As time goes by, the epicentre of the world is increasingly shifting towards information technology with more than 5 billion people connected in 2010, i.e. 70% of the world's population. With the development of ICTs, we see the growth of crime, which is becoming more and more sophisticated with the help of information technology. This is of interest to criminal investigation officers because of the clues that can be drawn from their investigations. As part of the fight against crime, judicial police officers issue requisitions to operators in order to obtain information that can help in investigations. Unfortunately, this process is carried out manually through administrative correspondence, which has many drawbacks, including slowness and security breaches. In this context, the actors involved in this process are entitled to ask themselves whether this process can be automated and made more secure. As a result of our work, we have designed and implemented a secure requisition processing system.