Elliptic Curve Encryption/Decryption Choose ECParam Generate EC
Encrypt/Decrypt Encrypt Message Decrypt Message
Public Key Alice EC-Private Key Alice Public Key Bob EC-Private Key Bob
Input Message

Any private key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen, for extra security run this software on your network, no cloud dependency

Generating EC Keys and Parameters

[bash]$ openssl ecparam -list_curves

  secp256k1 : SECG curve over a 256 bit prime field

  secp384r1 : NIST/SECG curve over a 384 bit prime field

  secp521r1 : NIST/SECG curve over a 521 bit prime field

  prime256v1: X9.62/SECG curve over a 256 bit prime field

An EC parameters file can then be generated for any of the built-in named curves as follows:

[bash]$ openssl ecparam -name secp256k1 -out secp256k1.pem

[bash]$ cat secp256k1.pem

-----BEGIN EC PARAMETERS-----

BgUrgQQACg==

-----END EC PARAMETERS-----

 To generate a private/public key pair from a pre-eixsting parameters file use the following:
[bash]$ openssl ecparam -in secp256k1.pem -genkey -noout -out secp256k1-key.pem
[bash]$ cat secp256k1-key.pem
-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIKRPdj7XMkxO8nehl7iYF9WAnr2Jdvo4OFqceqoBjc8/oAcGBSuBBAAK
oUQDQgAE7qXaOiK9jgWezLxemv+lxQ/9/Q68pYCox/y1vD1fhvosggCxIkiNOZrD
kHqms0N+huh92A/vfI5FyDZx0+cHww==
-----END EC PRIVATE KEY-----

Examine the specific details of the parameters associated with a particular named curve
[bash]$ openssl ecparam -in secp256k1.pem -text -param_enc explicit -noout
Field Type: prime-field
Prime:
00:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:
ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:fe:ff:
ff:fc:2f
A: 0
B: 7 (0x7)
Generator (uncompressed):
04:79:be:66:7e:f9:dc:bb:ac:55:a0:62:95:ce:87:
0b:07:02:9b:fc:db:2d:ce:28:d9:59:f2:81:5b:16:
f8:17:98:48:3a:da:77:26:a3:c4:65:5d:a4:fb:fc:
0e:11:08:a8:fd:17:b4:48:a6:85:54:19:9c:47:d0:
8f:fb:10:d4:b8
Order:
00:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:
ff:fe:ba:ae:dc:e6:af:48:a0:3b:bf:d2:5e:8c:d0:
36:41:41
Cofactor: 1 (0x1)