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Installing an unwanted software without the knowledge of the user of the computer and stealing internet usage data and other sensitive information is known as- 
1. Ransomware
2. Spyware
3. Trojan
4. Key logger

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Correct Answer - Option 2 : Spyware

The correct answer is Spyware.

  • Spyware
    • Spyware is an unwanted software that infiltrates your computing device and steals your internet usage data and sensitive information.
    • Spyware describes software with malicious behavior that aims to gather information about a person or organization and send such information to another entity in a way that harms the user.
    • Websites may engage in spyware behaviors like web tracking.
    • Some types of spyware can install additional software and change the settings on your device so it's important to use secure passwords and keep your devices updated.

  • Ransomware
    • Ransomware is a form of malware that encrypts a victim's files.
    • It encrypts the victim's files, making them inaccessible, and demands a ransom payment to decrypt them.
    • Ransomware attacks are typically carried out using a Trojan disguised as a legitimate file that the user is tricked into downloading or opening when it arrives as an email attachment.
    • Ransomware is considered "scareware" as it forces users to pay a fee (or ransom) by scaring or intimidating them.
  • Trojan
    • A trojan is any malware that misleads users of its true intent.
    • A trojan is generally spread by some form of social engineering.
    • Trojans may allow an attacker to access a user's personal identity.
    • It can also delete user's files or infect other devices connected to the network.
  • Key logger
    • A software-based keylogger is a computer program designed to record any input from the keyboard.
    • Key loggers are used in IT organizations to troubleshoot technical problems with computers and business networks.
    • Individuals can use malicious keyloggers on public computers to steal passwords or credit card information.
    • Most key loggers are not stopped by HTTPS encryption because it only protects data in transit between computers.

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