Unobservability is considered to be a sub-property of privacy hiding the leakage of all information about any details of the transaction. It refers to the impossibility for all other entities except the two involved peers to derive useful information about an ongoing transaction. It is a must, when the communication relies on a public channel and the identity of the participants is exchanged during the transaction.
It is even possible to hide the existence of a fairCASH communication. Our two peers applying to that opportunity should:
- First establish a Hyper Text Transfer Protocol Secure (HTTPS) or any other protocol providing encrypted communication and secure identification on the network usable for sensitive transactions in ITC systems. The main idea is to create a secure channel over an insecure network ensuring reasonable protection from eavesdroppers and Man-In-The-Middle-Attacks (MITMA). Such a mechanism is suitable to conceal the fact of a fairCASH transaction. It is NOT used to secure the transaction, which is already done by fCCP itself, due of being able to stand-alone.
- Inside this safe and secure communication channel, our fCCP should then be applied for an execution-run performing the payment transaction.
fairCASH uses VPN/VPC inside the fCCP as security measure against attackers and all other third parties attempting to tap the channel.