Rupam Roy, a student of mechanical engineering at Modern Institute of Engineering & Technology, thanks his professor Mr. Souvik Nandi for the opportunity to present on the topic of cyber security. The presentation covered digital signatures in detail and helped students who were unfamiliar with the topic understand the concepts. It also benefited students without experience making PowerPoint presentations. Rupam thanked his parents, teachers, and classmates for their support.

1. Presented By- Rupam Roy a Student of Modern Institute of Engineering & Technology
Roll No- 26900720052
Reg No- 202690100720017
Department- B.tech In Mechanical Engineering
Subject- Cyber Security (OE-ME802J)
Year- 4th
Semester- 8th

2. We would like to express our sincere gratitude to our respected Sir “Mr. Souvik Nandi” for
providing us the opportunity of making such an interesting presentation. We would specially
thank him for all their invaluable guidance, creative suggestions, friendly interference
throughout the entire course of this project.
Though almost all of us are acquainted with “Types of Digital Signature”, the detailed
conceptions were not known to many of us, but now it’s largely eternalized throughout the
class.At the other side many of us knew about the basic significance of working with M.S.
PowerPoint but for those who were not prepared for such experiences, this project was
absolutely important and helpful.
We would also thank to our parents & class teachers for their inestimable guidance and also
thank to our classmates for their co-operation with us.

3. 1.Digital Signature is a type of electronic signature
that encrypts documents with digital codes that are
particularly difficult to duplicate
2.In case of digital signature message is encrypted
with the private key and decrypted with the public
key.

8. Digital Signature Algorithm

10. 1. Message digest is generated using a set of Hash functions.
2. Amessage digest is encrypted using senders private key.
3. The resulting encrypted message is known as digital
signature.
4. Digital signature is attached with data or message and send
to receiver.

11. 1.Receiver uses senders public key to decrypt senders digital
signature to obtain message digest send by receiver.
2.Receiver uses same message digest algorithm, which is used
by sender
3. Now, receiver will compare these two message digest
4. If message digest are equal then signature is valid else not.

12. ⦁ Authentication:
◦ Identification of person sign.
⦁ Integrity od data:
◦ Every change is detected.
⦁ Non Repudiation:
◦ Author has encrypted sign on message.
⦁ Speed:
◦ Contracts are easily written, completed, and signed by all
concerned parties in a little amount of time no matter how far the
parties are geographically.

13. ⦁ Expiry
⦁ Certificate issue procedures
⦁ Software compatibility