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Password-based authentication protocols are the strongest among all methods which has been proposed through the period that wireless networks have been rapidly growing, and no perfect scheme has been provided for this sensitive technology. The biggest drawback of strong password protocols is IPR (Intellectual Properties Right); hence they have not become standard; SPEKE, SRP, Snapi and AuthA for instance. In this paper we propose a userfriendly, easy to deploy and PKI-free protocol to provide authentication in WLAN. We utilize elliptic curve and digital signature to improve AMP (Authentication via Memorable Password) and apply it for wireless networks as AMP is not patented and strong enough to secure WLAN against almost all possible known attacks.