What is a 'trojan horse' in the context of cybersecurity?

• A. A hardware component used for encryption
• B. A type of malware that disguises itself as legitimate software to gain unauthorized access
• C. A method for securely transferring files
• D. A network device that prevents unauthorized access

Answer: (B)

In the context of cybersecurity, a 'trojan horse' refers to a type of malware that disguises itself as legitimate software to deceive users into installing it on their systems. This method of attack leverages social engineering techniques, where attackers create a seemingly harmless application or file that, once executed, can compromise the system.

Once installed, the trojan horse can perform various malicious actions, such as stealing sensitive information, creating backdoors for further attacks, or giving unauthorized remote access to the attacker. The name 'trojan horse' draws its origin from the ancient Greek legend, where Greek soldiers hid inside a wooden horse to infiltrate the city of Troy, symbolizing how this type of malware can infiltrate systems under the guise of something benign.

Understanding this concept is crucial for recognizing the risks associated with downloading and executing software from untrusted sources, as well as implementing effective security measures to protect against such threats.