Wireless Application Protocol (WAP) is one of the technical standards for information over a mobile wireless network. Mobile devices such as mobile phones that use the protocol have a WAP browser as a web browser. WTLS (wireless transport layer security) inherited from TLS (Transport Layer Security). WTLS uses similar semantics adapted for a low bandwidth mobile device. As compared to TLS main changes are compressed data structures where possible packet sizes are reduced by using bit-fields, discarding redundancy and truncating some cryptographic elements. WTLS defines a compressed certificate format. This broadly follows the X.509 v3 certificate structure, but uses smaller data structures. Packet based design TLS is designed for use over a data stream. WTLS adapts that design to be more appropriate on a packet based network. WTLS design is based on a requirement that it be possible to use a packet network such as SMS as a data transport. There are number of WTLS security issues. WTLS processing more is fast as compared to using SSL. So it is suitable for wireless system. WTLS uses modern cryptography tools to enhance security. WTLS can provide different level of security for privacy, data integrity and authentications.