  Quantum conference is a process of securely exchanging messages between three
or more parties, using quantum resources. A Measurement Device Independent
Quantum Dialogue (MDI-QD) protocol, which is secure against information
leakage, has been proposed (Quantum Information Processing 16.12 (2017): 305)
in 2017, is proven to be insecure against intercept-and-resend attack strategy.
We first modify this protocol and generalize this MDI-QD to a three-party
quantum conference and then to a multi-party quantum conference. We also
propose a protocol for quantum multi-party XOR computation. None of these three
protocols proposed here use entanglement as a resource and we prove the
correctness and security of our proposed protocols.
