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| Section | Objectives |
|---|---|
| Asymmetric Cryptography | - Public Key Infrastructure (PKI) - Diffie-Hellman Key Exchange - RSA Algorithm - Elliptic Curve Cryptography (ECC) |
| Cryptography Fundamentals | - History and Evolution of Cryptography - Cryptographic Terminology - Symmetric vs Asymmetric Encryption |
| Symmetric Cryptography | - Initialization Vectors (IV) - Block Ciphers (AES, DES, 3DES) - Key Management - Stream Ciphers |
| Hashing and Digital Signatures | - Digital Signature Standards - Message Authentication Codes (MAC) - Hash Functions (MD5, SHA-1, SHA-256) |
| Applied Cryptography | - Cryptographic Best Practices - PGP and Email Encryption - VPN Security - SSL/TLS Protocols |
| Cryptanalysis and Attacks | - Brute Force and Dictionary Attacks - Common Attack Vectors - Social Engineering Prevention |
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NEW QUESTION # 20
(Which default port must be allowed by firewalls for the key exchange of the IPsec handshaking process to be successful?)
Answer: A
Explanation:
IPsec's initial key exchange is commonly performed using IKE (Internet Key Exchange), which negotiates Security Associations (SAs), authenticates peers, and establishes shared keys for ESP/AH protection. The traditional and default transport for IKEv1 and IKEv2 is UDP port 500. During negotiation, peers exchange proposals (crypto suites), perform Diffie-Hellman to derive key material, and authenticate using pre-shared keys, certificates, or EAP methods. If a firewall blocks UDP 500, the IKE negotiation cannot begin, preventing IPsec tunnels from forming. In many real deployments, NAT traversal is also used; in that case, traffic typically shifts to UDP 4500 (NAT-T) after detection of NAT, but UDP 500 is still required for the initial exchange and NAT detection in many configurations. TCP
500 is not standard for IKE. Port 443 is associated with HTTPS/TLS and some SSL VPNs, not IPsec IKE. Therefore, among the options provided, the firewall must allow UDP 500 for IPsec key exchange to succeed.
NEW QUESTION # 21
(What is the length (in bits) of a SHA-1 hash output?)
Answer: B
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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