[Pki-users] Security Modules for PKI RA

Hi, I can configure the pki-ca subsystem on a fedora 8 and the security module found is "Internal Key Storage Token". But when i'm trying on the same system to configure the pki-ra subsystem, i can't go further than the security module page. The 3 modules listed (NSS, nCipher and SafeNet) are marked not found. Do I have to activate something else to get a module found on the system ? Thx