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Prepare and Measure Quantum Digital Signature (edit)
Revision as of 22:55, 18 September 2018
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== Functionality Description== | == Functionality Description== | ||
Digital Signatures (DS) allow for the exchange of messages from sender to multiple recipients, with a guarantee that the signature has come from a genuine sender. Additionally, it comes with the properties of 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, and non-repudiation, i.e at any stage after sending the message to one recipient, sender cannot deny having sent the message and corresponding DS. | Digital Signatures (DS) allow for the exchange of messages from sender to multiple recipients, with a guarantee that the signature has come from a genuine sender. Additionally, it comes with the properties of 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, and non-repudiation, i.e at any stage after sending the message to one recipient, sender cannot deny having sent the message and corresponding DS. | ||
'''Tags:Multi Party (three), Digital Signature, Quantum Enhanced Classical Functionality, Specific Task''' | |||
== See Also == | |||
[[Quantum Digital Signature|Quantum Digital Signature (QDS)]], [[Measurement Device Independent Quantum Digital Signature|Measurement Device Independent Version (MDI-QDS)]],[[Measurement Device Independent Quantum Digital Signature|Device Independent Version(DI-QDS)]], [Quantum Key Distribution|QKD],[[Quantum Enhanced Classical Functionality|Quantum Enhanced Classical Functionality]] | |||
==Outline== | ==Outline== | ||
Quantum Digital Signature protocols can be separated into two stages: the distribution stage, where quantum public keys are sent to all recipients, and the messaging stage, where classical messages are sent and verified. Here, we take the case of three parties, one sender (referred to as seller) and two receivers (buyer and verifier) sharing a one bit message. Following protocol requires Client to prepare and send quantum public keys to the buyer and verifier, hence the name, ''Prepare and Send QDS''. | Quantum Digital Signature (QDS) protocols can be separated into two stages: the distribution stage, where quantum public keys are sent to all recipients, and the messaging stage, where classical messages are sent and verified. Here, we take the case of three parties, one sender (referred to as seller) and two receivers (buyer and verifier) sharing a one bit message. Following protocol requires Client to prepare and send quantum public keys to the buyer and verifier, hence the name, ''Prepare and Send QDS''. | ||
''Distribution phase can be divided into the following steps:'' | ''Distribution phase can be divided into the following steps:'' | ||
*''' Key Distribution:''' Seller generates her (public key,private key) pair and shares the public key with both receivers in this step. For each possible message (0 or 1), she generates two identical sequences/copies (one for each receiver per possible message) of randomly chosen BB84 ∈ {0,1,+,−} states. The sequence of states is called quantum public key and its classical description, private key. She then sends copies of each quantum public key to the receivers while keeping both the private keys secret to herself. At the end of this step, seller has two private keys, one for each possible message. Similarly, each receiver has two quantum public keys, one for each possible message. | *''' Key Distribution:''' Seller generates her (public key,private key) pair and shares the public key with both receivers in this step. For each possible message (0 or 1), she generates two identical sequences/copies (one for each receiver per possible message) of randomly chosen BB84 ∈ {0,1,+,−} states. The sequence of states is called quantum public key and its classical description, private key. She then sends copies of each quantum public key to the receivers while keeping both the private keys secret to herself. At the end of this step, seller has two private keys, one for each possible message. Similarly, each receiver has two quantum public keys, one for each possible message. | ||