Abstract: The invention relates to an electronic access pass allowing a person associated with the pass to access at least one restricted-access area of a building, and to a method implemented by such a pass for accessing a restricted-access area of a building. According to some embodiments, when a pass reader authorizes access to said area after reading the pass, information selected on the basis of the restricted-access area is temporarily displayed on the pass. This makes it possible to identify the carrier within the area based on the information displayed on the pass, while at the same time limiting the possibility of information being recovered through a simple glance outside the area. Overall security is thereby improved as a result, both within the area and outside it, due to the temporary nature of the display.

Abstract: The invention relates to an electronic access pass allowing a person associated with the pass to access at least one restricted-access area of a building, and to a method implemented by such a pass for accessing a restricted-access area of a building. According to some embodiments, when a pass reader authorizes access to said area after reading the pass, information selected on the basis of the restricted-access area is temporarily displayed on the pass. This makes it possible to identify the carrier within the area based on the information displayed on the pass, while at the same time limiting the possibility of information being recovered through a simple glance outside the area. Overall security is thereby improved as a result, both within the area and outside it, due to the temporary nature of the display.

Abstract: A method for determining a first integrity sum including the following steps: determining a first masked item of data by application of an “exclusive OR” operation between a first item of data and a first data mask; —determining a second item of data by application to the first masked item of data of a first cryptographic function, the second item of data being masked by a second data mask; —determining a second integrity sum associated with the second item of data by application to the second item of data of a checksum function; and determining the first integrity sum by application of an “exclusive OR” operation between the second integrity sum and a third integrity sum associated with the second data mask. A computer program and an electronic entity are also described.

Abstract: A method for determining a first integrity sum including the following steps: determining a first masked item of data by application of an “exclusive OR” operation between a first item of data and a first data mask; —determining a second item of data by application to the first masked item of data of a first cryptographic function, the second item of data being masked by a second data mask; —determining a second integrity sum associated with the second item of data by application to the second item of data of a checksum function; and determining the first integrity sum by application of an “exclusive OR” operation between the second integrity sum and a third integrity sum associated with the second data mask. A computer program and an electronic entity are also described.