ldap server and acrobat

hello

i have a question

necessary to exchange documents with signatures between 2  enterprises. but we don't want to use CA (certification authority). we  have 2 variants:

1. ldap server.

as i see ldap server  contains all certificates from all users, f.e. Larina.fdf and Brown.fdf.  In Acrobat i have to create new directory server and when i want to  find new certificate and load it to Trusted identities - i'm looking for  it on ldap server with Manage trusted identities. But its manual work  for each certificate... maybe it can be automatize - in other words can i  load both of certificates Larina.fdf and Brown.fdf to trusted  identities automatically (maybe periodically)?

2. exchange folder.

or  we can use exchange folder for hold all certificates... but besides  process of load will not automated...

maybe you can consult another way to  automatize process of load certificates to trusted identities in  acrobat?

(  and i can't find trusted identities from acrobat in windows certificate  store... where i can find it?)