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SUMMARY:Semirings\, Semigroup Actions and their use for Cryptographic Prot
 ocols
DTSTART:20150219T141500
DTEND:20150219T151500
DTSTAMP:20260406T121556Z
UID:e80e73378b83147c17eaee4d03692133d11e3c0418635317eeb1589d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Joachim Rosenthal\nMany cryptographic protocols such as the Di
 ffie-Hellman key exchange and the ElGamal protocol rely on the hardness of
  the discrete logarithm problem in a finite  group. These algorithms are 
 then the basis for exchanging secret keys\, provide digital signatures or 
 authenticate some user.\nIn this talk we will give a generalization of the
  usual Diffie-Hellman key exchange and ElGamal protocols. Crucial for this
  generalizations will be semigroup actions on finite sets. Our main focus 
 point will be semigroup actions built from semi-rings and several examples
  will be provided.\nIn order to come up with new protocols it is desirable
  to study matrix semigroups over finite simple semirings and their actions
  on finite semimodules.
LOCATION:GR A3 30 http://plan.epfl.ch/?lang=en&room=GR+A3+30
STATUS:CONFIRMED
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