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Security constraint results in \textit{rate-loss} in wiretap channels. Inthis paper we propose a coding scheme for two user Multiple Access Channel withWiretap (MAC-WT), where previous messages are used as a key to enhance thesecrecy rates of both the users until we achieve the usual capacity region of aMultiple Access Channel (MAC) without the wiretapper (Shannon capacity region).With this scheme all the messages transmitted in the recent past are securewith respect to all the information of the eavesdropper till now. To achievethis goal we introduce secret key buffers at both the users, as well as at thelegitimate receiver (Bob). Finally we consider a fading MAC-WT and show thatwith this coding/decoding scheme we can achieve the capacity region of a fadingMAC (in ergodic sense).

Enhancing Secrecy Rate Region for Recent Messages for a Slotted Multiple Access Wiretap Channel to Shannon Capacity Region