  The "weak" relay-eavesdropper channel was first studied by Lai and El Gamal,
whose achievable scheme introduced noise forwarding (NF) and used backward
decoding. We suggest a novel sliding window decoding scheme with a two block
decoding delay, where the relay uses compress-forward with Wyner-Ziv (WZ)
binning but does not use NF. Wireless engineers will welcome the reduced
decoding delay. Sliding window decoding mandates multiblock equivocation
calculations; dispensing with NF enables it. We identify nine regimes and
develop a case-by-case choice of relay channel codebook and WZ bin sizes to
maximize the secrecy rate. The multiblock equivocation calculations may be of
independent interest.
