Abstract: A process and a device for authenticating the signature of a signed message includes a nominal signature card (1a) coupled to a transmitting device 1 which sends signed messages. The card (1a) includes at least one memory (5) in which there are secretly prerecorded at least one secret key (S) and one program (P) which automatically processes the signature of a message (M), as well as circuits (6) for computing the signature (SG). A control card (3b), which is not nominal, is coupled to a device (3) for receiving signed messages. The card (3b) includes at least one memory in which there are secretly prerecorded at least the secret key (S) and the program (P) for recomputing via processing circuits (15) the signature (SG) of the received message (M).

Abstract: In a system for the transmission of confidential data between a transmitter 1) and a receiver (3), the transmitter (1) transmits a standard key E to the receiver (3). The standard key E preferably is a random number generated within the transmitter (1). An element at the location of the transmitter (1) calculates an intrinsic key R.sub.1 for coding the data to be transmitted, and an element at the location of the receiver calculates an intrinsic key R.sub.2 for decoding the data. The calculation of each of the intrinsic keys R.sub.1 and R.sub.2 is accomplished in each case by a microprocessor (4' and 5') situated within a portable object (4 and 5) which also includes a memory (4" and 5") storing a program, a secret code S, and an identification code I.sub.n. The intrinsic keys R.sub.1 and R.sub.2 are each calculated as a function of the secret code S, the identification code I.sub.n, and the standard key E. The portable objects at the transmitter and receiver ends of the system must be matched.

Abstract: The invention relates to apparatus for clamping superimposed conductive elements (11, 13) disposed in aligned groups by means of a clip device (22, 23) such that an integrated circuit device may be removably connected to a printed circuit card with a predetermined force being applied uniformly across all the superimposed elements. In accordance with the invention, at least one of the clips (22, 23), in the free state, has a cambered form, equivalent to the elastic deformation of an initially straight beam of uniform section and of the same length mounted on two simple supports spaced this length and uniformly charged over this length.The invention is primarily used for the electrical interconnection of integrated circuit devices to printed circuit cards.

Abstract: A control logic circuit (C) is provided in each unit such as processors and emories in a multiple processor data processing system. Each control logic circuit (C) is equipped with a priority circuit (P12) which at one input receives the eligible local calls (RQ.sub.i L) of the unit itself and at the other input receives external calls (RQ.sub.k) transmitted by the other units. The control logic circuit (C) enables control by its unit of a transmission but only when its priority circuit (P12) recognizes that unit as having the highest priority among the other units. The logic circuit (C) together with a T circuit (13) selects local calls as a function of the state of occupation of the data lines of the transmission bus.

Abstract: An insulative data carrier of the credit card type having a protective device that protects electronic circuits, such as integrated circuits (3a, 3b), incorporated therein against electrostatic charges, said electronic circuits being mounted on an auxiliary electrically insulating carrier element (2, 4) disposed within a recess in an insulative carrier and having fixed input/output contacts (5) connected by an interconnecting net (6, 7) to input/output terminals (8) mounted on said auxiliary carrier element (4). The terminals (8) are accessible from the outside and are concentrated in at least one zone of the carrier element (4). At least one metal ring (20) carried by said carrier element (4) is mounted so as to circle said input/output terminals (8) concentrated in said zone.

Abstract: Applicant processes to be performed on several processors in a data processing system are synchronized and allocated. The data processing system includes plural processors, each of which derives a control signal indicating that an event has occurred which requires a change in the status of the system, as well as registers for storing signals indicative of a process being executed by the processor. A memory common to the processors is selectively coupled to the processors via a bus. A circuit connected to the memory, the bus and selectively coupled to the processors selectively couples signals between a selected processor and the memory via the bus.

Abstract: The invention relates to a device that permits removal of excess developer particles on the surface of a recording element and comprises a suction conduit (22) having at one end a port (23) in the form of a slot and at its other end a cylindrical chamber (25) which communicates with said conduit. The generators of the chamber run parallel to the port (23). The chamber includes a suction port (32) which is connected to a suction source, and an air inlet port (31) which discharges into the free atmosphere (31).

Abstract: A portable hand-held machine M1 includes a keyboard M4, a display screen a microprocessor, and a memory. The machine includes a receptacle M2, and a connector M6 to enable connection to at least one removable carrier M3 comprising a memory associated with a microprocessor M8. Circuits are provided for establishing a dialog between the machine M1 and the removable carrier M3.

Abstract: A powder suitable for developing latent magnetic images comprising magnetic particles coated with a mixture of a thermoplastic resin and a silane. A method for producing the said powder comprising hot-forming a mixture of magnetic particles, a thermoplastic resin and a silane, cooling and reducing the cooled mass to a fine powder.

Abstract: A controller for microinstructions grouped into microprogram segments, each of which defines a base of a microprogram segment which is to be executed, includes a bank of addressable base registers. Each register in the bank stores an indication of a base in the memory. Registers in the bank are addressed so that the addressed register derives a signal indicative of the base address. Included are an address register for the memory and an output register for microinstructions read from the memory. The address and output registers respectively have outputs and inputs coupled to an address input and a read output of the memory. An adder has inputs responsive to the base indicating signal of the addressed register and to an output of the memory output register. The adder has an output coupled to an input of the address register. The output of the memory output register is coupled to an input of the means for addressing registers in the register bank to control which register of the base register bank is addressed.

Abstract: An optoelectronic device for reading data contained on the magnetic surface f a carrier comprises a source (SLP.sub.i) for emitting a beam of polarized light and means (MDK.sub.i) for detecting the angle of rotation of the polarization plane of the light. An optical focusing lens is provided for focusing onto a large observation field to enable simultaneous viewing of a plurality of tracks and a plurality of data on each track. Projection lenses (MPROJ.sub.i) enable projection of the image of the surface viewed by the optical means onto a plane P where optoelectronic transducers (TRPE.sub.ij) have been set up. The transducers may be arranged in a matrix or along a straight line.

Abstract: The invention relates to an apparatus for converting electric signals representing data into a group of raised dots constituting the image of said data and comprises a magnetic recording medium (10) provided at its surface with hollow cells which, after being magnetized by a recording unit (14) are capable of attracting balls (16) contained in a trough (15). The balls attracted in this way are received and held in the cell and form a group of raised dots at the surface of the medium (10). The raised dots can function as reading devices for the blind or for people with poor eyesight or can be used to imprint a tape or other medium.

Abstract: Apparatus is disclosed for controlling and monitoring a modular power supply system for supplying power to a data processing system and the like that includes a plurality of power sources allocated among a plurality of power supply subsystems in a predetermined configuration. Each subsystem is interfaced to the control bus of a control unit that includes a microprocessor by an addressable interface unit that controls the power sources in response to control signals from the control unit and that monitors the power sources and the devices powered by such sources and supplies monitor signals to the control unit.

Abstract: A magnetoresistant transducer is described for reading very high-density a. The magnetoresistant transducer (TMRI) includes at least one magnetoresistor (MRI) of an anisotropic magnetic material placed perpendicular to the direction in which the data of a medium (SM) pass. The axis (AFAI) of easy magnetization of the magnetoresistor is normal to the medium and includes a thin, mono-range or single domain magnetic anisotropic layer (CI) normal to the medium and to the direction in which the data pass. The mono-range or single domain layer is strongly coupled magnetically with the magnetoresistor, and its axis of easy magnetization (AFACI) is normal to the medium and opposite in direction to the axis of easy magnetization of the magnetoresistor. The invention is particularly applicable to the reading of magnetic tapes and disks containing high density data.

Abstract: The invention relates to apparatus for positioning and holding a screen carrier in a serigraphic machine. The positioning and holding apparatus is essentially constituted by two parallel grooves (21, 22) machined in the screen carrier (10) and cooperating stops and a side latch mechanism on the machine. The two grooves have at least one extremity opening on the same edge (C1) of the screen carrier. In these two grooves (21, 22) are respectively mounted the two stops (23, 24) which are designed to come respectively into contact with two fixed reference pins carried by the serigraphic machine. During insertion of the screen carrier, by sliding in its plane along two sides of the serigraphic machine, the two reference pins ride in the respective slots contacting the stops when the screen carrier is inserted fully. A latch locking arrangement is provided on the machine or maintaining and holding the screen carrier in position once the reference pins are in contact with the associated stops.

Abstract: Platform comprising a principal member containing a read and/or record transducer for a data carrier and a suspension device connected on the one hand to the said principal member and on the other hand to means of supporting the platform.In accordance with the invention, the platform is characterized in that is comprises means for modifying the flow of air around all or part of the principal member and of the suspension device. A protective fairing of walls envelope the principal member to minimize turbulent effects on the transducer.

Abstract: A central sub-system of a data processing system, including an operator console controlling a service processor, is divided into several sub-units, functioning separately from each other. The sub-units include processors that are connected together and to a common controller for a common memory unit by data, address and control buses. Each sub-unit includes a configuration device that stores an appurtenance indicator derived from the service processor in response to sub-unit initialization, and enables its associated sub-unit to exchange data with the memory unit. The sub-unit having the highest priority of the sub-units attempting to access the memory units is connected to the memory unit by the controller. A single configuration memory stores an indication of the sub-units in service in the central sub-system. The configuration memory is addressed each time the memory unit is addressed by a signal indicative of the appurtenance indicator derived from the selected sub-unit.

Abstract: The user has a credit card incorporating electronic devices and/or circuits. The facility which is to be protected has an electronic device and/or circuit analogous to that of the credit card. The devices of the credit card and of the facility contain in their respective memories a secret code S, an identification code I.sub.n, and a program p. The facility which is to be protected has available a generator of a random code E which is transmitted into each of the devices when a request for access is made. The devices within the card and the facility each calculate the function R=p(S, E, I.sub.n), and a comparator situated in the facility which is to be protected compares the functions supplied by each of the devices to allow or deny access of the person to the said facility.

Abstract: The transmission of signed messages occurs between a transmitter (1) and a receiver (3) connected by a transmission line system (2). The transmitter (1) and the receiver (3) respectively comprise a coding device 7 and a decoding device 11. Means 4 situated at the transmitter supply a signature SG as a function of the message M which is to be transmitted. The message associated with its signature, as well as a common key E, are transmitted by the transmitter towards the receiver after coding by means of an intrinsic key R.sub.1. Upon being received, the message M linked with its signature SG is decoded by means of an intrinsic key R.sub.2 determined at the receiver location in such manner as to establish equality between intrinsic keys R.sub.1 and R.sub.2.

Abstract: A data byte element E located at position d in entry i of memory section M.sub.a having reference entry TR is addressed. Memory section M.sub.a is one section of a table in a data processory memory, such that each of the entries in section M.sub.a has a predetermined number (t) of elements E. Signals having values related to the values of i, t and TR of several memory sections are stored in a storage device and read out when the storage device is addressed. A signal related to the value of d is also derived as a result of read-out from the storage device. The signals having values related to the values of i, t, TR and d are combined to derive an addressing signal for element E in memory section M.sub.a of the table of the data processing memory. An address circuit for the data processing memory responds to the addressing signal to addressing element E in memory section M.sub.a.