Abstract: A method binds devices connected by a wireless network by setting a first timeout in a master device. A key exchange is performed between the master and a slave device. The key exchange is terminated if the first timeout expires and the key exchange is incomplete. Then, a second timeout is set in the master device and a third timeout is set in the slave device if the key exchange is complete. A binding to the slave device is established in the master device if the master device receives a response from the slave device after the second time expires. Otherwise the slave device is disabled. A binding to the master device is established in the slave device if the third timeout expires and there is only one key exchange detected by the slave device.

Abstract: A method authenticates packets that are transmitted serially in a network. A current password is selected for a current packet to be transmitted. The current packet includes current data. A one-way/one-time hash function is applied to the current password to form a current tag. A next password is selected for a next packet that includes next data, and the one-way/one-time hash function is applied to the next password to form a next tag. The one-way/one-time hash function is then applied to the next data, the next tag, and the current password to obtain a hashed value. The current packet is then transmitted to include the hash value, the current data, the current tag, and a previous password of a previous transmitted packet to authenticate the current data.

Abstract: A method securely communicates data between members of a group of mobile devices using a wireless channel. The members include a group leader. Each member is associated with a physical token. Each member and associated token stores a binding key. Each member also stores an identification. A session key is stored by the group leader. Each token generates a member key, which is encrypted with the binding key and transmitted to the member where it is decrypted and stored. The session key is distributed securely to each member. Each member key is securely passed to the group leader. Then, data to be communicated between the group leader and a particular member can be encrypted using the using the associated member key of the particular member and the session key.

Abstract: A method and system establishes a link key for encrypting and decrypting messages between a first device having a symmetric secret key and a second device having an asymmetric public key and private key. The first device encrypts the secret key with the public key and a first random number with the secret key. The second device decrypts the secret key with the private key and the first random number with the secret key. Then, the second device encrypts a second random number with the secret key, which is decrypted in the first device with the secret key. The first and second devices can then combine the first and second random numbers to establish the link key for encrypting and decrypting messages between the first and second device.