A certification authority (CA) is an entity that issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. This allows others (relying parties) to rely upon signatures or on assertions made about the private key that corresponds to the certified public key. A CA acts as a trusted third party—trusted both by the subject (owner) of the certificate and by the party relying upon the certificate.

A public key infrastructure (PKI) is an arrangement that binds public keys with respective identities of entities (like people and organizations). The binding is established through a process of registration and issuance of certificates at and by a certificate authority (CA).

BBCA issues certificates for Banks and Financial Institutions to fulfill the need for trusted third party services in Electronic Commerce by issuing Digital Certificates that attests to some fact about the subject of the certificate, which provides independent confirmation of an attribute claimed by a person offering a Digital Signature.

For securing the transactions through internet, BBCA provides high end Public Key Infrastructure (PKI) based services and solutions to individuals, organizations as well as governments, that enable trust and security. BBCA has set up a high-end, global standards- based processing Center, capable of issuing thousands of Digital Certificates, an important component of PKI. As a licensed Certifying Authority by the Controller of Certifying Authorities (CCA), Information and Communication Technology Division of Ministry of Posts, Telecommunications and Information Technology, Government of the People's Republic of Bangladesh, BBCA issues, administers and revokes the digital certificates which are trust worthy and legally valid under Information and Communication Technology Act, 2006.