Knowledge Base
Elliptic-Curve Parameter
A

w-511-mers

Summary

Name:
w-511-mers
Long Name:
W-511 Mersenne
Key size:
511 bits
Publishers:

Check your host!

Type a URL to analyze a service

Get a prompt and clear overview of your security configuration. Right now!

Security

A+
Key Size
Security

The elliptic-curve cryptography[118][119][120][121] is an approach to public-key cryptography[164][165][166] based on the elliptic curve[116][117]s. The most important property in terms of encryption strength, beyond the designer is elliptic curve key size[292][293][294]. All the key sizes available are considered secure, so there is no consideration about it.

A+
Trusted Design
Security

The elliptic-curve cryptography[118][119][120][121] is an approach to public-key cryptography[164][165][166] based on the elliptic curve[116][117]s. Note that there is controversy[287][288][289][290][291] around some of the National Institute of Standards and Technology[470][471] designed elliptic curveselliptic curves designed by NIST[285][286]. This elliptic curve designed by independent researcher[284] Daniel J. Bernstein[476][477] and there is no evidence for any compromise.

Recommendations

Add at least one elliptic curve to the list of elliptic curves supported by your server designed by independent researchers and prefer them as server configuration makes it possible.

A
Post-Quantum
Security

The elliptic curve[116][117] cryptography provides no protection against a cryptanalytic attack by a quantum computer, and no classical elliptic curve does — just as classical Diffie-Hellman does not — because a quantum computer breaks the hardness assumption they rely on. Only a hybrid key exchange (a classical algorithm combined with a post-quantum cryptography[158][159] one) or a pure post-quantum algorithm is quantum-safe.

Recommendations

Enable a hybrid key exchange or a pure post-quantum algorithm on your server, and prefer it where the configuration allows, so the connection stays secure against a future quantum computer.

Parameter Numbers

Prime (p)
0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f
Copy to clipboard
Coefficient (a)
0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c
Copy to clipboard
Coefficient (b)
0x879da
Copy to clipboard
Generator (x)
0x3
Copy to clipboard
Generator (y)
0x219236ae8b4c60e19dd0d9a5f5a6d6581667e9fec9004194430b7cf1fcce25364e5d8a9b0678c099531ed564a3c9d81a53b9906dfc65035251fe1d79e5d1da06
Copy to clipboard
Order (n)
0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f
Copy to clipboard
Cofactor (h)
0x1
Copy to clipboard

Representations

PEM

-----BEGIN EC PARAMETERS-----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-----END EC PARAMETERS-----
Download ecparam.pem
Copy to clipboard

PARI/GP

p = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f;
a = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c;
b = 0x879da;
E = ellinit([a, b], p);
G = [0x3, 0x219236ae8b4c60e19dd0d9a5f5a6d6581667e9fec9004194430b7cf1fcce25364e5d8a9b0678c099531ed564a3c9d81a53b9906dfc65035251fe1d79e5d1da06];
n = 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f;
h = 0x1;
Copy to clipboard

LaTeX

$\begin{aligned}
y^2 &\equiv x^3 + a x + b \pmod{p} \\
p &= 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f \\
a &= 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c \\
b &= 0x879da \\
G &= (0x3, 0x219236ae8b4c60e19dd0d9a5f5a6d6581667e9fec9004194430b7cf1fcce25364e5d8a9b0678c099531ed564a3c9d81a53b9906dfc65035251fe1d79e5d1da06) \\
n &= 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f \\
h &= 0x1
\end{aligned}$
Copy to clipboard