crypto implementation for small footprint devices

Hi, I am currently looking for crypto implementation that can fit into small footprint (in the order of 50K or less) devices. Ideally, an SSL type of protocol meets my requirements but it is almost impossible to implement it within 50K even with selected cipher suites. So, I am looking for alternatives (either symmetric key or public key based). I was thinking about WTLS but looks like its implementation can not be significantly smaller than that of TLS since it is also based on Public Key cryptography (I am wondering how it fits into a cellphone). Can any one tell me what is the approximate size of the client implementation of WTLS. Also, would anyone send some pointers to me regarding what I am looking for. Thanks in advance!! Peter