Darren Chaker Explores Encryption Algorithms

Which Encryption Algorithm Should You Use?

Choosing an encryption algorithm depends on your threat model, performance requirements, and whether you need symmetric or asymmetric encryption. There is no single best algorithm for every use case, but there are clear leaders in each category. Here is what I recommend based on years of working with encryption in counter-forensics and digital privacy consulting.

How Do the Major Algorithms Compare?

Algorithm	Type	Key Size	Speed	Best For
AES-256	Symmetric	256-bit	Fast	Disk encryption, file encryption, VPNs
ChaCha20	Symmetric	256-bit	Very fast on mobile	TLS, mobile devices, software encryption
RSA-4096	Asymmetric	4096-bit	Slow	Key exchange, digital signatures
Ed25519	Asymmetric	256-bit	Fast	SSH keys, digital signatures
XChaCha20-Poly1305	AEAD	256-bit	Very fast	Authenticated encryption with large nonces

What Makes AES-256 the Gold Standard?

AES-256 has withstood over two decades of cryptanalysis with no practical attacks discovered. It is the algorithm behind BitLocker, VeraCrypt, and virtually every serious encryption product. The 256-bit key space means a brute-force attack would require more energy than exists in the observable universe. When I configure whole disk encryption for clients, AES-256 in XTS mode is the default recommendation.

What About Post-Quantum Encryption?

Quantum computers threaten current asymmetric algorithms like RSA and elliptic curve cryptography. NIST finalized its first post-quantum cryptographic standards in 2024, selecting ML-KEM (formerly CRYSTALS-Kyber) for key encapsulation and ML-DSA (formerly CRYSTALS-Dilithium) for digital signatures.

Symmetric algorithms like AES-256 are already considered quantum-resistant because Grover's algorithm only halves the effective key length, meaning AES-256 provides 128-bit security against quantum attacks, which remains sufficient.

Practical Steps for Encryption Hygiene

1. Use AES-256 or ChaCha20 for symmetric encryption depending on your hardware
2. Migrate SSH keys to Ed25519 if you are still using RSA-2048
3. Enable TLS 1.3 on all web servers which mandates modern cipher suites
4. Monitor NIST post-quantum standards and begin testing ML-KEM implementations
5. Never roll your own cryptography because implementation errors are far more common than algorithm weaknesses

Encryption is only as strong as its implementation. Choose established algorithms, use vetted libraries, and keep your systems updated.

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Darren Chaker is a cybersecurity consultant specializing in encryption and counter-forensics, based in Santa Monica, California. Learn more at about.me/darrenchakerprivacy.