TY - RPRT TI - Guide to IPsec VPNs AU - Barker, Elaine AU - Dang, Quynh AU - Frankel, Sheila AU - Scarfone, Karen AU - Wouters, Paul PY - 2020 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 800-77r1 DO - 10.6028/NIST.SP.800-77r1 ER -