need a programmer and expert in cryptography algorithms / digital signature to make this apps

the disposition of letter (in pdf) system uses digital signatures algorithm (2 algorithms are analyzed and compared) disposition = assign system mechanism 1 users login using the username and password and are available remember password 2. The user can see can see some menu. a) My disposition: This menu contains a list of letters assigned by the user to another. users can delete disposition disposition owner may not alter the disposition that has been sent to other employees. users can see a list disposition with field titles, file file, from, to, date of disposition, disposition, disposition and historical information as well as the disposition status (pending, process and done), a type of digital signature algorithm used Also on the menu the user can search by title and filter disposition date and see more details of the disposition, download a letter to the disposition and can also remove the disposition b) the disposition to me assigned contains a letter to the employee who is being logged. almost the same with my disposition menu above but add two buttons -button update: to update the status of the letter and a description (text area). mail status is pending, process, done. date status updates are recorded automatically by the system. - Button disposition: the user can use the button to move the letter didisposisikan to himself to other employees. The user pours employees who want assigned and disposition information. The disposition date will be recorded into a database so that it can ditracking displacement disposition of employee A to B and from employee to employee and employee C. type of digital signature algorithms used shall be selected when sending disposition .. non-users as the original owner of the letter / disposition can not remove the disposition -if users have another employee to dispose of the disposition will automatically disappear from the menu for my disposition and will move to my disposition. c) add disposition: disposition-users input the title and then next button is clicked will go directly to the camera to capture the document as a document scanner can add page and remove the page and then click Next all capture / scan converted to pdf . and next page is to make disposition information, employees who want dispositioned and digital signature algorithms that are used to transmit data .. once clicked the send button it will appear like a step delivery process step of the process according to the algorithm used an example of an algorithm A generate key later stage mathematical calculations will appear (modulo and iteration) and ends with her longtime process in the use of digital signature algorithms are algorithms A sample using 30 second, 1 ms .. sucess after which it will process window will close and the inputted data will appear on the tab of my disposition d) pending menu: a menu that gave rise to the status of pending disposition is comprised of the tab. -disposisi I: contains a list of disposition status pending disposition and the disposition of these employees -disposisi to me: contains a list of dispositions didisposisikan to the employee and the process status: pending e) the menu: a menu that gave rise to the status of disposition is a process consisting of the tab. -disposition : contains a list of disposition status of the disposition process and the disposition of these employees -disposition to me: contains a list of dispositions didisposisikan to the help desk and the status of the process: the process f) menu done: menu which gave rise to the status of disposition is done which consists of tabs. -disposition: contains a list of disposition disposition status is done and the disposition of these employees -disposition to me: contains a list of dispositions didisposisikan to the employee and the process status: done g) logout: to go out and destroy -every page has a search disposition - Any disposition process there are two algorithms for digital signature that can be used. free algorithm but can also choose dsa and rsa algorithm. The algorithm processes running can be seen (and overall calculation step along time until the process is successful) as the above information I need a programmer and expert in cryptography algorithms / digital signature thank you