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BEGIN:VEVENT
UID:/NewsandEvents/Archives/2015/newsitem/6734/16-
 February-2015-Theoretical-Computer-Science-Seminar
 -Andreas-Huelsing
DTSTAMP:20150212T000000
SUMMARY:Theoretical Computer Science Seminar, Andr
 eas Huelsing
ATTENDEE;ROLE=Speaker:Andreas Huelsing (TU Eindhov
 en)
DTSTART;TZID=Europe/Amsterdam:20150216T160000
DTEND;TZID=Europe/Amsterdam:20150216T170000
LOCATION:CWI room L017, Science Park 123, Amsterda
 m
DESCRIPTION:Abstract: Hash-based signatures are cu
 rrently the most confidence-inspiring replacement 
 for the signature schemes used today. Their securi
 ty is solely based on the security of the used has
 h function(s) and can be related to the same by me
 ans of standard-model security reductions. Today's
  hash-based signature schemes have performance clo
 se to that of RSA & Co and are currently subject t
 o standardization. The only drawback of hash-based
  signature schemes in practice is that they are st
 ateful, i.e., the secret key has to be updated aft
 er each signature. However, recent results show th
 at this problem can actually be solved while maint
 aining practical performance and reliable security
 . This talk will discuss the basics of hash-based 
 signature schemes. It will cover one-time and many
 -time signature schemes, Lamports scheme, the Wint
 ernitz OTS, Merkle's scheme, and XMSS. Finally, it
  will be explained how to build practical stateles
 s hash-based signature schemes, explaining the con
 cept of few-time signature schemes and introducing
  SPHINCS.  For more information, contact Christian
  Schaffner (c.schaffner at uva.nl)
X-ALT-DESC;FMTTYPE=text/html:\n        <p>Abstract
 : Hash-based signatures are currently the most con
 fidence-inspiring replacement for the signature sc
 hemes used today. Their security is solely based o
 n the security of the used hash function(s) and ca
 n be related to the same by means of standard-mode
 l security reductions. Today's hash-based signatur
 e schemes have performance close to that of RSA &a
 mp; Co and are currently subject to standardizatio
 n. The only drawback of hash-based signature schem
 es in practice is that they are stateful, i.e., th
 e secret key has to be updated after each signatur
 e. However, recent results show that this problem 
 can actually be solved while maintaining practical
  performance and reliable security. This talk will
  discuss the basics of hash-based signature scheme
 s. It will cover one-time and many-time signature 
 schemes, Lamports scheme, the Winternitz OTS, Merk
 le's scheme, and XMSS. Finally, it will be explain
 ed how to build practical stateless hash-based sig
 nature schemes, explaining the concept of few-time
  signature schemes and introducing SPHINCS.</p>\n 
    \n        <p>For more information, contact Chri
 stian Schaffner (<a class="email">c.schaffner <spa
 n class="at">at</span> uva.nl</a>)</p>\n    
URL:/NewsandEvents/Archives/2015/newsitem/6734/16-
 February-2015-Theoretical-Computer-Science-Seminar
 -Andreas-Huelsing
END:VEVENT
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