Quantum Digital Signature

Functionality

Digital Signatures (DS) allow for the exchange of single or multiple bit classical messages from sender to multiple recipients, with a guarantee that the signature has come from a genuine sender. It comes with the properties of (i) transferability, i.e. messages with DS can be forwarded from one recipient to another such that DS is verifiable to have come from the original sender, (ii) non-repudiation, i.e at any stage after sending the message to one recipient, sender cannot deny having sent the message and corresponding DS, and (iii) unforgeability, i.e. a dishonest recipient cannot alter or fake the sender's DS and forward it to other recipients successfully.

Use Case

Signing E-Marksheets, Online Transactions

Tags: Multi Party, Quantum Enhanced Classical Functionality, Specific Task

Protocols

• Single bit messages
• Multiple-bit messages
• Prepare and Measure Quantum Digital Signature
• Measurement Device Independent Quantum Digital Signature
• No quantum memory
• No authenticated/secure channel
• Blind Quantum Digital Signature

Discussion

(Review Papers)