P.S.PassTestがGoogle Driveで共有している無料の2026 WGU Introduction-to-Cryptographyダンプ：https://drive.google.com/open?id=1azUHeDkJwn47cSK6Uef0M0B2D4H-cZ1c
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| Section | Objectives |
|---|---|
| Topic 1: Cryptography Fundamentals | - History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption |
| Topic 2: Hashing and Digital Signatures | - Digital Signature Standards - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) |
| Topic 3: Cryptanalysis and Attacks | - Common Attack Vectors - Social Engineering Prevention - Brute Force and Dictionary Attacks |
| Topic 4: Symmetric Cryptography | - Block Ciphers (AES, DES, 3DES) - Stream Ciphers - Initialization Vectors (IV) - Key Management |
| Topic 5: Applied Cryptography | - SSL/TLS Protocols - VPN Security - Cryptographic Best Practices - PGP and Email Encryption |
| Topic 6: Asymmetric Cryptography | - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange - RSA Algorithm - Public Key Infrastructure (PKI) |
>> Introduction-to-Cryptography無料サンプル <<
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質問 # 37
(How does a Caesar cipher operate in the encryption of messages?)
正解：C
解説：
A Caesar cipher is a classic monoalphabetic substitution cipher where each plaintext letter is replaced by a letter a fixed number of positions away in the alphabet. For example, with a shift of 3, A becomes D, B becomes E, and so on, wrapping around at the end (X#A, Y#B, Z#C). This "fixed shift" is the entire key: both sender and receiver must know the shift value to encrypt and decrypt. Decryption simply shifts letters back by the same amount. The Caesar cipher illustrates foundational cryptographic ideas: key-based transformation, reversible mapping, and the importance of key space size. Because the key space is tiny (only 25 meaningful shifts in the Latin alphabet), it is easily broken by brute force. It is also vulnerable to frequency analysis because letter frequency patterns in the ciphertext resemble those of the plaintext, just relabeled. While historically important for introducing substitution concepts, it provides no meaningful security by modern standards. The defining operation is the fixed positional shift, which directly matches option D.
質問 # 38
(Which attack may take the longest amount of time to achieve success?)
正解：D
解説：
A brute-force attack exhaustively tries every possible key or password candidate until the correct one is found. Because it explores the full search space (or a very large portion of it), brute force is often the slowest method, especially when strong keys, long passwords, rate limits, and slow password hashing (bcrypt
/Argon2) are used. By contrast, a dictionary attack reduces work by trying only common or likely passwords, often succeeding quickly against weak human-chosen secrets. Rainbow table attacks shift work into precomputation; once a table exists, lookup can be faster than brute-force-though salt and modern hashing defeat them. Birthday attacks are about finding collisions, not necessarily recovering a specific secret, and their expected work is about 2
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