WEP is the least secure of any.
Not sure if WPA PSK2 requires compatable hardware/software/firmware at "both ends" but for a home network WPA is fine. Just choose a totally random passkey.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
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