This presentation will give you a broad view about digital signature and certificate authority. It also explains the difference between digital signature and electronic signature.

1. DIGITAL SIGNATURE AND
CERTIFICATE AUTHORITY
KRUTI D SHAH
MFT 1716

2. WHAT IS A DIGITAL SIGNATURE?
A digital signature is a mathematical technique used to validate
the authenticity and integrity of a message, software or digital
document.
The digital equivalent of a handwritten signature or stamped
seal, a digital signature offers far more inherent security, and it is
intended to solve the problem of tampering and impersonation
in digital communications.

3. FEATURES
Guarantees the authenticity of an electronic document or message in digital communication,
uses encryption techniques to provide proof of original and unmodified documentation.
Used in e-commerce, software distribution, financial transactions and other situations that
rely on forgery or tampering detection techniques.
Are like electronic “fingerprints.” In the form of a coded message, the digital signature
securely associates a signer with a document in a recorded transaction.
Use a standard, accepted format, called Public Key Infrastructure (PKI), to provide the highest
levels of security and universal acceptance.

4. HOW DOES IT WORK?

5. Basis Digital Signature Electronic Signature
Purpose The main purpose of a digital signature
is to secure a document so that it is not
tampered with by people without
authorization
An electronic signature is mainly used to
verify a document. The source of the
document and the authors are
identified.
Regulation Authorized and regulated by
certification authorities. These are
trusted third parties entrusted with the
duty to perform such task.
Are not regulated and this is the reason
why they are less favorable in different
states since their authenticity is
questionable. They can be easily
tampered with.
Security Comprised of more security features
that are meant to protect the document
Is less secure since it is not comprised of
viable security features that can be used
to secure it from being tampered with by
other people without permission.

6. PROPERTIES OF DIGITAL SIGNATURE
Authentication
Non Repudiation
Verification
Easy and Quick
Data Integrity

7. WHAT IS CERTIFICATE AUTHORITY?
Digital signatures rely on public and private keys which have to be protected to
ensure safety and to avoid forgery or malicious use.
A certificate authority (CA) is a trusted entity that issues digital certificates,
which are data files used to cryptographically link an entity with a public key.
Certificate authorities are a critical part of the internet's public key
infrastructure (PKI) because they issue the Secure Sockets Layer (SSL)
certificates that web browsers use to authenticate content sent from web
servers.

8. USES OF CERTIFICATE AUTHORITY
The best-known use of certificate authorities is for issuing SSL certificates to entities that publish content
on the web.
The three different levels of trusted certificates include:
• Extended Validation (EV)
• Organization Validated (OV)
• Domain Validated (DV)

9. HOW TO OBTAIN A CERTIFICATE FROM A
CERTIFICATE AUTHORITY?

10. CERTIFICATE AUTHORITY HIERARCHY
CAs are hierarchical in
structure. There
are generally three types
of hierarchies, and they
are denoted by the
number of tiers.
Single/One Tier
Hierarchy
Two Tier Hierarchy Three Tier Hierarchy

11. THANK YOU!