?sf??e?a se ??t?f?? ???t?a

1
?sf??e?a se ??t?f?? ???t?a

• ?p. ??. ???sta?t???? ?apapa?a???t??
• conpap_at_di.uoa.gr

2
?? e??a?

• ???t?a ????? ?e?t???? d?a?e???s?
• ?e? ?p?????? sta?µ?? ß?s??, d??t?? ?a?????a???? ?
  d?a??µ?st?? (ß?. P2P).
• ?e? ?p?????? d?a?e???st?? d??t???
  (a?t?-d?a?e?????µe?a, a?t?-???µ???µe?a ?a?
  a?t?-?e?ape??µe?a)
• ???t?a p???ap??? sta?µ?? (multihop)
• ????t?? ??µß?? p?? ???s?µ?p????? t? as??µat? µ?s?
  ??a ep????????a
• S??e??? ?a? ap??sd???ta µetaßa???µe?? t?p?????a
  d??t???
• µeta????s? ??µß?? e?t?? t?? d??t???
• ??µß?? e?s?????ta? ?a? e??????ta? t?? d??t???

3
?fa?µ?????? ?te?, t? s?µe?a ?a? t? a????

• 1968 - ALOHA ?ata?eµ?µ??? d?a?e???s? p??sßas??
  se ?a????a
• 1973 PRnet (DARPA) d??t?? p???ap??? sta?µ??
  st? ?p??? ?? ??µß?? s??e??????ta? µeta?? t???
  ?ts? ?ste ??a µ???µa ?a ft?se? st?? p?????sµ? t??
• St?at??t???? a????e? ?ed?? µ????
• ?p??e???se?? d??s?s??
• ???t?a a?s??t???? (sensor networks)
• ???t?a p??s?p???? s?s?e??? (p.?. se s???d??a,
  s??a?t?se??, ??p.)
• Bluetooth
• ???t?a a?t?????t??

4
??d? ???µas?e?

• IETF Mobile Ad hoc NETwork (MANET)
  (http//www.ietf.org/html.charters/manet-charter.h
  tm)
• Personal Area Network (PAN)
• Connected Ad Hoc Network (CAN)
• e.g., 802.11 Independent Basic Service Set (IBSS)
  
• Autonomous Ad Hoc Network
• e.g., 802.11 Extended Service Set (ESS)
• ?a?a?t???st??? s?s?e???
• ???s?p????-f???t?? s?s?e??? (f???t?? ?p?????st??,
  ?p?????st?? ts?p?? (PDAs), a?s??t??e?)
• ?e?????sµ??? epe?e??ast??? ?s???, µ??µ? ?a?
  a?t???µ?a
• ????t???t?ta

5
?a?ade??µata
6
??p??e?e?

• ??a ded?µ??a ??a t?? a?t?µet?p?s? t?? ??as????
  p??ß??µ?t?? t?? asf??e?a?
• (a??e?t???p???s?, a?ta??a?? ??e?d???, ??p.)
• ?e? ?p???e? ??p??a µ??f? ?e?t????? a????
• ???sßas? se online d?a??µ?st?? ? ???a d??t?a
  ?e????te?a
• ??a??et??? d??aµ??? pe??ß????? (????t???t?ta,
• ?e?????sµ???? ?????? ???? d??t???
• ?e?????sµ??e? ??a??t?te? t?? ??µß??
  (epe?e??ast??? ?s???, µ??µ?, a?t???µ?a,
  d??at?t?ta ep????????a?)
• ?? ??µß?? µp??e? ?a a??µa??t?s????, ??ap???, ??p.

7
?pe????

• ?p?µ?µ?s? (spoofing)
• ????s? e??p???t?s?? (DoS)
• ??e? µ??f?? ape????
• Ota???st?? (Eavesdroppers)
• ????s? e??p???t?s?? ??µß?? (p.?. ?ata????s?
  e????e?a?)
• S?µpe??f??? a?????? t?? p??ß??µat?? t??
  ???a?t???? St?at????
• ?d??t??e?a (selfishness) ????s? s??e??as?a?
• ?ataß???e? (sinkholes)

8
?sfa??? ???µ?????s?

• ?p???se??
• ?a?a????s? d??µ?????s??
• ???d?s? ?a??asµ???? p????f????? d??µ?????s??
• ??????? d??µ?????s??
• ?a??e? ?a? ???? t??pe?
• ????t??s? p????
• ???te???µe?e? ??se??
• SEAD s??a?t?se?? s??????
• Ariadne a??e?t???p???s? µ???µ?t?? d??µ?????s??
  µe ???s? d?aµ???a??µe??? µ?st???? ? ??f?a???
  ?p???af??
• ARAN ??f?a?? p?st?p???t???
• SAODV ??f?a??? ?p???af?? ?a? s??a?t?se?? s??????

9
?pa?t?se?? ?sf??e?a?

• ?? apa?t?se?? s?et???? µe a??e?t???t?ta,
  eµp?ste?t???t?ta, a?e?a??t?ta, d?a?es?µ?t?ta ?a?
  µ? ap?p???s? e??a? ???st??.
• ?? ßas??? p??ß??µa e??a? ? eµp?st?s???

10
?µp?st?s???

• ?e?t???? ?µp?st? ??t?t?ta
• p.?. CA
• de? e??a? p??ta d?a??s?µ?
• ?at?tµ?s? d??t??? (clustering)
• ??a??µ? ??e?d??? p??? t? s??µat?sµ? t?? d??t???
• Fa???µe?? ?e?ss?? (?e?ss?? a??stas??)
• ???t??a ?p??????

11
??a?e???s? ??e?d???

• ??aµ???asµ?? eµp?st?s????
• ??aµ???a??µe?a S?st?µata ??a?e???s?? ??e?d???
• PGP
• ???pt???af?a ?at?f????
• ???pt???af?a ?at?f???? (n, t1)
• n ??µß?? µ???????ta? t?? ??a??t?ta
  p?a?µat?p???s?? µ?a? ???pt???af???? ?e?t?????a?
  (p.?. ??f?a?? ?p???af?)
• t1 ??µß?? µp????? ?a s??e??ast??? ??a ?a
  p?a?µat?p???s??? t? ?e?t?????a a?t?
• ???a? ad??at? ??a t ??µß??? ?a ?????? ??t? t?t???

12
?a??de??µa ?p???af? ??st?p???t????

• n ??µß?? µp????? ?a ?p????f??? p?st?p???t???
• ? s???e???µ??? ?p??es?a µp??e? ?a a?e?te? µ???? t
  ?a??ß?????? ??µß???
• ?? ?d??t??? ??e?d? k µ?????eta? se n µ???
  (??µß???)
• ???e ??µß?? ?p????fe? ??a µ???? t?? ?p???af?? µe
  t? ??e?d? p?? d?a??te?
• ?ta? µa?e?t??? t1 µ???, ? ??f?a?? ?p???af? ??e?
  ?????????e?

13
???t??a ?p??????

• ?p?f??? ?a??ß????? ?a? ?d??te??? ??µß??
• S????? st?d?a
• ?a?a???????s? ??µß??
• ?p?fas? ??a t? ?p????? t???
• ??aµ???asµ?? t?? ap?fas?? a?t??
• ?p?peda f?µ??
• CONFIDANT
• ???e ??µß?? pa?a??????e? t?? ?a?? s?µpe??f??? t??
  ?e?t????
• St???e? µ???µata ALARM st??? ?e?t???? t??.
• ?? ß?e?e? ?a??ß????? ??µß??, staµat?e? ? p?????s?
  pa??t?? p??? a?t??
• ?? ?at????????e ?d??a ? µeta???se epa?e?t?sseta?
  st? d??t??
• CORE
• ?? ??µß?? a?ta???ss??? pa?at???se?? ?p??????
• ?µfas? st??? ?d??te?e?? ??µß???

14
S?????

• ?? p??t?se?? ??a t?? asf??e?a sta a?t?f?? d??t?a
  p??pe? ?a ?????ta? µe ß?s? t?? e??? pa?aµ?t????
• ????? epe?e??ast??? ?s??? ?a? a?t???µ?a ??µß??
• ?s??p? ???s?µ?p???s? d??t?a??? p????
• ?d??t???t?ta ??s??
• ???a??? st?? t?p?????a
• ?µp?st?s???