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== Security ==
CoAP defines four security modes:<ref> [https://tools.ietf.org/html/rfc7252 RFC 7252, Constrained Application Protocol (CoAP)]</ref>
* NoSec, where [[DTLS]] is disabled
* PreSharedKey, where DTLS is enabled, there is a list of pre-shared keys, and each key includes a list of which nodes it can be used to communicate with. Devices must support the AES cipher suite.
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