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Certifier, according to different legislation. The CA issues and guarantees the authenticity of
Digital Certificates. A Digital Certificate includes the public key or other information related
to the public key.
- A Registration Authority (RA – English acronym) – validates Digital Certificates requirements.
The RA authorizes the issue of the public key certificate to the requiring individual by the
Certification Authority.
- A certificate management system – a software application provided the PKI vendor.
- A directory where certificates and their public key are stored.
- A Digital Certificate includes the name of the signer and his/her public key, the digital
signature of the Certification Authority that issues the certificate, a series number and the
expiration date.
- Subscribers: the individuals or entities mentioned or identified on the public key certificates,
the holders of private keys corresponding to the public keys of the digital certificates.
- Users: the individuals who validate the integrity and authenticity of a digital document or
data message, based on the signatory digital certificate. (BUGONI, RIVOLTA; 2007), (RIVOLTA;
2008), (RIVOLTA; 2010)
Definition of a digital signature
We are now going to analyze the process of digitally signing an electronic document. In line
with Argentine Law, the process to digitally sign an electronic document has two stages:
- A first step when the subscriber/holder of a digital certificate digitally signs an electronic
document
- A second step when a third party, the receiver of that digitally signed electronic document
checks for the message authorship and integrity.
Digital signatures are an important application of this public key technology. In effect, the
individual who sends a message uses his/her private key to encrypt the secure message digest
(obtained through the calculation of the message hash function). That individual sends the
encrypted digest and its digital certificate which has the public key. El receiver decrypts the
digest using the sender’s public key, which matches the private key of it. The receiver of the
message checks the digital signature of that message, for which recalculates its hash function,
and if both match checks that the message has not been tampered with, process through which
the receiver has certainty of its integrity. If the receiver could decrypt the digest by means of
the public key corresponding to the sender of the message, the receiver checks the authorship
of the digitally signed electronic document. (BUGONI, RIVOLTA; 2007), (RIVOLTA; 2008),
(RIVOLTA; 2010)
Technological Standards
The same as in other environments, public key technologies are supported on standards. As
public key initiatives and infrastructures increase in number, modifications to the standards
initially used have to be implemented to enlarge their functionality or to make them more
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