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IBC is emerging as an important contender to traditional public key cryptography for its attractive properties. But the Wireless Transport Layer Security (WTLS) protocol does not support it at present. To resolve this problem, an improved WTLS protocol based on IBC (IB_WTLS) is proposed. Firstly, new cipher suits are designed for WTLS protocol, which give support to IBC scheme. Secondly, the IBC-based authentication is implemented by using IBC public-keys instead of X.509 public-keys. At last, IB_WTLS protocol message architecture is improved by defining a set of entity interaction operation sequences. The results show that IB_WTLS have advantages of lightweight and efficiency of IBC, as well as easy to deploy.