Synchronoss Technologies, Inc.
System and method for proof-of-work based on hash mining for reducing spam attacks

Abstract:

A method for providing a proof-of-work challenge based on hash mining for reducing spam attacks comprising: receiving an email message from a client device; determining a level of trustworthiness of the client device; generating a challenge message based on the determined trustworthiness of the client device; transmitting the challenge message to the client device; receiving a response to the challenge message from the client device; and forwarding the email to one or more recipients when the response to the challenge message is correct.