  The unique features of quantum walk, such as the possibility of the walker to
be in superposition ofthe position space and get entangled with the position
space, provides inherent advantages that canbe captured to design highly secure
quantum communication protocols. Here we propose two quan-tum direct
communication protocols, a Quantum Secure Direct Communication (QSDC)
protocoland a Controlled Quantum Dialogue (CQD) protocol using discrete-time
quantum walk on a cycle.The proposed protocols are unconditionally secure
against various attacks such as the intercept-resend attack, the denial of
service attack, and the man-in-the-middle attack. Additionally, theproposed CQD
protocol is shown to be unconditionally secure against an untrusted service
providerand both the protocols are shown more secure against the intercept
resend attack as compared tothe qubit based LM05/DL04 protocol.
