Implementation of digital signature
It is computationally expensive to public-key-encrypt long messages. The goal is to have a fixed-length, easy to compute digital “fingerprint”, and then to apply hash function H to m, get fixed size message digest, H(m). MD5 and SHA-1 are hash functions widely used.
Digital signature is a signed message digest:
Figure 37 Operation of a digital signature and its verification
Click to enlarge
Diagram illustrating how a simple digital signature is applied and verified by Acdx (Own work) from Wikipedia CC BY-SA 3.0
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Project
Contact
This resource was developed as part of an Erasmus+ project, funded with support from the European Commission under grant agreement 2016-1-SE01-KA203-22064.
The project was a collaboration between:
- The University of Borås, Sweden
- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
This resource has been released under Creative Commons license CC-BY-SA 4.0.
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- Academic content – The University of Alcalá (https://www.uah.es/en/)
- Technical resource development – The University of the Highlands and Islands Educational Development Unit - EDU (edu@uhi.ac.uk)
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