured a Virtual Private Network (VPN) connection utilizing IPsec transport mode with Encapsulating Security Payload (ESP) between a server in the corporate office and a client computer in the remote office. In which situation can the packet content be inspected?)

正解：C

解説：
With IPsec ESP in transport mode, the payload of the original IP packet (typically the transport-layer segment and higher) is encrypted and integrity-protected between the two endpoints-here, the corporate server and the remote client. Because encryption is applied by the sending endpoint and removed only by the receiving endpoint, intermediate routers, switches, and monitoring devices in either network cannot view the protected payload while it is in transit. They may see outer IP headers and certain metadata needed for routing, but not the encrypted content protected by ESP. As a result, the packet's contents are inspectable only at the endpoints: before encryption on the sender (plaintext exists in memory/stack before IPsec processing) and after decryption on the receiver (plaintext is restored for the application). This is true whether the traffic traverses internal networks or the Internet; the cryptographic boundary is between the endpoints participating in the IPsec SA.
Therefore, inspection of the actual content is possible only on the devices at headquarters and offsite, before sending and after receiving, not by in-transit networks.


質問 # 29
(Which mechanism implemented in WPA-Enterprise guards against bit-flipping exploits?)

正解：C

解説：
Bit-flipping exploits target encryption modes or protocols that do not provide strong integrity, allowing attackers to modify ciphertext so that predictable changes occur in plaintext after decryption. To defend against this, protocols add an integrity mechanism that detects tampering. In WPA (including enterprise deployments), TKIP introduced a Message Integrity Check (MIC) called "Michael." The MIC is computed over the frame contents (with additional fields) and verified by the receiver; if an attacker flips bits in transit, the MIC verification fails, and the frame is rejected. While AES (used by WPA2's CCMP) also provides integrity via authenticated encryption, the option presented that directly names the tamper-detection mechanism associated with guarding against bit-flipping is MIC. A pre-shared key is an authentication/keying method (and not enterprise-mode anyway), and a "global encryption key" would be the opposite of what you want-global/static keys worsen security. Therefore, the intended mechanism that mitigates bit-flipping by detecting unauthorized modifications is the Message Integrity Check.


質問 # 30
(Which attack maps hashed values to their original input data?)

正解：A

解説：
A rainbow table attack uses large, precomputed tables that link hash outputs back to likely original inputs (typically passwords). Instead of storing every password#hash pair directly (which would be huge), rainbow tables store chains created by alternating hash operations with reduction functions, allowing attackers to reconstruct candidate plaintexts that produce a given hash. This makes cracking fast,ifthe target hashes are unsalted and use a known, fast hash function. Salt defeats rainbow tables because the attacker would need separate tables for each salt value, which becomes infeasible when salts are unique and sufficiently large. A dictionary attack is related but typically computes hashes on the fly from a wordlist rather than using precomputed chain structures. A birthday attack targets collisions, not mapping to original data. Brute-force tries all candidates without precomputation.
Because the question explicitly describes mapping hashed values back to original data via a precomputed approach, the correct choice is Rainbow table.


質問 # 31
(What are the roles of keys when using digital signatures?)

正解：C


質問 # 32
(Which operation can be performed on a certificate during the "Issued" stage?)

正解：A

解説：
The "Issued" stage in a certificate lifecycle indicates that the certificate has been generated and signed by the issuing CA and is now valid for use (subject to validity dates, policy constraints, and revocation status). At this point, the operational focus shifts from creating the certificate to making it available to the subject and relying parties. "Distribution" is the lifecycle activity most directly associated with an issued certificate: installing it on servers or endpoints, provisioning it into keystores, publishing it to directories if required, and ensuring the chain (intermediates) is accessible for validation. By contrast,
"Creation" is earlier in the process (key generation, CSR creation, identity validation, issuance
/signing). "Key recovery" and "key archiving" relate to private key management and escrow policies (often for encryption keys, not signing keys), and are governed by organizational policy and key management systems rather than the certificate's issued state itself. A certificate can be distributed after issuance regardless of whether any key escrow features exist. Therefore, the operation that fits the certificate's "Issued" stage best is distribution of the issued credential for operational use.


質問 # 33
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