  The quantum key distribution network with Vernam's One Time Pad encryption
and secret sharing are powerful security tools to realize an information
theoretically secure distributed storage system. In our previous work, a
single-password-authenticated secret sharing scheme based on the QKD network
and Shamir's secret sharing was experimentally demonstrated; it confirmed ITS
data transmission, storage, authentication, and integrity. To achieve data
integrity, an ITS message authentication code tag is employed and a data owner
of the secret sharing performs both the MAC tag generation and verification.
However, for a scenario in which the data owner and end users are different
entities, the above approach may not work since the data owner can cheat the
end users. In this paper, we resolve this problem by proposing an ITS integrity
protection scheme employing a third-party verification with time-stamp.
