ELFT HÍRADÓ

[Andras Palyi <palyi.andras AT ttk.bme.hu>]

Dear Colleagues, 

On Thursday we host the following talk:

    Máté Galambos (BME VIK)
    Position Based Cryptography and Teleportation Attacks

online in Teams
2021 Oct 14, 11:15
Abstract: see below

Teams link:
https://teams.microsoft.com/l/meetup-join/19%3a897924ab922a49bd9c682451a94eb00d%40thread.tacv2/1634050383133?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22f8b27e90-dbca-4bb5-813c-d6415577ec35%22%7d

Best regards,
Andras Palyi
BME Institute of Physics, Department of Theoretical Physics

= = = 

Quantum Key Distribution (QKD) is currently the leading application of 
quantum communication. However the question remains: can we use quantum 
communication for some other purpose in the future? One proposal beyond QKD 
is Position Verification, where multiple trusted parties (so called 
verifiers) check whether a distant, willing communication partner (so called 
prover) is telling the truth about his geographical position. Position 
Verification however does not have the unconditional security QKD has. We now 
know that with enough quantum resources any Position Verification scheme can 
be attacked using an elaborate teleportation process. Yet the best currently 
known universal attack is prohibitively resource intensive. This means, 
Position Verification current has practical security much like RSA 
encryption. In my talk, I will present the current state of research in this 
field. I will introduce a general algorithm of Position Verification, and why 
it requires quantum communication. I will talk about a teleportation method 
discovered in the last ten years (called Port Based Teleportation), why it is 
a unique computational tool, and how could it be used to attack Position 
Verification. Finally–if time permits–I will talk about my own work: if 
Position Verification is secure under some assumptions, how could we use it 
to track the position of valuable data (such as a diplomatic package or 
nuclear launch codes). This research was supported by the Ministry of 
Innovation and Technology and the National Research, Development and 
Innovation Office within the Quantum Information National Laboratory of 
Hungary.