In computer security, what does encryption do?

Encryption plays a crucial role in computer security by transforming data into a coded format, making it unreadable to unauthorized users. This process involves using algorithms and keys to convert plaintext information into ciphertext. Only individuals or systems that possess the correct decryption key can revert this coded data back to its original form, ensuring that even if the data is intercepted during transmission or accessed without permission, it remains protected and unreadable.

This method effectively safeguards sensitive information, such as personal details, financial records, and confidential communication, from potential threats, including hackers and data breaches. In this way, encryption is foundational to privacy and security in digital communications and storage.