1. A transaction device, comprising: a central processing unit (CPU) for processing data; a power supply for powering said transaction device; a transmitter for transmitting data; a receiver for receiving data; a converter consisting of one of (1) a transducer for transducing physical information to an analog information and an A/D converter for converting said analog information to digital format and (2) a transducer for transducing physical information to digital format; a memory for storing data in non-transitory form; wherein said memory stores, in non-transitory form, data related to identity of a device holder, and at least one steganographic or cryptographic key; a number generator for generating numbers; a cipher; and wherein said transaction device is designed to respond to an action of said device holder of said device, by using said converter to convert physical information of said device holder to digital information of said device holder; wherein said cipher is designed to use data comprising said key and said data related to identity of said device holder to generate ciphered output data; wherein said cipher is designed to establish a hierarchical set of one time signatures; and wherein said transmitter is designed to transmit said ciphered output data and one of said hierarchical set of one time signatures.