Abstract: A method of protecting a telecommunication terminal having a chip-card-type personal component which is required for telecommunication network access. The terminal includes a processing unit, at least one operating memory element containing the information necessary to the operation of the terminal, i.e. a terminal operating program, and the data necessary to the program. The method involves: a) encrypting the contents of the operating memory element of the telecommunication terminal using a pre-determined key K which is necessary for decryption; and b) allowing the terminal to commence decryption once the terminal has been started with a start-up program that is saved in a secure memory element and once the key for decryption has been calculated by same.

Abstract: The invention relates to the securing of information media so as to prevent any alteration or modification of the identification information and the fraudulent reuse of the media. The identification document according to the invention comprises personalisation information placed on at least one of its main sides, and invisible anti-forgery means placed on at least part of the said side and designed to undergo a change in appearance in the event of an attempt to do additional personalisation.

Abstract: A method for preventing secret code manipulation in a data processing device, such as a smart card, to which a presented code is applied. Prior to implementation of a code transforming function in the processing device, the secret code is transformed into a transformed secret code in the card. For each use of the card, the presented code is transformed into a transformed presented code in accordance with the implemented transformation function. A comparison of the transformed secret code with the transformed secret code in the card is then performed.

Abstract: An entity of the smart card type has an application layer linked to a communication protocol layer. A time manager containing a timer interfaces with the protocol layer. The time manager substantially periodically constructs waiting time extension requests transmitted to a terminal through the protocol layer as long as data are being processed in the application layer. The application layer is thus freed from any time constraint.

Abstract: The present invention relates to the field of securing and protecting the execution of a source code by a processing unit of an item of electronic equipment, as well as the associated devices, for example chip cards. The invention presents a method for securing the execution of a source code by a processing unit of an item of electronic equipment, the method comprising steps of inserting dummy operations, in which some of the dummy operations do not execute in full.

Abstract: In a data processing device, a first key is produced based on a secret key so that the latter is never used in a clear form. In a preliminary step, the secret key and a random number are applied to a function producing a first key. The first key and the random number are pre-stored in the device. For each data processing, the first key and another random number are applied to another function to produce a second key, and the second key and the stored number are applied as inverse of the function to produce a third key used for processing the data. The device can be a smart card and the data the confidential code presented to the card.

Abstract: A method of protecting a telecommunication terminal having a chip-card-type personal component which is required for telecommunication network access. The terminal includes a processing unit, at least one operating memory element containing the information necessary to the operation of the terminal, i.e. a terminal operating program, and the data necessary to the program. The method involves: a) encrypting the contents of the operating memory element of the telecommunication terminal using a pre-determined key K which is necessary for decryption; and b) allowing the terminal to commence decryption once the terminal has been started with a start-up program that is saved in a secure memory element and once the key for decryption has been calculated by same.

Abstract: An entity of the smart card (CP) type, having an application layer (AP) linked to a communication protocol layer (PR), comprises a time manager (GD) containing a timer (CD) interfacing with the protocol layer (PR) for substantially periodically constructing waiting time extension (WTX) requests transmitted to a terminal (TE) through the protocol layer as long as data are in the process of being processed in the application layer. The application layer is thus freed from any time constraint.

Abstract: The invention concerns a method aimed at preventing secret codes manipulations is a data processing means, such as a smart card (CA), by applying thereto a presented code. The method for accessing a functionality of the card comprises prior to implementation (E1) of a code transforming function (FT) in the processing means (CP), transformation (E2) of the secret code (CS) into a transformed secret code (CST) in the card. For each use of the card are provided transformation function, and a comparison (E7) of the transformed secret code with the transformed secret code in the card.

Abstract: In a data processing device (DTD), a first key (K1) is produced based on a secret key (K) so that the latter is never used in clear. In a preliminary step, the secret key (K) and a random number (R1) are applied (I2) to a function (F1) producing the first key (K1). The first key and the random number are pre-stored (I3) in the device. For example, for each data (BD) processing (ET), the first key and another random number (R2) are applied (E2) to another function (F2) to produce a second key (K2), and the second key and the stored number (R1) are applied (E3) as inverse (F1−1) of the function (F1) to produce a third key (K3) used for processing the data, properly speaking. The device can be a smart card and the data the confidential code presented to the card.

Abstract: Data in a write request (RE1) transmitted by a processor (PR) to a read/write controller (CM) must be written in a non-volatile memory (MNV) in a portable electronic object, such as a smart card. An application can be executed in the processor simultaneously with the writing of the data in the memory in response to an acknowledgement (AC) indicating the availability of the controller for writing. However, another write request transmitted before the end of the writing is put on standby until the end of the writing. The controller also provides a verification of integrity of the data to be written in the memory.

Abstract: The invention relates to a storage system including at least one non-volatile memory containing information likely to be updated, and more particularly, to storage supports such as chip cards. The invention likewise relates to a process of management of the memory. According to the invention, the system includes a memory manager that is able to displace all or a portion of the contents of the memory respectively over all or a portion of the memory, in order to limit the attrition of memory cells due to the frequent updating of certain data.