What does data encryption primarily achieve?

Data encryption primarily achieves the prevention of unauthorized access to sensitive information. By converting data into a code that can only be deciphered by someone with the correct decryption key or method, encryption ensures that even if data is intercepted or accessed by unauthorized users, it remains unreadable and secure. This is crucial for protecting personal, financial, and confidential information, thereby maintaining privacy and security in digital communications.

The other options do not accurately capture the main purpose of data encryption. While increasing data complexity might occur as a by-product of the encryption process, it is not the goal of encryption. Encryption does not inherently accelerate data transfer rates; in fact, it may add some delay due to the processing involved in encoding and decoding data. Additionally, while encryption can help secure data organization by protecting the integrity and confidentiality of structured information, improving data organization is not a direct outcome of the encryption process.