Information system for managing at least one digital certificate from an end user in electronic transactions, comprising: - a server a client and a workstation operable by a end user, wherein: - the client is adapted to receive by the end user a request an electronic transaction;- the client is adapted to require identification information to the end user; - the client is adapted to establish a communication with the server; - the client is adapted to send a request to the server for an electronic transaction on behalf of the end user comprising the identification information; and further characterised in that: - the server is adapted to send to the end user workstation an installation request to download and execute a gateway application adapted to provide the server with a digital certificate; - the server is adapted to obtain at least one valid digital certificate suitable for performing the electronic transaction, by means of the gateway application; - the server is adapted to obtain trusted information about the end user from one or more certification authorities by means of one or more digital certificates; - the server is adapted to send to the client the trusted information obtained from the certification authorities. - a server a client and a workstation operable by a end user, wherein: - the client is adapted to receive by the end user a request an electronic transaction;- the client is adapted to require identification information to the end user; - the client is adapted to establish a communication with the server; - the client is adapted to send a request to the server for an electronic transaction on behalf of the end user comprising the identification information; and further characterised in that: - the server is adapted to send to the end user workstation an installation request to download and execute a gateway application adapted to provide the server with a digital certificate; - the server is adapted to obtain at least one valid digital certificate suitable for performing the electronic transaction, by means of the gateway application; - the server is adapted to obtain trusted information about the end user from one or more certification authorities by means of one or more digital certificates; - the server is adapted to send to the client the trusted information obtained from the certification authorities. - the client is adapted to receive by the end user a request an electronic transaction;- the client is adapted to require identification information to the end user; - the client is adapted to establish a communication with the server; - the client is adapted to send a request to the server for an electronic transaction on behalf of the end user comprising the identification information; and further characterised in that: - the server is adapted to send to the end user workstation an installation request to download and execute a gateway application adapted to provide the server with a digital certificate; - the server is adapted to obtain at least one valid digital certificate suitable for performing the electronic transaction, by means of the gateway application; - the server is adapted to obtain trusted information about the end user from one or more certification authorities by means of one or more digital certificates; - the server is adapted to send to the client the trusted information obtained from the certification authorities. - the server is adapted to send to the end user workstation an installation request to download and execute a gateway application adapted to provide the server with a digital certificate; - the server is adapted to obtain at least one valid digital certificate suitable for performing the electronic transaction, by means of the gateway application; - the server is adapted to obtain trusted information about the end user from one or more certification authorities by means of one or more digital certificates; - the server is adapted to send to the client the trusted information obtained from the certification authorities.