GlobalSign is one of the largest certificate authority(CAs). GlobalSign’s core PKI services allow its thousands of authenticated customers to conduct SSL secured transactions, data transfer, distribution of tamper-proof code, and protection of online identities for secure email and access control. Additionally GlobalSign’s PKI services include a trusted root chaining program for trusted PKI deployments, which allows the widely distributed and trusted GlobalSign root CA certificates to cryptographically chain subordinate root CAs for use in Microsoft CA and other in-house CAs. Such chaining allows these non-commercial CAs to control their own internal PKI, typically issuing SSL and digital IDs for secure email and two factor authentication.