Introduction-to-Cryptography学習体験談 & Introduction-to-Cryptography勉強の資料

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WGU Introduction-to-Cryptography Exam Syllabus Topics:

Section	Objectives
Topic 1: Hashing and Digital Signatures	- Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards - Message Authentication Codes (MAC)
Topic 2: Cryptanalysis and Attacks	- Social Engineering Prevention - Common Attack Vectors - Brute Force and Dictionary Attacks
Topic 3: Symmetric Cryptography	- Key Management - Stream Ciphers - Block Ciphers (AES, DES, 3DES) - Initialization Vectors (IV)
Topic 4: Cryptography Fundamentals	- Symmetric vs Asymmetric Encryption - Cryptographic Terminology - History and Evolution of Cryptography
Topic 5: Applied Cryptography	- Cryptographic Best Practices - PGP and Email Encryption - VPN Security - SSL/TLS Protocols
Topic 6: Asymmetric Cryptography	- RSA Algorithm - Public Key Infrastructure (PKI) - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC)

>> Introduction-to-Cryptography学習体験談 <<

Introduction-to-Cryptography勉強の資料、Introduction-to-Cryptographyトレーリング学習

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WGU Introduction to Cryptography HNO1 認定 Introduction-to-Cryptography 試験問題 (Q39-Q44):

質問 # 39
(Which cipher uses shifting letters of the alphabet for encryption?)

A. Bifid
B. Caesar
C. SHA-1
D. Vigenere

正解：B

解説：
The Caesar cipher is the classic substitution cipher that encrypts by shifting letters of the alphabet by a fixed number of positions (e.g., shift by 3: A#D, B#E, etc.). It is a monoalphabetic cipher because a single shift value is applied uniformly across the entire message, making it simple and vulnerable to frequency analysis and brute force (only 25 meaningful shifts in the Latin alphabet). Vigenere also involves shifting, but it uses a repeating keyword to vary the shift per character (polyalphabetic), whereas the question's phrasing typically points to the fundamental "shift cipher," which is Caesar. SHA-1 is a cryptographic hash function, not a cipher. Bifid is a fractionation cipher combining Polybius square coordinates and transposition, not a direct shifting method. Therefore, the cipher that uses shifting letters of the alphabet for encryption is the Caesar cipher.

質問 # 40
(What is the length (in bits) of a SHA-1 hash output?)

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

正解：C

解説：
SHA-1 (Secure Hash Algorithm 1) produces a fixed-size output of 160 bits (20 bytes). Hash output size matters in cryptography because it influences collision resistance and the effort required for various attacks. For an ideal n-bit hash, finding a collision by generic means is expected around 2

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