  We consider a cryptographically motivated framework for quantum metrology in
the presence of a malicious adversary. We begin by devising an estimation
strategy for a (potentially) altered resource (due to a malicious adversary)
and quantify the amount of bias and the loss in precision as a function of the
introduced uncertainty in the resource. By incorporating an appropriate
cryptographic protocol, the uncertainty in the resource can be bounded with
respect to the soundness of the cryptographic protocol. Thus the effectiveness
of the quantum metrology problem can be directly related to the effectiveness
of the cryptography protocol. As an example, we consider a quantum metrology
problem in which resources are exchanged through an unsecured quantum channel.
We then construct two protocols for this task which offer a trade-off between
difficulty of implementation and efficiency.
