Ingenico Group

Mohammed Bellahcene

Jean-Jacques Delorme

Olivier Benoit

Christian Rolin

Jessica Royer

Jean-Christophe Pommaret

Laurent Muller

A method for the secured recording of data, implemented in a data-recording device having a first non-secured memory and a second secured memory, is disclosed. The method has the steps of: obtaining a derived key corresponding to the data in the second memory from a root key recorded in the second memory; encrypting data using the derived key, delivering encrypted data; recording the encrypted data in the first memory; determining a hash imprint of said data; recording said hash imprint in a hash file recorded in the first memory; recording a general hash imprint, representing the content of the hash file comprising said hash imprint, in the second memory; and eliminating the data in the second memory.

Method for the secured recording of data, corresponding device and program

A method for managing, by device, a matrix of keys, including at least one line and at least two columns, each key making short circuiting a line and a column when pressed. The method includes a sweeping phase, including, for each line: writing a predetermined logic value in the line; and for each column, reading a logic value in the column and comparing the read logic value and the predetermined logic value. For each line processed: the writing step is carried out during a predetermined time interval. For each column, the reading step is carried out during a first portion of the time interval. The sweeping phase further includes, for each column, writing the predetermined logic value in the column during a second portion of the predetermined time interval. The predetermined time interval is equal to the sum of the durations of the first and second portions.

Method and device for managing a key matrix, corresponding computer program product and storage device

There is proposed a method of managing an array of keys by a device, each key pressed short-circuiting a row and a column of the array. During at least part of a time slot lying between two successive iterations of a sweep phase, the device performs a first protection mechanism, including reading a logic value on at least one row or column, and detecting an attempted illicit sweep as a function of the logic value read, and/or a second protection mechanism, including writing an arbitrary logic value, equal to or different from the predetermined logic value, on at least one row or column, so as to prevent an attempted illicit sweep.

Method and device for managing an array of keys, with protection against an active spy device, computer program product and storage means corresponding thereto

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Lyons, France

Mohammed Bellahcene