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| Section | Weight | Objectives |
|---|---|---|
| Implementation & Best Practices | 5% | - Common mistakes and vulnerabilities - Standards and compliance - Selecting appropriate algorithms and key sizes |
| Hash Functions & Data Integrity | 15% | - HMAC construction and application - Properties: collision resistance, one-way function - Algorithms: SHA-1, SHA-256, SHA-3, MD5 - Uses: integrity checks, password storage, message authentication |
| Key Management & Secure Protocols | 10% | - Secure protocols: TLS/SSL, IPsec, SSH, PGP - Key generation, storage, exchange, and destruction - Cryptographic attacks: brute force, birthday, man-in-the-middle |
| Asymmetric Encryption & Public Key Infrastructure | 25% | - Digital signatures: purpose and process - Algorithms: RSA, ECC, Diffie-Hellman - Principles: public/private key pairs - PKI components: certificates, CAs, trust models - Certificate lifecycle: creation, validation, revocation |
| Symmetric Encryption | 25% | - Key generation, distribution, and management challenges - Principles and operation - Algorithms: AES, DES, 3DES, Blowfish - Block vs stream ciphers, modes of operation (ECB, CBC, OFB, CFB) |
| Cryptography Fundamentals | 20% | - Basic terminology: plaintext, ciphertext, algorithm, key - Historical evolution and modern applications - Core goals: confidentiality, integrity, authentication, non-repudiation |
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NEW QUESTION # 63
(What type of encryption uses different keys to encrypt and decrypt the message?)
Answer: D
Explanation:
Asymmetric encryption (also called public key cryptography) uses a pair of mathematically related keys: a public key and a private key. One key is used to encrypt, and the other is used to decrypt, which is the defining "different keys" property asked in the question. In the common confidentiality use case, a sender encrypts a message using the recipient's public key, and only the recipient can decrypt it using their private key. This solves the key distribution problem inherent in symmetric encryption, where both parties must securely share the same secret key in advance. Asymmetric systems also enable digital signatures: the private key signs (creates a signature) and the public key verifies it, providing authenticity and integrity. Symmetric encryption, by contrast, uses the same shared key for both encryption and decryption (even though internal round keys may exist, it is still one shared secret). "Private key" alone is not a full encryption type, and
"secure" is a generic description rather than a cryptographic category. Therefore, the correct answer is D.
Asymmetric.
NEW QUESTION # 64
(Which cryptographic operation uses a single key?)
Answer: B
Explanation:
Symmetric cryptography uses a single shared secret key for both encryption and decryption. This contrasts with asymmetric cryptography, which uses a key pair (public/private). Symmetric algorithms (like AES, ChaCha20) are efficient and well-suited for bulk data encryption, but they require a secure method for key distribution because both parties must possess the same secret. Hashing is not a keyed operation by default (though HMAC is keyed); it maps arbitrary data to a fixed-size digest and is primarily used for integrity checking, fingerprints, and password hashing constructions. Padding is a data formatting technique (e.g., PKCS#7) used to align plaintext to a block size; it is not a cryptographic "operation" that uses a key. Therefore, the cryptographic operation characterized by using one key shared between parties is symmetric encryption. In real systems, symmetric encryption is frequently combined with asymmetric methods for key exchange and with MACs/AEAD for integrity, producing the standard hybrid approach used in protocols like TLS and IPsec.
NEW QUESTION # 65
(What is the length (in bits) of a SHA-1 hash output?)
Answer: A
Explanation:
SHA-1 (Secure Hash Algorithm 1) produces a fixed-size output of 160 bits (20 bytes). Hash output size matters in cryptography because it influences collision resistance and the effort required for various attacks. For an ideal n-bit hash, finding a collision by generic means is expected around 2
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