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(Which technique involves spotting variations in encrypted data and plotting how the characters relate to standard English characters?)
A. Frequency analysis
B. Chosen ciphertext
C. Known plaintext
D. Brute force
Answer: A
Explanation:
Frequency analysis is a classical cryptanalysis technique that exploits predictable statistical patterns in natural language. In English, certain letters (like E, T, A, O, I, N) occur more frequently than others, and common digrams/trigrams (TH, HE, IN, ER) appear with recognizable distribution. When a cipher preserves character boundaries (as in many substitution ciphers), the ciphertext will also show frequency patterns-though mapped to different symbols. The analyst counts ciphertext character occurrences, compares the distribution to expected English letter frequencies, and infers likely plaintext mappings. "Spotting variations" refers to observing differences in how often symbols appear and using that to plot relationships between ciphertext and standard English. Brute force instead tries all keys; known-plaintext attacks rely on having plaintext-ciphertext pairs; chosen-ciphertext attacks involve decrypting attacker-selected ciphertexts. Those are different attack models. Frequency analysis is specifically about statistical correlation between ciphertext symbols and language characteristics, which is why it is effective against monoalphabetic substitution and weak polyalphabetic schemes with short periods.
NEW QUESTION # 22
(Which certificate encoding process is binary-based?)
A. Public Key Infrastructure (PKI)
B. Privacy Enhanced Mail (PEM)
C. Distinguished Encoding Rules (DER)
D. Rivest-Shamir-Adleman (RSA)
Answer: C
Explanation:
DER (Distinguished Encoding Rules) is a binary encoding format used to represent ASN.1 structures in a canonical, unambiguous way. X.509 certificates are defined using ASN.1, and DER provides a strict subset of BER (Basic Encoding Rules) that guarantees a single, unique encoding for any given data structure. That "unique encoding" property is important for cryptographic operations such as hashing and digital signatures, because different encodings of the same abstract data could otherwise produce different hashes and break signature verification. In contrast, PEM is not a binary encoding; it is essentially a Base64-encoded text wrapper around DER data, bounded by header/footer lines (e.g.,
"BEGIN CERTIFICATE"). PKI is an overall framework for certificate issuance, trust, and lifecycle management-not an encoding. RSA is an asymmetric algorithm used for encryption/signing, not a certificate encoding format. Therefore, the binary-based certificate encoding process among the options is DER.
NEW QUESTION # 23
(Why should an administrator choose lightweight cryptography?)
A. The data requires minimal protection due to the sensitivity level.
B. The payload requires complex rounds of encryption.
C. The embedded system has limited resources.
D. The desktop is in a secure area of the building.
Answer: C
Explanation:
Lightweight cryptography is designed for constrained environments-devices with limited CPU, memory, storage, bandwidth, and power (battery). Examples include IoT sensors, smart locks, RFID tags, embedded controllers, and industrial devices. Administrators choose lightweight algorithms and protocols to maintain reasonable security while fitting strict resource budgets and real-time constraints.
The goal is not "weaker security because data is unimportant," but rather efficient security that can still meet threat models under constraints. Option B captures this: embedded systems often cannot afford the computational cost of heavy cryptographic primitives (large key sizes, complex modes, frequent handshakes) or may struggle with latency and energy consumption. Option A is irrelevant because physical security of a desktop doesn't remove the need for cryptography in communications or storage. Option C is the opposite of lightweight design. Option D is a poor justification; security design should be based on risk, and lightweight cryptography is not merely for "minimal protection," but for practical deployability under constraints. Therefore, the correct reason is limited resources on embedded systems.
NEW QUESTION # 24
(Which attack maps hashed values to their original input data?)
A. Rainbow table
B. Birthday
C. Dictionary
D. Brute-force
Answer: A
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 # 25
(Which wireless security standard uses an authentication server with 802.1X and EAP?)
A. WPA-Enterprise
B. WPA-PSK
C. TKIP
D. WEP
Answer: A
Explanation:
802.1X is a port-based network access control framework that enables centralized authentication using an authentication server (commonly RADIUS). EAP (Extensible Authentication Protocol) runs within
802.1X to support many credential types (password-based methods like PEAP, certificate-based methods like EAP-TLS, and others). WPA-Enterprise is the wireless security mode that explicitly uses
802.1X + EAP with an authentication server to perform per-user/per-device authentication and to derive dynamic session keys. By contrast, WPA-PSK uses a pre-shared key without an external authentication server; all users share the same PSK, which is weaker for enterprise identity management. WEP is an older mechanism using static keys and does not provide modern 802.1X/EAP enterprise authentication in the WPA-Enterprise sense. TKIP is an encryption/integrity protocol used under WPA, not the full authentication "standard" involving an authentication server. Therefore, the correct choice is WPA-Enterprise.
NEW QUESTION # 26
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