Knowledge Base
Elliptic-Curve Parameter
A

sm2p256v1

Summary

Name:
sm2p256v1
Long Name:
sm2p256v1 elliptic curve (256-bit prime field)
Key size:
256 bits
Object identifier:
1.2.156.10197.1.301
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)
0xfffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff
Copy to clipboard
Coefficient (a)
0xfffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc
Copy to clipboard
Coefficient (b)
0x28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93
Copy to clipboard
Generator (x)
0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7
Copy to clipboard
Generator (y)
0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0
Copy to clipboard
Order (n)
0xfffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123
Copy to clipboard
Cofactor (h)
0x1
Copy to clipboard

Representations

PEM

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

PARI/GP

p = 0xfffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff;
a = 0xfffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc;
b = 0x28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93;
E = ellinit([a, b], p);
G = [0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7, 0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0];
n = 0xfffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123;
h = 0x1;
Copy to clipboard

LaTeX

$\begin{aligned}
y^2 &\equiv x^3 + a x + b \pmod{p} \\
p &= 0xfffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff \\
a &= 0xfffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc \\
b &= 0x28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93 \\
G &= (0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7, 0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0) \\
n &= 0xfffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123 \\
h &= 0x1
\end{aligned}$
Copy to clipboard