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まず、WGUのIntroduction-to-Cryptography試験で100％の合格率を保証できます。 Introduction-to-Cryptography練習クイズには、タイミング機能を備えた模擬試験システムが装備されているため、学習結果をいつでも確認し、欠陥のチェックを続け、体力を向上させることができます。 第二に、Introduction-to-Cryptographyラーニングガイドの使用期間中、24時間の無料オンラインサービスも提供します。これは、Introduction-to-Cryptography試験問題に関する問題をいつでも解決するのにWGU Introduction to Cryptography HNO1役立ちます。
| Section | Objectives |
|---|---|
| Topic 1: Key Management and PKI | - Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management |
| Topic 2: Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Topic 3: Hash Functions and Message Authentication | - Cryptographic hash functions (e.g., SHA family concepts) - MAC and HMAC mechanisms |
| Topic 4: Cryptographic Protocols and Applications | - Secure communication design principles - TLS/SSL conceptual overview |
| Topic 5: Symmetric Encryption | - AES and legacy algorithms (e.g., DES conceptually) - Block and stream ciphers |
| Topic 6: Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
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質問 # 23
(What is the Enigma machine known for in the history of cryptography?)
正解：D
解説：
The Enigma machine is historically known as an electro-mechanical cipher device used primarily by Nazi Germany to secure military and diplomatic communications during World War II. It implemented a polyalphabetic substitution through a system of rotors, a reflector, and a plugboard, producing a large number of possible daily key settings. Operators would configure rotor order, ring settings, initial positions, and plugboard swaps, then type messages to generate ciphertext. Enigma's operational security depended heavily on correct procedures and secrecy of keys; weaknesses in procedures and design properties, combined with brilliant cryptanalysis and engineering efforts by Allied codebreakers (notably at Bletchley Park), enabled large-scale decryption of Enigma-encrypted traffic. In cryptography history, Enigma represents the transition from manual ciphers to machine-assisted encryption and demonstrates how both mathematics and operational practices determine real-world security. It is not simply an "algorithm" in the modern software sense, and it is not a decryption method or email encryption tool. Therefore, the correct description is that it was a device used for secure communication during WWII.
質問 # 24
(What is modular arithmetic in cryptography?)
正解：D
解説：
Modular arithmetic is the mathematics of working with remainders after division by a fixed number called the modulus. In cryptography, it underpins many core constructions because it defines arithmetic in finite sets (rings and fields) where values "wrap around," enabling stable, repeatable operations with bounded results.
Public-key systems like RSA rely on modular exponentiation (raising integers to powers modulo a composite number), while Diffie-Hellman and many elliptic-curve schemes operate in groups defined by modular arithmetic properties. Encryption and key exchange use modular operations because they allow efficient computation forward (e.g., exponentiation modulo a large number) while making certain inverse problems computationally hard without secret information (e.g., factoring or discrete logarithms). Modular reduction also helps keep intermediate values manageable and supports group properties needed for proofs of security.
Although modular arithmetic is not "encryption by itself," it is a foundational method used inside encryption algorithms and protocols. Therefore, among the options, describing it as a method used for encryption via modular operations best matches cryptographic usage.
質問 # 25
(What is an attribute of RC4 when used with WEP?)
正解：D
解説：
In classic WEP deployments, RC4 was used with what is commonly called "40-bit WEP" (also labeled
"64-bit WEP" because it combines a 40-bit secret key with a 24-bit IV to form a 64-bit RC4 seed). The key attribute emphasized in many foundational descriptions of WEP is this 40-bit shared secret length, which was originally chosen due to export restrictions and legacy constraints. Although "104-bit WEP" (sometimes called "128-bit WEP," again counting the 24-bit IV) also existed, the option set here points to the historically standard and widely referenced attribute: a 40-bit key when RC4 is used in WEP.
Importantly, WEP's security failure is not only about key size; the 24-bit IV is too small and repeats frequently, and WEP's key scheduling vulnerabilities combined with IV reuse allow attackers to recover the secret key with enough captured frames. Still, among the given options, the correct attribute is the 40-bit key.
質問 # 26
(Which is an example of asymmetric encryption?)
正解：A
解説：
Asymmetric cryptography uses a public/private key pair where different keys are used for related operations (encryption/decryption or signature/verification). Elliptic-Curve Cryptography (ECC) is a family of asymmetric algorithms built on the mathematics of elliptic curves over finite fields. ECC supports key exchange (ECDH), digital signatures (ECDSA/EdDSA), and other primitives with smaller key sizes for comparable security to traditional discrete-log or RSA systems (e.g., a 256-bit ECC key is often comparable in security to a 3072-bit RSA key, depending on scheme and parameters). By contrast, SHA-256 is a cryptographic hash function (one-way digest), and HMAC is a keyed integrity/authentication construction built from a hash function-neither is encryption. DES is a symmetric block cipher (same key for encryption and decryption). Therefore, the example of asymmetric encryption among the options is ECC.
質問 # 27
(Which number of bits gets encrypted each time encryption is applied during stream encryption?)
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 # 28
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