Abstract: An apparatus and method for using network address information to improve the performance and increase the functionality of network transactions. is disclosed. In a client network interface device having a processor and a memory coupled to the processor, the memory having stored therein sequences of instructions which when executed by the processor cause the processor to perform the steps of: 1) accessing a first server over a secure data communication line to obtain a client encryption key, 2) accessing a second server over an unsecure data communication line to establish a connection with the second server, 3) encrypting information sent to the second server over the connection using the client encryption key obtained from the first server, and 4) decrypting information received from the second server over the connection using the client encryption key obtained from the first server.

Abstract: In a wireless communication system (100), a communication unit parameter is sent to a plurality of communication units (105-108) during a first period of time using either a group update method or an individual update method (401). A first set of communication units that did not receive the communication unit parameter is determined (402) and, during a second period of time, the communication unit parameter is sent to the first set of communication units using only the individual update method (403). During the second period of time, the communication unit parameter is sent based on primary and/or secondary regions of operation for each communication unit and also upon detection of update opportunities. This process can be repeated for any number of communication unit parameters (404). Using this method, updates of communication unit parameters have a high likelihood of being successfully and efficiently performed.

Abstract: A secure communication network serves a plurality of terminals grouped into different security categories. Each terminal includes a replaceable security element containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular security version, the security elements in the affected category are replaced with new elements containing a different algorithm. The security elements are relatively low cost, and can be replaced on an as needed or periodic basis to maintain system security.

Abstract: An apparatus and method for loading a replacement computer program into a data encryption device having a central processing unit and a memory. The central processing unit is responsive to interrupt requests and operatively connected to a communications port. The memory has memory locations, and is partitioned into a data memory space and a program memory space, with the program memory space being read-only. The replacement computer program has a main entry point, and a load address which is the memory location at which the replacement computer program is to be loaded. When the occurence of an interrupt request, indicating a request to load the replacement computer porgram into the memory, is detected, the execution of a loaded computer program at a memory location is interrupted. Control is transferred to an interrupt routine. The replacement computer program is received through the communications port, and stored in the memory. The replacement computer program replaces the loaded computer program.

Abstract: A radar ECCM system for degrading the effect that a standoff noise jammer has on a radar receiving site that is tracking an incoming aerial target. The system effectively removes from the mainlobe of the beam emanating from the site the component of random noise contained in the jamming signal.