Secret Sharing With Trusted Third Parties Using Piggy Bank Protocol

This paper presents a new scheme to distribute secret shares using two trusted third parties to increase security and eliminate the dependency on single trusted third party. This protocol for communication between a device and two trusted third parties uses the piggy bank cryptographic paradigm. We also present a protocol to give law enforcing agencies access to sensitive information present on a cell phone or a device using secret sharing scheme. The ideas for classical systems may also be applied to quantum schemes. Introduction A trusted third party (TTP) can be defined as an entity which is trusted by both parties to facilitate communication. Imagine a scenario in which two parties completely trust the TTP and use it to exchange secrets, but it is compromised or it becomes dishonest, then the system’s security will be completely broken. Thus, relying on a single trusted party is risky [1]. We can use two TTPs to reduce the risk and increase security, and in this paper we describe a protocol to distribute the secret shares using two TTPs to eliminate the dependency on single trusted third party in case it is compromised or becomes malicious. Imagine a cell phone or a device with sensitive information which may be a threat to national security is in the custody of law enforcing agency but they cannot access it because it is password protected and the data wipes out automatically if the wrong password is entered few times. The cell phone or device owner company has also refused to provide any backdoor for information to be accessed stating the reason that the backdoor may come in wrong hands and hence the security of phones or devices in someone’s physical ownership may be compromised. This in fact was what happened in the case between FBI and Apple a few months ago. Keeping such scenarios in mind, the use of secret sharing scheme becomes logical. In this paper, we present a protocol in which the cell phone data or device data is accessible to law