Abstract: A system and method for encryption, transmission and decryption of data based on a publicly or other wide area broadcast random number sequence. Encryption is by a selected subsequence from the broadcast random number sequence, the selection being at a sample time relative to a synchronization event, with the sample time calculated based on a private key. Decryption uses the same private key to select the same subsequence from the broadcast random number sequence, as detection by the sender and receiver of the synchronization event and a sampling time based on a commonly known private key allows the sampling to be synchronous. Alternative embodiments employ trusted agents if the tender and receiver do not have a common private key.

Abstract: In a telecommunications system where the price of communications is established by the network operator (“the seller”) in accordance with actual or predicted demand in such fine increments that it becomes “dynamic” from the user's perspective because the prices vary to such a high degree that individual users (“buyers”) are unable to execute a rational economic decision without incurring prohibitively high transaction costs. The present invention provides a method to reduce the transaction costs of such a system by determining and storing individual users' “threshold prices” for a variety of communications and circumstances.

Abstract: A system and method for enabling a user of wireless communication services such as mobile cellular telephone services to easily switch among various available service providers based on real time cost and service feature information. A central processing facility serves as an intermediary between mobile communication users and service providers and broadcasts real time service provider information over an established information channel, in each region served by wireless communication carriers. Users are able to select an optimal service provider based on the received service provider information. In this way, competition among wireless carriers is enhanced.