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The encryption method used for VPN tunneling, is:
IPSec
CHAP
EAP
RAS
The IP Security protocol or IPsec at the network layer, is used for the purpose of encryption in VPN. CHAP and EAP are both used for authentication - not encryption. RAS is a generic term for a Remote Access Service.
****EDIT**** IPsec is a protocol, not an encryption method!
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