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SUMMARY:Quantum digital signatures - Erika Andersson (Heriot Watt)
DTSTART:20140522T131500Z
DTEND:20140522T141500Z
UID:TALK52712@talks.cam.ac.uk
CONTACT:Adrian Kent
DESCRIPTION:Digital signatures ensure that messages cannot be forged or ta
 mpered with. They\nare widely used to provide security for electronic comm
 unications\, for example\nin financial transactions and electronic mail. I
 mportantly\, signed messages are\nalso transferrable\, meaning that if one
  recipient accepts a message as genuine\,\nthen she is guaranteed that oth
 ers will also accept the same message if it is\nforwarded. Digital signatu
 res are different from encryption\, which guarantees\nthe privacy of a mes
 sage.  Currently used classical digital signature schemes\,\nhowever\, onl
 y offer security relying on unproven computational assumptions. In\ncontra
 st\, quantum digital signatures (QDS)\, similar to quantum key distributio
 n\n(QKD)\, offer information-theoretic security based on principles of qua
 ntum\nmechanics. A serious drawback of previous QDS schemes is however tha
 t they\nrequire long-term quantum memory\, making them unfeasible. We pres
 ent protocols\nwhich do not need quantum memory and which use only standar
 d linear optical\ncomponents and photodetectors. With this\, it seems that
  QDS and QKD are similar\nin terms of experimental requirements. Important
  work remains in investigating\nwhich QDS schemes are most suited for real
  applications\, and in completing full\nsecurity proofs.\n\n
LOCATION:MR4\,  Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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