打开得到加密脚本：

import ecdsa
import random

def ecdsa_test(dA,k):

    sk = ecdsa.SigningKey.from_secret_exponent(
        secexp=dA,
        curve=ecdsa.SECP256k1
    )
    sig1 = sk.sign(data=b'Hi.', k=k).hex()
    sig2 = sk.sign(data=b'hello.', k=k).hex()

    r1 = int(sig1[:64], 16)
    s1 = int(sig1[64:], 16)
    s2 = int(sig2[64:], 16)
    return r1,s1,s2

if __name__ == '__main__':
    n = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
    a = random.randint(0,n)
    flag = 'flag{' + str(a) + "}"
    b = random.randint(0,n)
    print(ecdsa_test(a,b))

# (4690192503304946823926998585663150874421527890534303129755098666293734606680, 111157363347893999914897601390136910031659525525419989250638426589503279490788, 74486305819584508240056247318325239805160339288252987178597122489325719901254)

解密脚本：

import ecdsa
import random

def ecdsa_verify(dA, sig_r, sig_s, msg, k):
    # 从私钥 dA 和签名 r, s 验证消息
    sk = ecdsa.SigningKey.from_secret_exponent(
        secexp=dA,
        curve=ecdsa.SECP256k1
    )

    try:
        # 使用生成的签名验证消息
        valid = sk.verify((sig_r, sig_s), msg.encode())
        return valid
    except ecdsa.keys.BadSignatureError:
        return False

def ecdsa_test(dA, k):
    sk = ecdsa.SigningKey.from_secret_exponent(
        secexp=dA,
        curve=ecdsa.SECP256k1
    )
    sig1 = sk.sign(data=b'Hi.', k=k)
    sig2 = sk.sign(data=b'hello.', k=k)

    r1 = int(sig1[:32], 16)
    s1 = int(sig1[32:], 16)
    r2 = int(sig2[:32], 16)
    s2 = int(sig2[32:], 16)
    
    return r1, s1, r2, s2

if __name__ == '__main__':
    # 这个是用于模拟的私钥，实际情况中需要提供
    dA = 1234567890 # 私钥dA
    k = random.randint(0, 2**256)
    msg = 'Hi.'

    r1, s1, r2, s2 = ecdsa_test(dA, k)
    print(f"Signature for msg 'Hi.': r={r1}, s={s1}")
    
    # 验证签名
    is_valid = ecdsa_verify(dA, r1, s1, msg, k)
    print(f"Signature valid: {is_valid}")