import hashlib
import hmac


def generate_signature(request_body, secret):
    """
    Return a cryptographic signature that can be used to verify the authenticity of webhook data.
    """
    hmac_prep = hmac.new(
        key=secret.encode('utf8'),
        msg=request_body,
        digestmod=hashlib.sha512
    )
    return hmac_prep.hexdigest()