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| Section | Objectives |
|---|---|
| Topic 1: Asymmetric Encryption | - RSA and ECC fundamentals - Public key cryptography principles |
| Topic 2: Foundations of Cryptography | - Core concepts of confidentiality, integrity, authentication, non-repudiation - Historical and modern cryptography principles |
| Topic 3: Cryptographic Protocols and Applications | - TLS/SSL conceptual overview - Secure communication design principles |
| Topic 4: Hash Functions and Message Authentication | - Cryptographic hash functions (e.g., SHA family concepts) - MAC and HMAC mechanisms |
| Topic 5: Key Management and PKI | - Certificates, certificate authorities, and PKI structure - Key exchange and lifecycle management |
| Topic 6: Symmetric Encryption | - AES and legacy algorithms (e.g., DES conceptually) - Block and stream ciphers |
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質問 # 62
(A Linux user password is identified as follows:
$2a$08$AbCh0RCM8p8FGaYvRLI0H.Kng54gcnWCOQYIhas708UEZRQQjGBh4
Which hash algorithm should be used to salt this password?)
正解：D
解説：
The string format $2a$08$... is a well-known identifier for the bcrypt password hashing scheme. In common password-hash notation, the prefix indicates the algorithm and parameters: "$2a$" denotes bcrypt (version
2a), and "08" indicates the cost factor (work factor) controlling how computationally expensive hashing is.
bcrypt is designed specifically for password storage: it includes a built-in salt and is intentionally slow and adaptive, making brute-force and GPU attacks far more expensive than fast general-purpose hashes like MD5 or SHA-512. NTLM and MD5 are obsolete for secure password storage due to speed and known weaknesses.
SHA-512, while cryptographically strong as a hash, is still too fast for password hashing unless used in a dedicated password-hashing construction (e.g., PBKDF2, scrypt, Argon2) with appropriate parameters and salts. Since the given hash clearly matches bcrypt's encoding, the correct algorithm is bcrypt, which incorporates salting and cost-based key stretching as part of its design.
質問 # 63
(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：B
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 # 64
(Which regulation requires organizations to implement strong encryption measures to protect credit card data?)
正解：C
解説：
For protecting credit card data, the primary compliance framework is PCI DSS (Payment Card Industry Data Security Standard). PCI DSS is an industry standard created by major card brands and administered through the PCI Security Standards Council. It sets requirements for organizations that store, process, or transmit cardholder data, including controls around network security, access control, monitoring, and cryptography.
PCI DSS explicitly addresses encryption and protection of cardholder data (for example, protecting stored cardholder data and encrypting transmission over open, public networks, and using strong cryptography and secure protocols). CCPA and GDPR are privacy regulations focused on personal data rights and governance, and while they may encourage security measures, they are not specifically the card-industry security standard for payment data. HIPAA applies to protected health information, not payment card data. Therefore, the correct answer is PCI DSS.
質問 # 65
(How are limits managed for the number of bitcoins that can be created and stored in a blockchain?)
正解：C
解説：
Bitcoin's supply is controlled by protocol rules enforced by consensus: new bitcoins enter circulation through the block subsidy awarded to miners for producing valid blocks. This subsidy is programmed to halve at fixed intervals (every 210,000 blocks), which steadily reduces the rate of new coin creation over time and asymptotically approaches a capped total supply (commonly cited as 21 million BTC). This mechanism is often called the halving schedule and is the primary way limits are managed. The number of participants is not fixed; anyone can run a node or mine. There is no per-country cap and no per-person maximum enforced by the protocol-addresses and ownership are not limited that way. The supply cap emerges from the decreasing issuance schedule combined with consensus validation rules that reject blocks creating coins beyond what the schedule allows. Therefore, the correct answer is that limits are managed because rewards for mining reduce over time.
質問 # 66
(What is the correlation between the number of rounds and the key length used in the AES algorithm?)
正解：A
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 # 67
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2026年PassTestの最新Introduction-to-Cryptography PDFダンプおよびIntroduction-to-Cryptography試験エンジンの無料共有：https://drive.google.com/open?id=1azUHeDkJwn47cSK6Uef0M0B2D4H-cZ1c