L2 Mobile Technologies LLC

Asustek Computer Inc.

Chi-Fong Ho

Richard Lee-Chee Kuo

Sam Shiaw-Shiang Jiang

23A wireless communications device has a first security key, a second security key, and established channels. Each established channel has a corresponding security count value, and utilizes a security key. At least one of the established channels utilizes the first security key. The second security key is assigned to a new channel. A first set is then used to obtain a first value. The first set has only security count values of all the established channels that utilize the second key. The first value is at least as great as the x most significant bits (MSB) of the greatest value in the first set. The MSBof the initial security count value for the new channel is set equal to the first value. If the first set is empty, then the initial security count is set to zero.

Preventing shortened lifetimes of security keys in a wireless communications security system

A start value is x bits in size and is used to provide an initial value to an n-bit security count value. A wireless communications device establishes channels with a compatible device, and releases channels established with the compatible device. For every channel established by the wireless communications device, a corresponding terminal value is obtained. A terminal value for a channel is the highest value reached by the x most significant bits (MSB ) of an n-bit security count value associated with the channel. The security count value is used to encipher data transmitted along the channel. A final value that is obtained that is the greatest value of all the terminal values. Finally, a start value is stored in the memory of the wireless device that is at least as large as the final value.

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Hsin-Chu Hsien, Taiwan

Chi-Fong Ho