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| Section | Objectives |
|---|---|
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards |
| Cryptography Fundamentals | - Symmetric vs Asymmetric Encryption - History and Evolution of Cryptography - Cryptographic Terminology |
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Common Attack Vectors - Social Engineering Prevention |
| Asymmetric Cryptography | - RSA Algorithm - Public Key Infrastructure (PKI) - Elliptic Curve Cryptography (ECC) - Diffie-Hellman Key Exchange |
| Applied Cryptography | - Cryptographic Best Practices - VPN Security - SSL/TLS Protocols - PGP and Email Encryption |
| Symmetric Cryptography | - Key Management - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) - Stream Ciphers |
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NEW QUESTION # 28
(Which symmetric encryption technique uses a 112-bit key size and a 64-bit block size?)
Answer: C
Explanation:
3DES (Triple DES) is a symmetric block cipher that retains DES's 64-bit block size while increasing effective security by applying DES multiple times. The common "two-key 3DES" variant uses two independent 56-bit DES keys (K1 and K2) in an Encrypt-Decrypt-Encrypt (EDE) sequence: Encrypt with K1, Decrypt with K2, then Encrypt again with K1. Because each DES key is 56 bits (ignoring parity bits), the total keying material is 112 bits. This matches the question's "112-bit key size and 64- bit block size." Plain DES uses only a 56-bit effective key and a 64-bit block size, so it does not match the 112-bit key size. AES has a 128-bit block size and key sizes of 128/192/256. IDEA uses a 64-bit block size but has a 128-bit key. Therefore, the correct algorithm is 3DES. Although 3DES improved on DES, it is now considered legacy due to its small 64-bit block size (birthday-bound issues for large data volumes) and performance overhead compared to AES.
NEW QUESTION # 29
(Which cipher uses shifting letters of the alphabet for encryption?)
Answer: A
Explanation:
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.
NEW QUESTION # 30
(What is the primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) in relation to encryption?)
Answer: D
Explanation:
HIPAA is a U.S. regulation focused on protecting the privacy and security of protected health information (PHI). In relation to encryption, HIPAA's Security Rule requires covered entities and business associates to implement appropriate administrative, physical, and technical safeguards to ensure the confidentiality, integrity, and availability of electronic PHI. Encryption is widely recognized as a key technical safeguard for confidentiality-protecting PHI in transit (e.g., over networks) and at rest (e.g., on storage devices) by making data unreadable without the proper keys. HIPAA does not standardize encryption across all industries, nor does it prohibit electronic health records; it regulates how they must be protected. While HIPAA often uses the term "addressable" for encryption controls (meaning organizations must implement it if reasonable and appropriate, or document an equivalent alternative), the overarching purpose remains protection of patient information through secure measures, with encryption as a central mechanism. Therefore, the best answer is ensuring confidentiality of patient information through secure measures like encryption.
NEW QUESTION # 31
(Why should an asymmetric private key be used to encrypt the digest of an application?)
Answer: A
Explanation:
Digital signing of software typically works by hashing the application (or its manifest) and then using the publisher's private key to create a digital signature over that digest. The private key is used because it is secret and uniquely controlled by the publisher; only the publisher should be able to produce a valid signature. Verifiers (customers) use the publisher's public key to validate the signature and confirm that the digest matches the software they received. This yields two key properties: integrity (the software hasn't been altered; any modification changes the digest and breaks verification) and authenticity (the signature proves it came from the private-key holder). Option A incorrectly describes symmetric stream encryption. Option C incorrectly generalizes private-key behavior as "block encryption." Option D is wrong because verification uses the public key, not a private key; also,
"encrypting with private key" in this context is better understood as signing, not confidentiality encryption. Therefore, the correct rationale is that the asymmetric private key is used to sign the file's digest so the corresponding public key can verify integrity and authenticity.
NEW QUESTION # 32
(What is the relationship between Secure Sockets Layer (SSL) and Transport Layer Security (TLS)?)
Answer: A
Explanation:
TLS is the modern successor to SSL. SSL (notably SSL 2.0 and SSL 3.0) was an early protocol family for securing network communications, providing encryption, integrity, and endpoint authentication for applications like HTTPS. Over time, weaknesses were discovered in SSL's design and in the cryptographic mechanisms commonly used with it. TLS was introduced as an improved, standardized evolution (starting with TLS 1.0, based on SSL 3.0 but with important fixes), and later versions (TLS 1.2 and TLS 1.3) significantly strengthened security by removing weak ciphers, improving key exchange, and tightening handshake and record protections. In practice, when people say "SSL" today, they often mean "TLS," but true SSL is deprecated and should not be used. SSL is not a replacement of TLS, and the two are not identical in security-TLS versions incorporate substantial improvements and modern cryptographic best practices. SSL is also not limited to email; it was widely used for web traffic and other protocols. Therefore, the correct relationship is that TLS replaced SSL to provide improved security.
NEW QUESTION # 33
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