BEGIN:VCALENDAR VERSION:2.0 PRODID:ILLC Website X-WR-TIMEZONE:Europe/Amsterdam BEGIN:VTIMEZONE TZID:Europe/Amsterdam X-LIC-LOCATION:Europe/Amsterdam BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:19700329T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:19701025T030000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE 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
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.
\n \nFor more information, contact Chri
stian Schaffner (c.schaffner