olemus
ründeotstarbelise teabe kaudne kogumine sihtobjekti kohta
= indirect collection of information about the attack target object

näiteid
hoone välisvaatlus, leheluure, prügisorimine,
vestluste pealtkuulamine

ülevaateid
https://www.techopedia.com/definition/4040/passive-reconnaissance

https://asmed.com/active-vs-passive-reconnaissance/

https://allabouttesting.org/passive-reconnaissance-techniques-for-penetration-testing/

https://perso.liris.cnrs.fr/romuald.thion/files/RT_Papers/Thion07:Cyber:Network.pdf

https://nudesystems.com/passive-reconnaissance-explained-methods-tools/

https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.278.5965&rep=rep1&type=pdf

https://studenttheses.universiteitleiden.nl/access/item%3A2700328/view