Module 6 · Asymmetric Cryptography

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
Apr 27, 2026
1 min read
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Last updated: April 29, 2026

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Asymmetric (public-key) crypto for digital signatures and key exchange.

Asymmetric (public-key) crypto for digital signatures and key exchange.

The choices

  • RSA-2048 — minimum acceptable; phasing out for 4096 in regulated
  • RSA-4096 — slow; use only when compatibility requires
  • ECDSA P-256 — fast; smaller keys (256-bit ~ RSA-3072 strength)
  • Ed25519 — modern; fast; safer-by-default than ECDSA
  • X25519 — for ECDH key agreement
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