E. The Misuse of LFSR
The authors claim that the LFSR values are used to obscure
the transmission between the reader and the tag. They also
point out that the LFSR values are obscured by random values.
However, our main observation is that an LFSR alone is far
from masking the ID of tags. By combining the information
gathered from a full session and a subsequent query of the
reader, we observe that an adversary can easily find out
the secret ID.