Cryptography and Network Security

The Slapper worm/Trojan targets Apache web servers running SSL, utilizing port 443 (HTTPS) to exploit a vulnerability in OpenSSL and establish a peer-to-peer DDoS network.

Chode is a well-known Trojan horse written in DOS batch language. It executes malicious commands using standard command-line instructions on Windows/DOS systems.

Wipe is a destructive Trojan horse written in JavaScript that targets Windows systems by deleting files on the hard drive. The other options are written in different languages.

This is a duplicate of question 133767 with identical content. Creeper (1971) is recognized as the first computer virus, running on ARPANET. The duplicate ID suggests a data quality issue that should be flagged.

This scenario describes Cross-Site Scripting (XSS), where malicious script is injected into a trusted site's output and executed in a user's browser under the trusted site's context. SQL Injection involves database manipulation, Session Fixation involves session hijacking, and CSRF involves forced actions.

Session Fixation attacks occur when an attacker sets a user's session ID before authentication, then uses that known session after the user logs in. Phishing and injection are different attack vectors.

A Denial of Service (DoS) attack aims to make a service unavailable by overwhelming it with traffic or exploiting vulnerabilities, causing delays, losses, and interruptions. This directly impacts availability as described. Eavesdropping, path traversal, and URL tampering focus on data theft or unauthorized access rather than service degradation.

A Trojan horse is malicious code disguised as legitimate software - it can be injected into benign applications, delivered via email links, or hidden in JavaScript for covert attacks. Spyware monitors activity without masquerading, MITM intercepts communications, and HTTP smuggling exploits request parsing vulnerabilities.

Network eavesdropping (also called sniffing) involves capturing packets from the network to read sensitive data like passwords and tokens. MITM is an active attack that intercepts and potentially modifies communications. Page hijacking and path manipulation are different attack types.

The US military uses AES-192 or higher (typically AES-256) for classified information. While AES-256 is more common, AES-192 meets the minimum military standard requirements. DES is an older, weaker standard, and 'Serpant' (likely 'Serpent') is not the official standard.

Public key cryptography emerged in the 1970s, with the groundbreaking Diffie-Hellman key exchange published in 1976 and the RSA algorithm developed in 1977. This revolutionized secure communication without requiring pre-shared secret keys.

A qubit (quantum bit) is the fundamental unit of quantum information. Unlike a classical bit that carries information as voltage levels in a circuit, a qubit can be implemented using various quantum systems including photons, which are particles of light.

Quantum cryptography relies on the transmission of individual light particles, or photons. A 'photon gun' (or single-photon source) is a fundamental physical requirement to generate and emit these individual photons for secure quantum key distribution.

A person who specializes in analyzing and breaking cryptographic systems, ciphers, and encrypted text without knowing the key is called a cryptanalyst. While 'hacker' or 'decoder' are informal terms, 'cryptanalyst' is the precise scientific and professional designation.

The National Institute of Standards and Technology (NIST) utilizes infrared lasers to generate single photons for quantum key distribution and encryption systems. Other options like ruby crystal or silicon diode lasers are not the primary sources used for these specific quantum systems.

Blowfish encryption consists of two main components: key expansion (generating subkeys from the encryption key through the Feistel network) and data encryption (the actual encryption process using round keys). These two parts work together - key expansion prepares the cryptographic material, then data encryption applies it to transform plaintext.