Devices for the electronic receipt of requests for participation and tenders must at least guarantee, through appropriate technical means and procedures, that:

(a) electronic signatures relating to requests to participate and tenders comply with national provisions adopted pursuant to Directive 1999/93/EC;

(b) the exact time and date of the receipt of requests to participate and tenders can be determined precisely;

(c) it may be reasonably ensured that, before the time-limits laid down, no-one can have access to data transmitted under these requirements;

(d) if that access prohibition is infringed, it may be reasonably ensured that the infringement is clearly detectable;

(e) only authorised persons may set or change the dates for opening data received;

(f) during the various stages of the contract award procedure, access to all data submitted, or to part thereof, must be possible only through simultaneous action by authorised persons;

(g) simultaneous action by authorised persons must give access to data transmitted only after the prescribed date;

(h) data received and opened in accordance with these requirements must remain accessible only to persons authorised to acquaint themselves therewith.