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| Section | Objectives |
|---|---|
| Cryptography Fundamentals | - History and Evolution of Cryptography - Symmetric vs Asymmetric Encryption - Cryptographic Terminology |
| Cryptanalysis and Attacks | - Social Engineering Prevention - Common Attack Vectors - Brute Force and Dictionary Attacks |
| Symmetric Cryptography | - Initialization Vectors (IV) - Stream Ciphers - Key Management - Block Ciphers (AES, DES, 3DES) |
| Applied Cryptography | - Cryptographic Best Practices - PGP and Email Encryption - SSL/TLS Protocols - VPN Security |
| Asymmetric Cryptography | - RSA Algorithm - Elliptic Curve Cryptography (ECC) - Public Key Infrastructure (PKI) - Diffie-Hellman Key Exchange |
| Hashing and Digital Signatures | - Message Authentication Codes (MAC) - Digital Signature Standards - Hash Functions (MD5, SHA-1, SHA-256) |
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NEW QUESTION # 64
(A company wants to use certificates issued by a root CA to demonstrate to customers that it is a legitimate company being hosted by a cloud provider. Who needs to trust the root CA public key?)
Answer: B
Explanation:
In a public key infrastructure, trust in a certificate ultimately depends on the relying party's trust anchor set- typically the root CA certificates preinstalled in a customer's browser/OS trust store. For customers to accept the company's certificate as legitimate, the buyer (customer) must trust the root CA public key (or an intermediate chained to it) so they can validate the certificate chain and signatures. The seller (the company) also must trust and rely on the root CA public key to build and present a valid chain and to make operational decisions based on that CA's issuance and revocation mechanisms; practically, the seller selects a CA whose root is widely trusted by customers. The cloud provider's trust is not what makes the certificate valid to customers; the provider may terminate TLS or pass traffic through, but customer validation is based on the chain to a trusted root. Government agencies like the FTC are not part of the cryptographic trust path for TLS certificate validation. Therefore, among the given options, the correct pairing is the seller and the buyer, reflecting both the issuer selection/usage by the company and the relying-party validation by customers.
NEW QUESTION # 65
(What are the primary characteristics of Bitcoin proof of work?)
Answer: B
Explanation:
Bitcoin's proof of work (PoW) is designed so that finding a valid block is computationally difficult, but checking validity is computationally easy. Miners must repeatedly hash candidate block headers (double SHA-
256) with different nonces until they find a hash value below a network-defined target. This trial-and-error search requires significant work and energy because the probability of success per attempt is extremely low at current difficulty levels. However, verification is straightforward: any node can hash the block header once (or a small number of times) and confirm the resulting hash meets the target threshold and that the block contents follow protocol rules. This "hard to produce, easy to verify" property is essential: it makes it expensive for attackers to rewrite history or outpace honest miners, while allowing all participants-even low- power devices-to validate blocks efficiently. Therefore, the primary characteristic of Bitcoin proof of work is that it is difficult to produce and easy to verify.
NEW QUESTION # 66
(Which mode of encryption uses an Initialization Vector (IV) to encrypt the first block and then uses the result to encrypt the next block?)
Answer: D
Explanation:
CBC mode introduces dependency between blocks to prevent the pattern leakage seen in ECB. It starts with a random (or unpredictable) IV for the first block. Before encrypting block 1, CBC XORs plaintext block 1 with the IV, then encrypts the result. For block 2 and onward, CBC XORs each plaintext block with the previous ciphertext block before encryption. This chaining means that changing one plaintext block affects that block's ciphertext and also influences the next block's computation. The IV ensures that encrypting the same message twice under the same key produces different ciphertexts (assuming a fresh IV). Option A (ECB) has no IV or chaining. OFB and CFB are feedback modes that effectively generate a keystream; they do use an IV, but the "uses the result to encrypt the next block" wording most directly matches CBC's ciphertext-chaining description in standard teaching. CBC still requires integrity protection (e.g., HMAC or an AEAD mode) because it can be malleable without authentication. Therefore, the correct mode is Cipher Block Chaining (CBC).
NEW QUESTION # 67
(Which type of exploit involves looking for different inputs that generate the same hash?)
Answer: C
Explanation:
A birthday attack targets hash functions by exploiting the birthday paradox: collisions (two different inputs producing the same hash output) can be found much faster than brute-forcing a specific preimage. For an n-bit hash, the expected work to findanycollision is on the order of 2
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