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| Section | Objectives |
|---|---|
| Hashing and Digital Signatures | - Digital Signature Standards - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) |
| Cryptography Fundamentals | - Cryptographic Terminology - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography |
| Applied Cryptography | - SSL/TLS Protocols - Cryptographic Best Practices - VPN Security - PGP and Email Encryption |
| Symmetric Cryptography | - Key Management - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) - Stream Ciphers |
| Cryptanalysis and Attacks | - Social Engineering Prevention - Common Attack Vectors - Brute Force and Dictionary Attacks |
| Asymmetric Cryptography | - RSA Algorithm - Diffie-Hellman Key Exchange - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) |
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NEW QUESTION # 60
(Which authentication method allows a web service installed on a network operating system to prove its identity to a customer?)
Answer: D
Explanation:
One-way server authentication is the standard model used by most TLS-enabled web services to prove the server's identity to a client. In this model, the server presents an X.509 certificate during the TLS handshake. The client validates the certificate chain to a trusted root CA, checks hostname binding (CN
/SAN), validates validity dates, and may check revocation status. If validation succeeds, the client gains cryptographic assurance that it is communicating with the holder of the private key corresponding to the server certificate's public key, and that the certificate is issued to the expected domain/identity. This proves the server's identity to the customer without requiring the customer to present a certificate.
Mutual authentication would require both client and server to authenticate each other using certificates (commonly in certain enterprise APIs), but the question asks specifically about the web service proving its identity to the customer, which is satisfied by server-only authentication. One-way client authentication is the opposite direction (client proves identity to server). "End-to-end authentication" is a broader concept and not the specific TLS identity proof mechanism described here. Thus, one-way server authentication is the correct choice.
NEW QUESTION # 61
(What is lattice-based cryptography?)
Answer: B
Explanation:
Lattice-based cryptography refers to cryptographic constructions whose security is based on the computational hardness of problems on mathematical lattices (regular grids of points in high-dimensional space). Examples of hard lattice problems include the Shortest Vector Problem (SVP) and Closest Vector Problem (CVP), and practical schemes often use related problems like Learning With Errors (LWE) or Ring- LWE. These problems are believed to remain hard even for quantum computers, making lattice-based cryptography a major candidate family for post-quantum cryptography. Lattice schemes can support encryption, digital signatures, and key exchange, often with strong security reductions (worst-case to average- case) and efficient implementations. The word "lattice" here is not about simple point encoding; it's about relying on geometric/algebraic structures and noise-based hardness assumptions. It is also unrelated to blockchain "options." While many lattice schemes do involve modular arithmetic internally, what defines the category is the underlying lattice hardness assumptions, not modular arithmetic alone. Therefore, the correct definition is a cryptographic scheme based on geometric lattices.
NEW QUESTION # 62
(Why should a forensic investigator create a hash of a victim's hard drive and of the bitstream copy of the hard drive?)
Answer: D
Explanation:
In digital forensics, investigators must preserve evidence integrity and demonstrate an unbroken chain of custody. Creating a cryptographic hash (such as SHA-256) of the original drive and then hashing the forensic bitstream image provides a strong mathematical assurance that the copy is an exact, bit-for-bit replica.
Because secure hash functions are designed so that any tiny change in data produces a dramatically different digest, matching hashes indicate the image contains identical data to the source at the time of acquisition. This is critical in legal and investigative contexts: analysis is performed on the copy, not the original, to avoid altering evidence. If the hashes match, the investigator can testify that the evidence examined is identical to what was collected, supporting admissibility and credibility. Hashing does not prove who created files, nor does it directly show whether someone "opened the drive"; it specifically validates the integrity and equivalence of the captured image. Therefore, hashing both artifacts is done to verify that the original and the bitstream copy are identical.
NEW QUESTION # 63
(How does a Caesar cipher operate in the encryption of messages?)
Answer: A
Explanation:
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.
NEW QUESTION # 64
(Which attack maps hashed values to their original input data?)
Answer: C
Explanation:
A rainbow table attack uses large, precomputed tables that link hash outputs back to likely original inputs (typically passwords). Instead of storing every password#hash pair directly (which would be huge), rainbow tables store chains created by alternating hash operations with reduction functions, allowing attackers to reconstruct candidate plaintexts that produce a given hash. This makes cracking fast,ifthe target hashes are unsalted and use a known, fast hash function. Salt defeats rainbow tables because the attacker would need separate tables for each salt value, which becomes infeasible when salts are unique and sufficiently large. A dictionary attack is related but typically computes hashes on the fly from a wordlist rather than using precomputed chain structures. A birthday attack targets collisions, not mapping to original data. Brute-force tries all candidates without precomputation.
Because the question explicitly describes mapping hashed values back to original data via a precomputed approach, the correct choice is Rainbow table.
NEW QUESTION # 65
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