Introduction-to-Cryptography日本語版参考書、Introduction-to-Cryptography試験復習

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Objectives
Applied Cryptography	- SSL/TLS Protocols - VPN Security - PGP and Email Encryption - Cryptographic Best Practices
Cryptography Fundamentals	- History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption
Asymmetric Cryptography	- Diffie-Hellman Key Exchange - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI)
Hashing and Digital Signatures	- Message Authentication Codes (MAC) - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256)
Cryptanalysis and Attacks	- Brute Force and Dictionary Attacks - Common Attack Vectors - Social Engineering Prevention
Symmetric Cryptography	- Key Management - Stream Ciphers - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV)

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WGU Introduction to Cryptography HNO1 認定 Introduction-to-Cryptography 試験問題 (Q38-Q43):

質問 # 38
(What are the roles of keys when using digital signatures?)

A. A private key is used for both signing and signature validation.
B. A public key is used for both signing and signature validation.
C. A public key is used for signing, and a private key is used for signature validation.
D. A private key is used for signing, and a public key is used for signature validation.

正解：D

質問 # 39
(A security analyst is using 3DES for data encryption. Which 3DES key size is valid?)

A. 56-bit
B. 112-bit
C. 2,048-bit
D. 128-bit

正解：B

解説：
3DES (Triple DES) applies the DES block cipher three times to increase effective security, and its commonly cited valid key sizes correspond to how many independent DES keys are used. Two-key
3DES uses two 56-bit DES keys (K1 and K2) in an EDE sequence (Encrypt with K1, Decrypt with K2, Encrypt with K1), yielding 112 bits of keying material (ignoring parity bits). Three-key 3DES uses three independent 56-bit keys for a total of 168 bits of keying material, but that option is not listed here.
A 56-bit key corresponds to single DES, not 3DES. 128-bit is associated with AES, not 3DES. 2,048-bit is typical for RSA keys, not symmetric ciphers. Therefore, among the choices provided, 112-bit is a valid 3DES key size. While 3DES is now deprecated for many uses due to its 64-bit block size and performance limitations, understanding its keying options remains important for legacy system assessment.

質問 # 40
(Which number of bits gets encrypted each time encryption is applied during stream encryption?)

A. 0
B. 1
C. 2
D. 3

正解：D

解説：
In the classical definition, a stream cipher encrypts data in very small units-often described as one bit at a time-by combining plaintext with a keystream (commonly via XOR). While many practical stream ciphers operate on bytes or words for efficiency, the conceptual distinction compared to block ciphers is that stream encryption processes data as a continuous stream rather than fixed-size blocks.
This is why the standard teaching answer is "1 bit" per application of the keystream. Block ciphers, by contrast, encrypt blocks like 64 bits (DES/3DES) or 128 bits (AES) in each invocation of the block primitive. Options like 40, 192, and 256 are not typical stream cipher "per-step" processing sizes; 40 and 256 are often associated with key sizes, and 192 could be a key size for AES, not an encryption granularity. The essential security requirement for stream ciphers is that the keystream must be unpredictable and never reused with the same key/nonce combination; otherwise XOR properties allow attackers to recover relationships between plaintexts. Thus, the best answer is 1.

質問 # 41
(How does adding salt to a password improve security?)

A. Salt prevents users from reusing the same password.
B. Salt ensures two people do not have the same password.
C. Salt enforces the complexity rules for passwords.
D. Salt creates a different hash if two people use the same password.

正解：D

解説：
A salt is a unique, random value stored alongside a password hash and combined with the password during hashing. Its main security benefit is that it ensures identical passwords do not produce identical hashes across different accounts or systems. If two users choose the same password, their stored hashes will differ because their salts differ, which directly prevents attackers from spotting shared passwords by comparing hashes. Salts also defeat precomputation attacks such as rainbow tables, because an attacker would need to regenerate tables for each possible salt value-a task that becomes infeasible when salts are large and unique per password. Salt does not enforce password complexity rules (that's a policy/validation function), does not guarantee users choose different passwords, and does not prevent password reuse across sites. The correct statement is that salt makes the resulting hash different even for the same password, improving resistance to offline cracking at scale and eliminating the "same hash = same password" shortcut attackers rely on.

質問 # 42
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)

A. The number of rounds decreases as the key length increases.
B. The number of rounds increases as the key length increases.
C. The key length is the same regardless of the number of rounds.
D. The number of rounds is the same regardless of the key length.

正解：B

解説：
In AES, the number of rounds is explicitly tied to the key length. AES-128 uses 10 rounds, AES-192 uses 12 rounds, and AES-256 uses 14 rounds. The purpose of additional rounds is to increase diffusion and confusion, strengthening resistance against cryptanalysis as the key schedule and state transformations iterate more times. Although key length primarily affects brute-force resistance, AES's designers and standardization parameters link longer keys with more rounds to maintain security margins across variants, especially considering differences in the key schedule structure. Thus, as key length increases from 128 to 192 to 256 bits, the number of rounds increases correspondingly from 10 to 12 to 14. This relationship is fixed by the AES specification and does not vary dynamically at runtime. Therefore, the correct correlation is that the number of rounds increases as the key length increases.

質問 # 43
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Introduction-to-Cryptography学習教材は、当初の目標を達成し、仕事のキャリアをよりスムーズにし、家族の生活の質を向上させるのに役立ちます。 Introduction-to-Cryptography試験トレントを20〜30時間学習するだけで、WGUのIntroduction-to-Cryptography試験に自信を持って参加できると言っても過言ではありません。そして、10年以上にわたってこのキャリアでプロフェッショナルであったため、あなたの成功を確実にすることができます。そして、数千人の候補者が、優れたIntroduction-to-Cryptographyトレーニング資料の助けを借りて、WGU Introduction to Cryptography HNO1夢と野望を達成しました。

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