??????????t?ta ?a? ???e??as?a

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??????????t?ta ?a? ???e??as?a

• ??s?f ?. ??d?????d????
• sandro _at_ noc.uoi.gr
• ???t?? ??a?e???s?? ???t??? ?a?ep?st?µ???
  ??a??????

2
???????s?

• ??????????t?ta
• ???e??as?a
• ?pe????/???d????
• ?sf??e?a
• S?µpe??sµata

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?????????? s??des?

• ?as??? ?a?a?t???st???
• a) ?d???e?pt? p??sßas? st? d??t??
• ß) ?????? ???µ?? µet?d?s?? ded?µ????
• ?) ???sßas? se d?ad?ast???? ?p??es?e? p???s???
  pe??e??µ???? (f???, e????a ?a? ded?µ??a)

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???p?? e?????????? d?as??des??

• ???sßas? xDSL
• ????t? t??ef???a t??t?? ?e????
• ???sßas? WI-FI
• ???a µ?sa µet?d?s??
• ????f?????
• ?pt???? ??e?
• ?a??d?a??? s??d?se??

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???s? e?????????? s??d?se??

• ?p????????a
• t??ef???a, e?????d??s?e??, d?µ?s?e?s? ?????? st?
  d?ad??t??, ?st?????a, a?ta??a?? ded?µ????
• G??s? ?a? e??as?a
• e??µ???s?, t??e?pa?de?s?, d?ad??t?a???
  ß?ß??????e?, e??????? µ??se?a, t??e??as?a
• ???p???t?s? ?a??µe????? a?a????
• t??e?at????, p??sßas? se d?µ?s???? ?a? ?d??t?????
  ???a??sµ???, ??e?t?????? eµp???? ?a? a?????
• ???a????a
• µ??s???, ta???e?, pa????d?a

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???e??as?a

• ? epa??e?µat??? apas????s? e?t?? ep??e???se?? µe
  ???s? t?? d??at?t?t?? p?? pa???e? ? t??eµat???.
  (?e???? ?paµp????t?)
• ???eµat??? ?? s????? t?? te?????? µe??d?? ?a?
  t?? ?p??es??? p?? s??d?????? t?? d??at?t?te? t??
  p????f?????? ?a? t?? t??ep????????a??? d??t???.
  (?e???? ?paµp????t?)
• ???f? e??as?a? ?at? t?? ?p??a ???eta? ???s?
  ?p?????st?? ?a? ????? µ?s?? t??ep????????a? µe
  s??p? ?a a????e? ? ded?µ??? ?e???af??? ??s?
  e??as?a?.

??s?f ??d?????d???? ??????????t?ta ?a?
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????? ?a???? ???a?e??

• PC/Notebook
• PDA
• Fax
• Phone
• Cellphone

• Dialup
• DSL
• Wi-Fi
• Bluetooth
• GSM/UMTS
• VSAT (Satellite)

• ????a
• ???t?a ???e??as?a?
• Internet Cafés
• ?e??d??e?a
• ?a?? ?d??

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?a ?p?? ?a? ta ?at?

• G?a t? ?e??ß?????
• ????te?? µ????s?
• ????te?? ????s?
• ?e??µ??? f???? sta µ?sa µa????? µetaf????
• ????te?? ?ata????s? e????e?a?

• G?a t?? ???a??µe??
• ????te?e? µeta????se??
• ??e??e?? ??????
• ?????? µe t?? ???????e?a
• ????te?a ???da
• ????te?e? a?a??a?e? ?de?e?
• ????µ??? p??s?p??? asf??e?a
• ?p??e?a epaf?? µe s??ad??f???
• ??st?? t??ep????????a??? e??p??sµ??
• ???ep????????a?? ??st?

• G?a t?? ????d?t?
• S????e?a e??as???
• ?a?s? a???p?????
• ????te?e? a?a??a?e? ?de?e?
• ??e????a
• ?e??µ??e? apa?t?se?? se ????
• ????te?e? ??se?? st??µe?s??
• ?????? µete??at?stas?
• se ????? ??????
• ??s????e? st? d?a?e???s?
• ?p??e?a ?µes?? e??????
• T?µata asf??e?a?
• ??ata?a?? ???? e??as?a?
• ?p??e?a epaf?? µe t?? pe??t?

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H d??aµ? t?? ???e??as?a?

• ?.?.?
• ???e??as?a t??????st?? 3 ?µ??e?/µ??a (IDC 2005)
• 8.9 e?at?µµ???a ?t?µa (2005)
• 10 e?at?µµ???a (p??ß?e?? 2008)
• 25 e? a?t?? e??????ta? ap???e?st??? ap? t?
  sp?t?
• ????p?
• ???e??as?a t??????st?? 1 ?µ??a/µ??a (Gartner
  2007)
• - 25 million (p??ß?e?? 2011)

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?as???? a??s???e?
??s?f ??d?????d???? ??????????t?ta ?a?
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???d???? / ?pe????

• ?pe???? st? eµp?ste?t???t?ta/a?e?a??t?ta/d?a?es?µ?
  t?ta
• ?st???a ?????? ? ????s? ???p???t?s?? (DoS)
• ?p????p? ? t??p?p???s? st???e???
• F?s??? ???p?
• Computers / Laptops / PDAs / Cellphones
• CDs / DVDs
• USB flash drives
• ???te????? s?????? d?s???
• ?a??a?????s? (se d?µ?s???? ??????)
• ??? ?a? ???p? ?a??ß???? ????sµ???
• ? e??te???? a???es? (outsourcing) t?? s??t???s??

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?? µp??e? ???p?? ?a p?e? st?aß?

• ? ???p? e??? f???t?? ?p?????st? (????? 2006) p??
  pe??e??e p??s?p??? ded?µ??a 26.5 ??at?µµ?????
  ßete????? t?? aµe???a????? St?at??, ap? t? 1975
• ?p??????? p??e t?? f???t? ?p?????st? st? sp?t?,
  ????? ?at?????? e???s??d?t?s? ?a? ????? ta
  apa?a?t?ta µ?t?a p??stas?a?
• ? a?s??d??? p?e???
• ?at? p?sa p??a??t?ta ?? ??st?? de ????????? ?a?
  de ?a as???????? µe ta pe??e??µe?a t?? ?p?????st?

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??pa?de?s?

• ???a??µe??? ??a a???? asf??e?a? ded?µ???? ?a?
  ß??t?ste? p?a?t????.
• ?? ?e???st?? e?a?s??t?? p????f????? ?a??? ?a?
  ?s?? µetaf????? t?t??e? p????f???e? e?t?? t??
  eta??e?a?/???a??sµ?? ?a p??pe? ?a ?ata???s???
  p????? t?? a??a ?a? t?? e?a?s??s?a t?? ded?µ????
  a?t??.
• S??e??? e?pa?de?s? ?a? ?e?t?????a s?st?µat??
  d?a?e???s?? asf??e?a? p????f????? (ISMS) ?p?? t?
  ISO 270012005.
• ?p?st????? ap? ?µpe??? ?a? ?at?????a e?pa?de?µ???
  te????? p??s?p???.

??s?f ??d?????d???? ??????????t?ta ?a?
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????t????

• ?a???? eta?????? ?p?????st? st?? e??a??µe?? ??a
  t??e??as?a ? ???
• ??t?? p??sd????sµ?? t?? ????sµ???? t? ?p???
  ep?t??peta? ?a e??atasta?e? st?? ?p?????st?
  p???e?µ???? ?a e?asfa???eta? ? asfa??? ?e?t?????a
  ?a? ?a ap?f?e????? d???t???? ???d???? asf??e?a?
• ?? ???ste? ?at? p?sa p??a??t?ta ?a µetaf??t?s???
  ?a? e??atast?s??? efa?µ???? ?µes?? µ???µ?t?? (??)
  ?a? ?µ?t?µ?? ?p?????st?? (P2P)
• ?a?eµp?d?s? µe ???a??asµ??? e????st?? d??at?t?t??
• ?e???d???? ??e????
• ???sµ?? s???e???µ???? µ??? ap?de?t?? efa?µ????

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???t?ste? ??a?t????

• ????t???? ?a? d?ad??as?e? .
• ???s??? st??? f???t??? ?p?????st??.
• ?p?t??p? t?? µetaf??t?s?? ?a? t?? ap?st????
  ded?µ???? µ?s? email.
• ?deat? ?d??t??? d??t?a.
• ?at?tµ?s? ded?µ????
• ?f?s??µ???? e??p??et?t?? µe pe?????sµ??? p??sßas?
• ?a??d??? d??at?t?ta p??sßas??, ?µes? ??s? ?ta?
  ?????????eta? ? e??as?a
• ?p?µ?????s? ded?µ???? µet? t? p??a? t?? e??st?te
  e??as?a?
• ??e???p???s? ?ata??af??

??s?f ??d?????d???? ??????????t?ta ?a?
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????a??? ?p?????st??

• S?????? e??a? ????te?? p??state?µ???? ap? a?t???
  st? ??afe??.
• ? e???d?t?? ??e? ????te?? ??e???.
• ?? ????sµ??? µp??e? ?a µ?? e??a? ????
  pa?aµet??p???µ??? ? ?a ??e? p??e? ?a e??a?
  ep??a???.
• ???sßas? st?? ?p?????st? ?a? ap? ???a µ??? t??
  ???????e?a?. (?a pa?d?? e??a? ???p?a!)
• ?????s? µe ???? ap? ?????? ?p?????st?? st?
  ????a?? d??t??.
• ???a?? ???s? a?asfa???? as??µat?? WiFi.

??s?f ??d?????d???? ??????????t?ta ?a?
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?sf??e?a ?p?????st??

• ???s? af?s??µ???? ?p?????st?? ??a t?? e??as?a.
• ?s???? s????µat???.
• ???s? ????sµ???? (s?st? e??atest?µ????!)
• Firewalls
• Anti-virus
• Anti-adware / anti-spyware software
• ???pt???af?a?
• ?p??a???p???s? ?e?t???????? ?a? ????sµ????.
  (Updates)
• ??e???p???s? a?t?µat?? ep??a???p???s?? ? ???s?
  a?t?µat?? s?st?µ?t??.
• ? d?aµ???asµ?? a??e??? ?a p??pe? ?a eµp?d?s?e?
  ?ste ?a µ?? ?p???e? ?µes? p??sßas? ap? t???
  ?p????p??? ?p?????st?? p?? e?de??µ???? ß??s???ta?
  st? d??t?? t?? t??e??a??µe???.

??s?f ??d?????d???? ??????????t?ta ?a?
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?p????????a

• ?? µetad?se?? ?a p??pe? ?a e??a?
  ???pt???af?µ??e?.
• ???t?st? ??s? ? ???s? ?deat?? ?d??t???? d??t???
  (Virtual Private Networks-VPNs) ta ?p??a
  ???pt???af??? ta ded?µ??a t?? ???st?
  d?µ???????ta? µ?a s??a??a µ?sa st? e???te??
  d??t?? t?? pa?????
• IPSec VPN
• SSL VPN
• ???s? Windows Remote Desktop, Citrix ? ?????
  efa?µ????
• ?s???? p?st?p???s? µe s??d?asµ?
• S????µat????
• ???p??? ???ta?
• One time password
• RADIUS
• ?p?d?µ? d?µ?s??? ??e?d??? (PKI)

??s?f ??d?????d???? ??????????t?ta ?a?
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?s??µat?? ???d????

• ?a as??µata d??t?a ???????µ??? t??? ???d????? t??
  pa?ad?s?a??? e?s??µat?? d??t??? ?a? ep?p????
  e??a? e????ta se ??e? ape????.
• ?a ?ad????µata ta??de???? e?e??e?a ????? ?a
  µp????? e????a ?a pe?????s????
• ? e?sß???a? µp??e? ?a ?p?????e? ded?µ??a ?????
  ?a? ?a p??s??se? t? ???? µa?
• ?e ?ate????t???? ?e?a?e? ?a? ?at?????? e??p??sµ?
  e??a? d??at? ? ?p????p? ap? µe???e? ap?st?se??.
• ?p???se?? ????s?? e??p???t?s?? µe pa?eµß????.
• ?ata??af? t?? ????se?? t?? ???st?. (p.?. ????t?)
• ???s? p?ast??-pe??at???? sta?µ?? ß?s??.
• ????sµata ???p?? ???? t?? µ????? µe??????.

??s?f ??d?????d???? ??????????t?ta ?a?
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?sf??e?a ?s??µat??

• ??e???p???s? ???pt????f?s?? (WPA2)
• ???a?? p??sd????st???? service set identifier
  (SSID) ?a? s????µat????
• ?pe?e???p???s? as??µat?? d?a?e???s??
• ?p??a???p???s? ?d???? ?a? ????sµ???? s?s?e???
  (firmware)
• ??p???t?s? st? ???t?? t?? sp?t???, ??? ???t? se
  pa?????a
• ???s? asfa??? p??t??????? (POP3s, SMTPs, HTTPs
  Webmail)

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S?µpe??sµata

• ? e?????????t?ta e??a? ap?t??esµa t?? s????t?s??
  t?? d?ad??t?a??? te???????a? ?a? t?? s????????
  ep????????a??? a?a???? ?a? ?p?? ??a de?????? ?a
  µa? e??p??ete? ??a p???? ?????a.
• ? t??e??as?a e??a? µ?a ap? t?? efa?µ???? p?? ??
  e?????????? s??d?se?? pa?????? µe p???ap?? ?f???
  t?s? ??a t??? e??a??µe????, t??? e???d?te? a???
  ?a? t? pe??ß?????.
• ? p??sßas? se efa?µ???? t??e??as?a? ????? ta
  ?at?????a µ?sa e?asf???s?? t?? a?e?a??t?ta?,
  eµp?ste?t???t?ta? ?a? d?a?es?µ?t?ta? t??
  p????f????? µ????e? µe ??s??? ?????ta µe 5
  sfa??e?.
• ?p???e? p?????a ap? te????? µ?sa ?a? ?at?????e?
  µe??d??? p?? µp????? ?a e???????? ??a t??
  asf??e?a t?? ded?µ???? sta s?st?µata t??e??as?a?.
• ? s??d?asµ?? t??? µe s???e???µ??e? ?a?
  efa?µ???µe?e? p???t???? asf??e?a? p??state?e?
  epa???? ta s?st?µata t??e??as?a? ?ste te???? ?a
  µp????? ?a a?tape??????? st? s??????? apa?t?t???
  e??as?a?? pe??ß?????.

??s?f ??d?????d???? ??????????t?ta ?a?
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???a??st? ??a t?? p??s??? sa?

• ??s?f ?. ??d?????d????
• sandro _at_ noc.uoi.gr
• ???t?? ??a?e???s?? ???t???
• ?a?ep?st?µ??? ??a??????