CompTIA Security+ Encryption Algorithms: Symmetric vs Asymmetric Explained

The current Security+ certification is not a generic "cyber" badge. CompTIA frames SY0-701 around five weighted domains, hands-on performance-based work, and a fixed exam window of 90 minutes. The voucher price is $425, the exam can include maximum of 90 questions, and the passing score is 750 on a scale of 100-900.

Symmetric encryption

Symmetric encryption uses the same key for encryption and decryption. AES (Advanced Encryption Standard) is the primary symmetric algorithm on Security+. AES-128, AES-192, and AES-256 are the key sizes — longer keys provide stronger security. Symmetric encryption is faster and more efficient for bulk data than asymmetric, making it the choice for encrypting large files and disk volumes.

Asymmetric encryption

Asymmetric encryption uses a public key for encryption and a private key for decryption (or vice versa for signatures). RSA and ECC (Elliptic Curve Cryptography) are the primary asymmetric algorithms on Security+. Asymmetric encryption is slower but solves the key distribution problem — you can share your public key freely. It is used for key exchange, digital signatures, and certificate-based trust.

How they work together

TLS (used in HTTPS) combines both: asymmetric cryptography establishes a shared secret during the handshake, and symmetric encryption is used for the actual data transfer. This is why the distinction matters — understanding the hybrid model is more useful than knowing either algorithm in isolation.

What should you do with this information next?

Our CompTIA Security+ study guide covers all five SY0-701 domains. Available at securitypluscertprep.com/guide.

SimpuTech's Security+ AI tutor can build a personalized study plan. Try it at SimpuTech.com.