  Entanglement-measurement attack is a well-known attack in quantum
cryptography. In quantum cryptography protocols, eavesdropping checking can
resist this attack. There are two known eavesdropping checking methods. One is
to use decoy photon technology for eavesdropping checking. The other is to use
the entanglement correlation of two groups of non-orthogonal entangled states
for eavesdropping checking. In this paper, we prove the security against
entanglement-measurement attack for the qudit-system-based quantum cryptography
protocols which use the two methods for eavesdropping checking. Our security
proof is useful to improve the eavesdropping checking method used in quantum
cryptography protocols.
