A customer is unable to open some files on their system. Each time the customer attempts to open a file, the customer receives a message that the file is encrypted. Which of the following best describes this issue?

A keylogger is a type of malware designed to record keystrokes made by a user, often to capture sensitive information such as passwords or credit card numbers. While it poses a significant security risk, it does not encrypt files or prevent access to them, which makes it an incorrect choice in this scenario.

Phishing refers to fraudulent attempts to obtain sensitive information by disguising as a trustworthy entity in electronic communication. Although phishing can lead to malware infections, it does not directly cause file encryption or prevent file access, making it an inaccurate description of the customer's problem.

A cryptominer is a type of malware that uses a victim's computing resources to mine cryptocurrency without their consent. While it can slow down system performance or cause other issues, it does not encrypt files, and therefore is not related to the encryption message the customer is encountering.