Abstract: The invention relates to a method for creating and transmitting a telephone call requested by a transmitting service to the telephone of a recipient, wherein a server of the transmitting service is capable of submitting a call request to a call server, the call request containing digital information enabling the call server to initiate a call to the telephone of the recipient using a calling number to be displayed on the telephone, wherein the call contains an enhanced voicemail, consisting of a voicemail constructed by the call server from a portion of the information contained in the call request and intended to be broadcast during the call, and additional non-voice information contained in the call request and used by the call server to form the calling number.

Abstract: A user provides an identifier to a computer server operating an online service by means of a network terminal connected to the computer server by a digital network. The user also provides a dynamic code that is to be used with the online service. The dynamic code is made up of a subset of digits that make up the number of a calling line, selected by a code server from among a set of available lines, so as to call the telephone of the user. The number for the dynamic code is transmitted to the online service by the code server. The dynamic code is extracted from the number for the calling line on the basis of an extraction rule indicated by the online service on the network terminal of the user.

Abstract: The invention relates to a method for the two-factor authentication of a user in an application service running on an application server. The first authentication factor is a PIN authentication code known only by the user and the application service, and the second authentication factor is the mobile communication terminal of the user on which is installed a reliability application obtained from a reliable third party or certified by the same. The reliability application is capable of generating, using the PIN authentication code and a secret key shared only with the reliable third party, a single use authentication code for each authentication of the user in the application service.

Abstract: The invention relates to a method for the digital signature of a message by a signer having an identity and holding a signature device, in which a public key cryptographic scheme is used. The signer has a public key and two private keys, the second private key being deposited at a reliable third party. For each signing operation, two additional steps are respectively carried out with a separate private key, i.e.: the calculation by the signer of a pre-signature of the message using the first private key, and transmitting the message and the pre-signature to the reliable third party; and the verification by the reliable third party of the pre-signature followed by the calculation by the reliable third party of a signature of the message using the second private key deposited at the reliable third party as well as the pre-signature previously calculated by the signer.

Abstract: The invention relates to a method for creating and transmitting a telephone call requested by a transmitting service to the telephone of a recipient, wherein a server of the transmitting service is capable of submitting a call request to a call server, the call request containing digital information enabling the call server to initiate a call to the telephone of the recipient using a calling number to be displayed on the telephone, wherein the call contains an enhanced voicemail, consisting of a voicemail constructed by the call server from a portion of the information contained in the call request and intended to be broadcast during the call, and additional non-voice information contained in the call request and used by the call server to form the calling number.

Abstract: A user provides an identifier to a computer server operating an online service by means of a network terminal connected to the computer server by a digital network. The user also provides a dynamic code that is to be used with the online service. The dynamic code is made up of a subset of digits that make up the number of a calling line, selected by a code server from among a set of available lines, so as to call the telephone of the user. The number for the dynamic code is transmitted to the online service by the code server. The dynamic code is extracted from the number for the calling line on the basis of an extraction rule indicated by the online service on the network terminal of the user.

Abstract: The invention relates to a method for the digital signature of a message by a signer having an identity and holding a signature device, in which a public key cryptographic scheme is used. The signer has a public key and two private keys, the second private key being deposited at a reliable third party. For each signing operation, two additional steps are respectively carried out with a separate private key, i.e.: the calculation by the signer of a pre-signature of the message using the first private key, and transmitting the message and the pre-signature to the reliable third party; and the verification by the reliable third party of the pre-signature followed by the calculation by the reliable third party of a signature of the message using the second private key deposited at the reliable third party as well as the pre-signature previously calculated by the signer.

Abstract: The invention relates to a method for the two-factor authentication of a user in an application service running on an application server. The first authentication factor is a PIN authentication code known only by the user and the application service, and the second authentication factor is the mobile communication terminal of the user on which is installed a reliability application obtained from a reliable third party or certified by the same. The reliability application is capable of generating, using the PIN authentication code and a secret key shared only with the reliable third party, a single use authentication code for each authentication of the user in the application service.