Knowledge Base
Elliptic-Curve Parameter
A

w-383-mers

Summary

Name:
w-383-mers
Long Name:
W-383 Mersenne
Key size:
383 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)
0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe5b
Copy to clipboard
Coefficient (a)
0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe58
Copy to clipboard
Coefficient (b)
0x17dbc
Copy to clipboard
Generator (x)
0x3
Copy to clipboard
Generator (y)
0xb4d51a66f4444e332907a1132068565b5eee080440984d988e938e579e299f6b590382ee95bde62d4784c55b9cfda3c
Copy to clipboard
Order (n)
0x7fffffffffffffffffffffffffffffffffffffffffffffffa9caf814a8a116ad9fb0b4035417aaf319297fc0bb7a439f
Copy to clipboard
Cofactor (h)
0x1
Copy to clipboard

Representations

PEM

-----BEGIN EC PARAMETERS-----
MIIBPgIBATA7BgcqhkjOPQEBAjB/////////////////////////////////////
/////////////////////////lswZAQwf///////////////////////////////
//////////////////////////////5YBDAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABfbwEYQQAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMLTVGmb0RE4zKQehEyBoVlte7g
gEQJhNmI6TjleeKZ9rWQOC7pW95i1HhMVbnP2jwCMH//////////////////////
/////////6nK+BSooRatn7C0A1QXqvMZKX/Au3pDnwIBAQ==
-----END EC PARAMETERS-----
Download ecparam.pem
Copy to clipboard

PARI/GP

p = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe5b;
a = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe58;
b = 0x17dbc;
E = ellinit([a, b], p);
G = [0x3, 0xb4d51a66f4444e332907a1132068565b5eee080440984d988e938e579e299f6b590382ee95bde62d4784c55b9cfda3c];
n = 0x7fffffffffffffffffffffffffffffffffffffffffffffffa9caf814a8a116ad9fb0b4035417aaf319297fc0bb7a439f;
h = 0x1;
Copy to clipboard

LaTeX

$\begin{aligned}
y^2 &\equiv x^3 + a x + b \pmod{p} \\
p &= 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe5b \\
a &= 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe58 \\
b &= 0x17dbc \\
G &= (0x3, 0xb4d51a66f4444e332907a1132068565b5eee080440984d988e938e579e299f6b590382ee95bde62d4784c55b9cfda3c) \\
n &= 0x7fffffffffffffffffffffffffffffffffffffffffffffffa9caf814a8a116ad9fb0b4035417aaf319297fc0bb7a439f \\
h &= 0x1
\end{aligned}$
Copy to clipboard