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| Section | Objectives |
|---|---|
| Topic 1: Cryptanalysis and Attacks | - Social Engineering Prevention - Brute Force and Dictionary Attacks - Common Attack Vectors |
| Topic 2: Asymmetric Cryptography | - RSA Algorithm - Diffie-Hellman Key Exchange - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) |
| Topic 3: Cryptography Fundamentals | - Symmetric vs Asymmetric Encryption - Cryptographic Terminology - History and Evolution of Cryptography |
| Topic 4: Applied Cryptography | - Cryptographic Best Practices - PGP and Email Encryption - VPN Security - SSL/TLS Protocols |
| Topic 5: Symmetric Cryptography | - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) - Key Management - Stream Ciphers |
| Topic 6: Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) - Digital Signature Standards |
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NEW QUESTION # 42
(What is used to randomize the initial value when generating Initialization Vectors (IVs)?)
Answer: C
Explanation:
An IV (Initialization Vector) is a value used to ensure that encrypting identical plaintext under the same key produces different ciphertexts, preventing pattern leakage. In many secure designs, the IV must be unique (and often unpredictable) per encryption operation. A common way to ensure uniqueness is to incorporate a nonce-a "number used once." A nonce can be random, pseudo-random, or a counter-based value depending on the mode and security requirements. For example, CTR mode uses a nonce combined with a counter to produce unique input blocks; GCM uses a nonce/IV to ensure unique authentication and encryption behavior.
The encryption key should remain stable across many operations and should not be used as the "randomizer" for IV generation; mixing key material into IV creation in an ad hoc way can create reuse or correlation issues. Plaintext and algorithm do not provide the needed uniqueness property. The nonce concept is specifically about ensuring one-time uniqueness of the starting value so that IV reuse does not repeat keystream blocks (stream modes) or reveal plaintext equality (CBC/CTR). Therefore, the correct choice is Nonce.
NEW QUESTION # 43
(Which authentication method allows a customer to authenticate to a web service?)
Answer: A
Explanation:
One-way client authentication is the method where the client (customer) proves its identity to the server (web service). In cryptographic terms, this is commonly implemented through client credentials such as client TLS certificates (mTLS from the server's perspective) or through authentication protocols layered over TLS (for example, signed tokens), but the defining direction is that the client is the party being authenticated. In a strict TLS certificate-authentication framing, client authentication occurs when the server requests a client certificate during the handshake and the client demonstrates possession of the corresponding private key (via signature in handshake messages). The server then validates the client certificate chain and authorization policy. One-way server authentication, by contrast, authenticates only the server to the client and does not identify the customer. Mutual authentication authenticates both sides simultaneously; while it includes client authentication, it is broader than what the question asks. "End-to-end authentication" describes assurance between endpoints across intermediaries, but it is not the specific "customer authenticates to service" method in certificate-based terminology. Therefore, the best answer is one-way client authentication.
NEW QUESTION # 44
(What is an attribute of RC4 when used with WEP?)
Answer: C
Explanation:
In classic WEP deployments, RC4 was used with what is commonly called "40-bit WEP" (also labeled
"64-bit WEP" because it combines a 40-bit secret key with a 24-bit IV to form a 64-bit RC4 seed). The key attribute emphasized in many foundational descriptions of WEP is this 40-bit shared secret length, which was originally chosen due to export restrictions and legacy constraints. Although "104-bit WEP" (sometimes called "128-bit WEP," again counting the 24-bit IV) also existed, the option set here points to the historically standard and widely referenced attribute: a 40-bit key when RC4 is used in WEP.
Importantly, WEP's security failure is not only about key size; the 24-bit IV is too small and repeats frequently, and WEP's key scheduling vulnerabilities combined with IV reuse allow attackers to recover the secret key with enough captured frames. Still, among the given options, the correct attribute is the 40-bit key.
NEW QUESTION # 45
(What is a digital signature?)
Answer: A
Explanation:
A digital signature is a cryptographic mechanism that enables a recipient to verify who created a message (authenticity) and that the message has not been altered (integrity). It is typically built using asymmetric cryptography: the signer uses a private key to sign a hash (digest) of the message, producing a signature.
Anyone with the signer's public key can verify that the signature matches the message digest, confirming the signature was created by the corresponding private key and that the content remains unchanged. Digital signatures do not primarily provide confidentiality; the signed message may still be readable unless separately encrypted. They also support nonrepudiation in many operational contexts because a valid signature can be strong evidence that the private key holder authorized the signed data, assuming key protection and policy controls. Common digital signature algorithms include RSA-PSS, ECDSA, and EdDSA. Certificates (X.509) are often used to bind public keys to identities, allowing verifiers to trust the claimed signer. Therefore, the best definition is a technique to verify authenticity and integrity.
NEW QUESTION # 46
(What is the maximum key size (in bits) supported by AES?)
Answer: B
Explanation:
AES supports three standardized key sizes: 128, 192, and 256 bits, with a fixed block size of 128 bits.
The maximum of these supported key sizes is 256 bits (AES-256). Key size affects resistance to brute- force key search: larger keys exponentially increase the search space. In practice, AES-128 is already considered strong against brute force with contemporary computing capabilities, while AES-256 is often chosen for compliance requirements, conservative security margins, or to hedge against future advances. AES-512 is not part of the AES standard; if 512-bit keys are desired, systems typically use different constructions (like using AES-256 in certain key-derivation or wrapping schemes) rather than changing AES itself. Therefore, the correct maximum supported AES key size is 256 bits.
NEW QUESTION # 47
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