What is the primary purpose for using an encryption algorithm on a message?

Authentication verifies identity and is achieved through mechanisms like digital signatures or certificates, not encryption alone.

Confidentiality is the core goal of encryption - it transforms plaintext into an unreadable form so that unauthorized parties cannot access the original message content. Encryption algorithms use keys to scramble data, ensuring only parties with the correct decryption key can recover the original plaintext.

Availability refers to ensuring systems and data are accessible when needed, which is addressed by redundancy and uptime strategies, not encryption.

Integrity ensures data has not been altered in transit and is typically achieved using hashing or MACs, not encryption algorithms.