Abstract: An enciphering and deciphering apparatus in the form of a typewriter having an input device for the input of characters to be processed, a control device for the input of control commands determining the mode of operation of the apparatus and an output device possessing at least one page printer. A display device is connectable with the input device for the stepwise progressive display of the infed characters. The output side of the display device can be selectively connected with the printer, with a cipher computer or a key character storage associated with the cipher computer. The cipher computer has its output side connectable with the printer. A central control unit is provided which can be controlled by the control device.

Abstract: An apparatus for the transmission end-enciphering and reception end-deciphering of information comprising an enciphering device arranged at the transmitter for receiving plain text in the form of information signal groups separated from one another by separation or partition signals. At the transmitter there is provided a controllable control circuit operatively connected with a key character-information storage. The control circuit, when activated, causing a change of the key character information entered by the key character-information storage to the enciphering device and due to such change replacing the separation signals between the information signal groups by control signals representative of the key character-information.

Abstract: A transmitting and a receiving station for generating, converting and transmitting and receiving speech signals are disclosed. The transmitting station includes a transducer for converting an acoustical signal into an analogue electrical signal and a band limiting filter for filtering out those components of the analogue electrical signal which have frequencies falling above or below a predetermined frequency band. An emphasizing circuit adjusts the amplitude of those frequency components of the band limited analogue electrical signal falling within the predetermined frequency band such that the power of each of the components is substantially equal. A syllabic amplitude compressor having a forward acting regulation time constant which is greater than its backward acting regulation time constant regulates the amplitude of the adjusted, band limited, analogue electrical signal.

Abstract: An electronic enciphering- and deciphering apparatus in the form of a pocket calculator, comprising an input device for the input of characters to be processed, a control device for the input of control commands determining the function of the apparatus, an output device for the display of information, and a power source for the apparatus. A primary storage or memory serves for the storage of the entered character information, the output side of which can be connected with the output device and a cipher computer which can be connected at its output side with the output device. At least one key character storage is operatively associated with the cipher computer, the key character storage being connectable with the input device. A central control unit can be controlled by the control device.

Abstract: A method of, and apparatus for, the synchronization of a deciphering device operating as a receiver with an enciphering device operating as a transmitter, wherein at the transmitter end between information pulse series at a fixed spacing from one another there are inserted a given number of auxiliary pulses similar to the information pulses. Each inserted auxiliary pulse series is produced from the previously inserted auxiliary pulse series in accordance with a predetermined formation principle. At the receiver end the pulse series transmitted by the transmitter is stored in a storage and the stored pulses compared with comparison pulse series in order to determine coincidence of the stored auxiliary pulser series with the comparison pulse series. The comparison pulse series possess the same number of pulses and are formed according to the same formation principle as the auxiliary pulse series.

Abstract: A method of, and apparatus for, synchronizing a receiver end-Key Generator with a transmitter end-Key Generator wherein both Key Generators are coupled with a respective counter such that each counter state of each counter characterizes a place or position of the Key pulse chain produced by the associated Key Generator. Each counter state is formed in accordance with a formation principle from the preceding counter state. The counter state of the counter of the transmitter end-Key Generator is transmitted to the receiver end and there compared with the counter state of the counter of the receiver end-Key Generator and whenever there is a difference between both counter states the receiver end-Key Generator stepped forward until the difference is again zero.

Abstract: A plug-in type program storage comprising at least a multiplicity of individual storage elements which can be electrically and mechanically disconnectably coupled with electrical data processing devices. The storage elements are constructed with the same technology as switching elements of the data storage device, and which switching elements cooperate with such storage elements, so that the information transfer from the program storage can occur without any intermediate transducer stage, and programming of the program storage is possible without the need for any special auxiliary means at the data processing device.