Computer Security
Delve into the world of digital signatures with a focus on their significance, the process involved, and the security they offer. Explore differences between conventional and digital signatures, understand the need for key management in digital signature processes, and grasp the applications and vulnerabilities associated with this cryptographic technique.
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Presentation Transcript
Computer Security CMPE 435 Semester II 2017 - 2018 Dr. Saman Mirza Abdullah saman.mirza@ishik.edu.iq
Class Objectives To define digital signature. To define security services provided by a digital signature. To define attacks on digital signatures. To discuss a digital signature scheme, RSA To describe some applications of digital signature. Computer Security - Ishik 3/2/2025 2
Introduction We are familiar with the concept of a signature before. A person signs a document to show that it originated from him or was approved by him. The signature is proof to the recipient that the document comes from the correct entity and nobody else. A sign of authentication: A verified signature on a document. A message can be signed electronically. The electronic signature can prove the authenticity of the sender of the message digital signature Computer Security - Ishik 3/2/2025 3
Comparison Conventional Signature Digital Signature (1) Inclusion Included in the document as part of the document. Send the signature as a separate document. (2) Verification Method Recipient compares the signature on the document with the signature on file. The recipient receives the message and the signature. The recipient needs to apply a verification technique to the combination of the message and the signature to verify the authenticity. (3) Relationship Normally a one-to-many relationship between a signature and documents. One-to-one relationship between a signature and a message. Duplicity A copy of the signed document can be distinguished from the original one on file. No such distinction unless there is a factor of time on the document Computer Security - Ishik 3/2/2025 4
Process of Digital Signature Computer Security - Ishik 3/2/2025 5
Process of Digital Signature Computer Security - Ishik 3/2/2025 6
Digital Signature Process Need of Key Computer Security - Ishik 3/2/2025 7
Process of Digital Signature Long Message Asymmetric key used for small size of message. Hash function used to reduce the size of message. Digest message is used for digital signature process. Computer Security - Ishik 3/2/2025 8
Note Computer Security - Ishik 3/2/2025 9
Digital Signature Services Computer Security - Ishik 3/2/2025 10
Authentication and Integrtiy Computer Security - Ishik 3/2/2025 11
Digital Signature Trusted Center Computer Security - Ishik 3/2/2025 12
Digital Signature Process Computer Security - Ishik 3/2/2025 13
RSA Digital Signature Computer Security - Ishik 3/2/2025 14
Digital Signature Scheme Computer Security - Ishik 3/2/2025 15
Digital Signature on Digest Message Computer Security - Ishik 3/2/2025 16
RSA Digital Signature Example Bob wants to send a message (9) to Alice as a digital signature. All details about public and private keys are given below: Bob (5,65) (29,65) Alice (3,33) (7,33) Public Key Private Key Computer Security - Ishik 3/2/2025 17
Class End Computer Security - Ishik 3/2/2025 18
