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ECDSA Playground

ECDSA Playground
ECDSA Playground

Elliptic Curve Digital Signature Algorithm or ECDSA is a cryptographic algorithm used by Bitcoin to ensure that funds can only be spent by their rightful owners.
This tool is capable of generating key the the curve
"c2pnb272w1", "c2tnb359v1", "prime256v1", "c2pnb304w1", "c2pnb368w1", "c2tnb431r1", "sect283r1", "sect283k1", "secp256r1", "sect571r1", "sect571k1", "sect409r1", "sect409k1", "secp521r1", "secp384r1", "P-521", "P-256", "P-384", "B-409", "B-283", "B-571", "K-409", "K-283", "K-571", "brainpoolp512r1", "brainpoolp384t1", "brainpoolp256r1", "brainpoolp512t1", "brainpoolp256t1", "brainpoolp320r1", "brainpoolp384r1", "brainpoolp320t1", "FRP256v1", "sm2p256v1" 
secp256k1 refers to the parameters of the elliptic curve used in Bitcoin’s public-key cryptography, and is defined in Standards for Efficient Cryptography (SEC)
A few concepts related to ECDSA:
  • private key: A secret number, known only to the person that generated it. A private key is essentially a randomly generated number. In Bitcoin, a private key is a single unsigned 256 bit integer (32 bytes).
  • public key: A number that corresponds to a private key, but does not need to be kept secret. A public key can be calculated from a private key, but not vice versa. A public key can be used to determine if a signature is genuine (in other words, produced with the proper key) without requiring the private key to be divulged.
  • signature: A number that proves that a signing operation took place.
Openssl Generating EC Keys and Parameters
$ 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:
$ openssl ecparam -name secp256k1 -out secp256k1.pem $ 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:
$ openssl ecparam -in secp256k1.pem -genkey -noout -out secp256k1-key.pem $ 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
$ 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) 
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What is digital signature? - YouTube

Secp256k1 calculator First, we’ll use OpenSSL to generate a sample keypair from the command line. Read and learn for free about the following article: Modular inverses The encrypt() method of the SubtleCrypto interface encrypts data. Ecdsa online. Bitcoin is a good example of a system that relies on ECDSA for security. tar. Apache, Nginx), SMTP server (e. uk Our site is a participant in ' To create an ECDSA signature, the data first needs to be hashed. As of OpenSSH 7. f. Public key cryptography is the science of designing cryptographic systems that employ pairs of keys: a public key (hence the name) that can be ... libsecp256k1已经成为bitcoin社区事实上的标准,成为开发者唯一能选择的官方库。 libsecp256k1 与 openssl ecdsa的主要差别之一,在于bip62提出的"Low S values in signatures"规则。libsecp256k1中包含了对规则的自动应用,而openssl ecdsa需要开发者自己实现该规则。 3. 关于"Low S values ... I have all this working using ECDSA keypairs generated on the fly - i.e. my code is working nicely - but now I need to do the certificate piece. And I figured I could use OpenSSL's command-line to create the certificate which is installed on the client (along with the ECDSA private key in a separate file). not exactly ECDSA, but served me alot for Bitcoin undertsanding/testing. Security hint: you would never provide/use a private key to/from such a public website, unless you are really sure of what you are doing. Be extremly careful. share improve this answer follow answered May 15 '17 at 23:14. pebwindkraft pebwindkraft. 4,736 2 2 gold badges 9 9 silver badges 32 32 bronze badges. The ...

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What is digital signature? - YouTube

A digital signature is equivalent to a handwritten signature in paper, and a digital signature serves three basic purposes. Digital signature is commonly use...