I need to make a system which certifies that documents sent through a portal are valid.

This is the idea:

1.- User registers in the portal via web
2.-The server gives a certificate for the user.
3.-The user can  then send certified documents, and the validity can be checked by end users in the Institution which receives them.


I'm rather new in certificates, but I think It can be done with OpenSSL.
We're thinking in developing the portal in Java or Perl, but our problem now is how to define the security scheme, and what tools we will use.

So I ask, can the certificates part be acomplished totally with OpenSSL? Is there an API for Java or Perl?

This is what I'm thinking in terms of servers:


{End User}
|
|
{Internet}
|
|
{Web Server}<-->{Certificates Server}
|
|
{Administrative people} Receives and check documents


Is OpenSSL adequate for this case?
What size of key and algorithm would you recommend?
Well, I'll keep investigating, any help is welcome.

Thanks,

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Omar Armas    
MPSNet

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