Abstract—In healthcare wireless sensor networks (HWSNs), a
lot of personal medical data are collected by wireless sensors.
Given that a medical diagnostic analysis heavily relies on these
medical data, any tampering with medical data may potentially
result in severe consequences. So how to efficiently authenticate
the collected medical data is a challenging work in such resourceconstrained application scenarios. In this paper, we propose
an efficient aggregate signature scheme with designated verifier
based on the Schnorr signature over an elliptic curve group for
HWSNs. In our signature scheme, the set of many individual
signatures on very large amounts of collected medical data can
be compressed into a concise aggregate signature and their
availability can be reduced to the validity of the aggregate signature only believed by a designated verifier. Unauthorized entities
cannot trace the origin of these medical data authenticated by
the aggregate signature. Meanwhile, our proposed scheme can
also stop compressing any invalid individual signature into a
valid aggregate signature even if all signers collude. Malicious
signers are unable to deny the authenticated data by forging
a valid aggregate signature based on several invalid individual
signatures. Experimental simulation shows that the computation
cost of our provably secure aggregate signature scheme is notably
lower than that of existing works.
