Abstract: Embodiments of the invention assist conversion of an old data table to a new data table in a communication terminal. An edit script is created by creating an old and new data trees from the old and new tables respectively. A first partial script which converts the old tree to an intermediate tree having the same length as the new tree is then determined. A second partial script which converts the intermediate tree to the new tree is also determined. The first and second partial scripts are then combined to provide a script which can be sent the terminal. The first partial script is preferably a minimum cost series of edits causing only insertions and deletions in the old data tree. The second partial script is preferably a minimum cost series of edits causing only substitutions in the intermediate tree.

Abstract: Encryption keys in a communication system are updated according to rekey groups having a common set of encryption keys or CKRs. Each group includes a number of radios with active and inactive keysets. A database records the relationships between rekey groups and keys, and the status of their keysets. An operator first determines one or more keys to be updated. New keys are then transmitted to each radio in one or more rekey groups using respective rekey messages. The new keys are stored in the inactive keysets of the radios. The inactive keysets are then activated using respective changeover messages. Deployment of new keys is carried out by software in the form of automated update tasks.