Bull Cp8

Compagnie Internationale Pour L'informatique Cii-honeywell Bull (societe

Cii Honeywell Bull (societe Anonyme)

Compagnie Internationale Pour L'informatique Cii-honeywell Bull

Cp8 Transac

Compagnie Internationale Pour L'informatique

Cp8 Technologies

Cii Honeywell Bull

Establissement Public De Diffusion Dit 'telediffusion De France'

Etat Francais Represente Par Le Ministre Des P.t.t. (c.n.e.t.)

Michel Ugon

Louis C Guillou

Michel Hazard

Jean H Mollier

Jacques Patarin

Christoph Siegelin

Andre Oisel

Bertrand J De Pommery

Francois Chemin

Jean-Pierre Nonat

Yvon Gressus

Serge Fouchard

An unpredictable microprocessor or microcomputer comprises a processor (), a first working memory (), a main memory () containing an operating system, a main program (P) and a secondary program (P), a second working memory (), and switching means which, during the performance of the programs, makes it possible to switch from using one of the two working memories () to using the other working memory, while preserving their contents. Switching means comprise at least one first block of registers () for storing the operating context of the programs in the main memory and a switching circuit () for enabling one of the working memories and the access registers (A&#x2013;a) (d&#x2013;d) associated with each memory () and controlled by said switching circuit ().

System and method for using multiple working memories to improve microprocessor security

The present invention relates to a smart integrated circuit. This smart integrated circuit is characterized in that it has a main processor () and an operating system executing a main program (P) for constituting a main task-performing process, at least one secondary processor () capable of concurrently executing at least one secondary program (P) for constituting at least one task-performing process, power supply circuits () common to the processors and means for ensuring that the secondary processor or processors with similar power and different operating signatures are executed concurrently with the main process by continuously or intermittently inducing, in the power supply circuits, power disturbances that are superimposed on those of the main process so as to produce a continuous or intermittent scrambling.

Smart integrated circuit

Integrated circuit and method for decorrelating an instruction sequence

The invention relates to a process for loading a protected storage zone of an information processing device, with confidential data and/or programs, and to the associated information processing device. The information processing device (1) includes a module (8) that includes a non-volatile memory having a protected zone (11) which is read-write accessible to a processing means (9) inside the module, but is at least write-protected from outside the module. The process executes a transfer of confidential information to the protected zone (11) from an analogous protected zone (27) of a portable object (21) with a structure similar to that of the module. The portable object is received in a portable object reader (6) which is provided in the information processing device.

Process for loading a protected storage zone of an information

Process for entry of a confidential piece of information and associated

A data processing system is provided which includes at least one processing unit and at least one nonvolatile memory which is electrically erasable and reprogrammable at least under the partial control of the processing unit, with the system further including a reinitialization request signal detector which is operatively connected to a programming voltage inhibitor which is capable of inhibiting or preventing the application of at least one signal (V.sub.pp, WE, EE) to the nonvolatile memory, the signal being necessary for the programming of the nonvolatile memory, the reinitialization request signal detector operating to control the inhibitor such that the signal is inhibited from being applied to the nonvolatile memory at least when the reinitialization request signal is detected at a level sufficient to activate reinitialization.

Data processing system including programming voltage inhibitor for an

The invention relates to a method for signature of a primary information processing file (FP), of the type consisting of causing circuits of an information processing device (1, 3, 4) to calculate at least one signature (SG) of the file, by using at least one secret datum (S; Sd) specific to the signer, but unknown to him, memorized in a secret memory zone of a portable electronic object (4), having a memory and processing circuits, which is at the disposal of the signer, and linking the calculated signature to the primary file. The invention is also characterized in that when each signature is calculated, it may further use at least one portion of the primary file, such that the signature is a function of the secret datum of the signer and of each portion handled of the file, and creating a secondary file (FS) and writing in it at least information (IN) enabling identification of each portion of the primary file that was used to calculate this signature, and linking the secondary file with the corresponding signature, on the one hand, and with the signed file, on the other.

Method for signature of an information processing file, and apparatus

The invention relates to a method and apparatus for checking the integrity of a message such as a program and/or data against an original message supposed to correspond to it. By using an algorithm (A) on at least part of the original message, at least one signature (S1, S2, . . . Sm) of this part is calculated and memorized in a memory area (10) of a portable object (1) which also has processing circuits (11) able to implement algorithm (A). In order to check the integrity of a message, at least one signature of a message part is calculated by the processing circuits (11) of the portable object by implementing the algorithm (A) and is compared to an original message signature supposed to correspond, and memorized in memory area (10).

Method for checking the integrity of a program or data, and apparatus

Security device, including a memory and/or a microcomputer for data

Method for authenticating an external authorizing datum by a portable

A method and apparatus for certifying services obtained with the aid of a portable carrier such as a memory card. A portable carrier (2) such as a credit card is adapted to be connected to an apparatus (1) that calculates a visual record or certificate (C), composed of a result (R) and parameters (PI, PE) necessary for calculating the result. This result is calculated by processing circuits (T2) in the card (2) under the control of a program (P2) recorded in its memory (M2) and of a secret key (S). The result emitted after a service has been furnished can then be recalculated, to certify that the service has been furnished. r

Method and apparatus for certifying services obtained using a portable

One chip microprocessor, which is more particularly designed to execute culation algorithms of a public code encoding system formed by a public function and a secret inverse function of the type comprising at least one programmable read-only memory, a processing unit and an input/output device, wherein it comprises a memory, in which is recorded at least one algorithm corresponding to the performance of said secret function, and wherein the programmable read-only memory contains the secret parameters constituting the secret code and recorded in an area of the read-only memory which is inaccesible from the outside, the processing unit including the multiplying circuits necessary for the execution of the algorithm.

Microprocessor intended particularly for executing the calculation

The invention relates to a security device (1) prohibiting the execution of at least one function of an electronic data processing unit (2) after a first cutoff of its electric power even in the case of a resumption of supply voltage. This device includes a first means (8) that functions only once in the course of a period beginning at the instant (T.sub.0) of a first connection to voltage by the power supply (3), and finishing prior to the instant (T.sub.2) of a first cutoff of this power supply, and a second means (10) connected to the output of the first means (8) and furnishing an inhibiting signal having a first level that authorizes the function of the unit, from the instant (T.sub.0) of the first connection to voltage until the instant (T.sub.2) of the first cutoff, this inhibiting signal having a second level that prohibits said execution of said function beginning at the instant (T.sub.2) of the first cutoff, this inhibiting signal maintainin this second level even in the case of a resumption of voltage.

Security device prohibiting the function of an electronic data

The invention relates to a method and an apparatus for authorizing the holder of a portable object such as a card to gain access with this card to at least one service provided by at least one authorizing entity. According to the invention, the method enables the holder of a card C to become authorized to have access to a particular service by causing an authorizing datum to be written on his card C by an authorizing system T, causing the calculation by both the card C and the system of a result taking into account at least one secret datum S, comparing in a comparator CC of the card the results calculated, and validating the authorizing datum if the results are identical.

Method and apparatus for authorizing the holder of a portable object

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.

Growing community of inventors

Maurepas, France

Michel Ugon