🔐 EC Key Generator

Generate Elliptic Curve (EC) cryptographic key pairs for modern SSL/TLS certificates, ECDSA digital signatures, and secure communications.

📌 Generated EC Private Key (P-256):
Generating key...
📘 What is an EC Key used for?
  • SSL/TLS Certificates: Used in HTTPS to secure websites with smaller, faster keys compared to RSA.
  • Digital Signatures: EC keys are used to sign JWT tokens, code, and documents using ECDSA.
  • SSH Authentication: Common in modern SSH setups (e.g., ecdsa, ed25519) for logging into servers.
  • Mobile & IoT Devices: Ideal for devices with limited CPU/battery due to efficiency.
  • Blockchain & Crypto: Cryptocurrencies like Bitcoin and Ethereum use EC keys (e.g., secp256k1).
  • Zero-Knowledge Systems: Power advanced cryptography like zk-SNARKs and private coins (e.g., Monero).
⚙️ EC vs RSA Comparison:
Feature EC (Elliptic Curve) RSA
Key Size Smaller (256-bit) Larger (2048+ bit)
Performance Faster Slower
Security per Bit Higher Lower
Mobile Friendly ✅ Yes ❌ Less ideal
Bandwidth Usage Lower Higher
⚠️ Important: Keep your private key secure and never share it. This tool generates keys locally in your browser. Always store private keys in a secure location.

What the button does

This one really does generate a key in your browser, with no server involved. It calls the WebCrypto API for an ECDSA key pair on curve P-256 - the curve OpenSSL calls prime256v1 and standards call secp256r1 - marks it extractable, exports the private half as PKCS#8 DER, base64-encodes that and breaks it into 64-character lines between PRIVATE KEY markers. A new pair is made on load and on every click, and nothing is stored. Only the private key is shown; the public point sits inside it and can be derived at any time.

Do not use this key for a production certificate. The randomness is fine, coming from the operating system, but the key is then plain text in a page that also loads jQuery and analytics from third-party CDNs, is readable by any extension with page access, and reaches you through the clipboard rather than a file with 0600 permissions. Real keys are generated on the machine that will use them and never travel.

PEM, DER, PKCS#8 and SEC1

DER is the raw binary encoding; PEM is that same binary in base64 with header lines. PKCS#8 is the generic private-key container used here, labelled BEGIN PRIVATE KEY and carrying an algorithm identifier. The older EC-specific SEC1 form is labelled BEGIN EC PRIVATE KEY. Some tooling wants one and not the other:

openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 -out ec.key
openssl pkey -in ec.key -noout -text     # inspect, confirm the curve
openssl pkey -in ec.key -pubout -out ec.pub
openssl pkcs8 -topk8 -nocrypt -in sec1.key -out pkcs8.key

Frequently asked questions

What is the difference between BEGIN PRIVATE KEY and BEGIN EC PRIVATE KEY?

The first is PKCS#8, which names the algorithm inside the structure. The second is SEC1, an elliptic-curve-only format. Both hold the same secret; convert with openssl pkcs8 -topk8 in one direction, openssl ec in the other.

Is P-256 stronger than RSA 2048?

Slightly. P-256 gives roughly 128 bits of security, against about 112 for RSA 2048, and matches RSA 3072 - with a 32-byte key instead of a 256-byte modulus, which is why handshakes are faster.

Can I get a secp256k1 key from this page?

No. It is fixed to P-256, and WebCrypto does not offer the Bitcoin curve. For secp256k1 use openssl ecparam -name secp256k1 -genkey -noout.