Studiekompasset.dkKlasse: STX 3.g · Fag: SRP, Matematik A, Samfundsfag A
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Table(of(Contents(
Abstract(.......................................................................................................................................(1!
Indledning(..................................................................................................................................(3!
Hvordan(fungerer(den(elektroniske(overvågning(........................................................(4!
Overvågningssamfundet(................................................................................................................(4!
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Hvordan(undgår(man(overvågning(....................................................................................(9!
RSA(.........................................................................................................................................................(9!
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PGP(......................................................................................................................................................(17!
Sikkerheden(af(RSA(........................................................................................................................(18!
Hvad(er(konsekvenserne(af(øget(overvågning(............................................................(19!
Perspektivering(.....................................................................................................................(22!
Konklusion(..............................................................................................................................(23!
Bibliografi(...............................................................................................................................(25!
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6.,,2-%6(1%.-!,)0!$%-(-0)->!
!
c!
V)*E.*!)*!0)1!3%<1%<1!(1!$(3)!)1!*)4(1%.-)41!.3)*:4%69!&Y!,(-!6(-!6.*14O<<)!
6.,,2-%6(1%.-)-!,)44),!:*2<)*-)9!.<!0)*E.*!)*!0)1!E),1)!'*%-5%'!&.,!D)40<((*0!
.'&1%44)*!*)4(1%.-)41!.3)*:4%6g!
!
F>(G,-&/0#',-/(#",$:-0.(H(E,$(1.&-("7$,(3*-0+5,%()#$(&/(.#$/-7++,(%,(.#33*'0.&/0",(
',/"7$.4(%,$(#;1/2$4('2$(3,'',1.,$(&'",'%,$(I'/,$',/(/0-(#$+&'01,$0'+4(
.#33*'0.&/0#'(,--,$(0')#$3&/0#'116+'0'+B((
D.0&O1-%-<)-!(E!UUU!)*!0)-!,)&1!&6X241)!0)4!(E!-)11)19!#.*>!!
#.*!)*!)-!0)4!(E!0)1!&Y6(401)!C0(*6!/):C!0)*!(-3)-0)*!&%<!(E!0)1!&(,,)!.EE)-14%<)!
%-1)*-)1>!?.*&6)44)-!)*!(1!%!0(*6!/):!)*!0)1! %66)!,24%<1!(1!&Z<)!)44)*!4( <*)!0(1(>!
Q*2<)*-)!(E!V(*6!/):!:)&1Y*!(E!&,Y!-)13O*6!&Y3)4!&.,!&1.*)!&.,!E.*!)6&),')4!
?*))-)19!"LF!.<!#.*!0*)3)1!(E!%-0%3%0)*!.<k)44)*!.*<( - %&(1%.-)*>!!
!
D(-!6(-!62-!6.,,)!%-0!'Y!#.*!,)0!)-!&')5%)4!&.E1/(*)9!0)*!<Z*!)-&!:)4%<<)-$)0!
(-.-@,!(Money, 2014)!.<!&Y4)0)&!E.*$%-0*)&!.3)*3Y<-%-<)-!1.1(41>!!
FY!&(,,)!,Y0)!&.,!UUU!:4)3!#.*!.'*)11)1!,)0!<.0)!%-1)-1%.-)*>!V)1!:4)3!
.'*)11)1!(E!C2&!-(3(4!*)&)(*5$!4(:.*(1.*@C!%!L__L9!&.,!)-!,Y0)!(1!6.,,2-%6)*)!
(-.-@,1!,)-!%!0)!&)-)&1)!"_!Y*!)*!0)--)!(-.-@,%1)1!:4)3)1!,%&:*2<1!1%4!&(4<!(E!
&1.EE)*9!24.34%<1!'.*-.<*(E%!.<!20:20!(E!4)X),.*0)*)>!!
A!)-!2-0)*&Z<)4&)!(E!b(*)1$!T/)-!E(-01!$(-!20!(E!(1!0)1!,)&1!)E1)*&'2*<1)!%-0$.40!
'Y!-)13O*6)1!#.*!3(*!:Z*-)'.*-.9!.<!0)*-O&1!&.*1)!,(*6)0)*>!(Wikipedia,
Wikipedia)!
!
8)1!20!E*(!?.25(241&!1).*%!.,!'(-.'1%&,)!)*!0)1!2.3)*3Y<)0)!-)13O*6!)1!)6&),')4!
'Y!')&1)->!!
FY!&(,,)!,Y0)!)*!#.*!)1!(-(*6%!$3.*!%-<)-!,(<1!6(-!*)<%&1*)*)9!.3)*3Y<)!)44)*!
6.-1*.44)*)!0)-!0%&1*%:21%.-!(E!%-E.*,(1%.-)*!0)*!E%-0)*!&1)0>!!
?.25(241!E.*64(*)*!$3.*0(-!')&1)-!&6(4!,.0&3(*)&!(E!.*0)-9!.<!(1!0)-!$(*!C<%3)1!
(-4)0-%-<!1%4!-.<4)!0%&5%'4%-O*)!&6),()*C (Foucault, 1975)!
!
P!
Q(<!3)0!3.*)&!:)$.3!E.*!(1!.3)*3Y<)!.<!6.-1*.44)*)9!4%<<)*!E*@<1)-!E.*!2.*0)-9!
1)**.*%&,)9!&,%11)!(E!&@<0.,,)!.<!E.*:*@0)4&)*-)>!!
!
Hvordan(undgår(man(overvågning(
!
RSA(
!
H8=!)*!)-!,)<)1!'.'24O*!(4<.*%1,)!0)*!:*2<)&!(E!5.,'21)*)!1%4!(1!)-6*@'1)*)!.<!
0)6*@'1)*)!:)&6)0)*9!&Y0(-!&Y!)1!2Z-&6)1!1*)0X)'(*1%!%66)!6(-!&)!0),>!V)1!0)*!
6)-0)1)<-)*!H8=!)*!)1!0)1!)*!)1!C'2:4%5I6)@!&@&1),C!$3%46)1!3%4!&%<)!(1!0)*!)*!)-!
.EE)-14%<!.<!)-!$),,)4%<!6*@'1.-Z<4)>!=44)!6(-!3O*)!%!:)&%00)4&)!(E!0)-!.EE)-14%<)!
-Z<4)9!.<!0)*,)0!3%0)!$3.*0(-!,(-!6*@'1)*)*!)-!:)&6)09!,)-!0)6*@'1)*%-<&-Z<4)-!
$.40)&!$),,)4%<>!=4<.*%1,)-!)*!&6(:1!&Y4)0)&!(1!,(-!%66)!6(-!E%-0)!0)-!$),,)4%<)!
-Z<4)!20!E*(!0)-!.EE)-14%<)>!!
!
V)11)!&6@40)&!(1!,(-!&6(:)*!0)6*@'1)*%-<&!-Z<4)-!3)0!(1!<(-<)!1.!&1.*)!'*%,1(4!
&(,,)-!'Y!.,6*%-<!"__!5%E*)>!D(-!6(-!:4.1!E%-0)!0)-!$),,)4%<)!-Z<4)!0!$3%&!,(-!
6(-!:)*)<-)!'$%!(E!-!.<!$3%&!-!)*!)1!&1.*1!-.6!1(4!3%4!0)1!1(<)!E4)*)!Y*!E.*!&)43!)-!&2')*!
5.,'21)*>!
V)1!)*!4)1!-.6!(1!<(-<)!1.!&1.*)!'*%,1(4!&(,,)-9!,)-!0)1!)*!4(-<1!&3O*)*)!(1!
*)3)*&)*)!$(-04%-<)-!.<!E%-0)!0)!1.!'*%,1(4>!V)11)!&6@40)&!(1!0)*!)-0-2!%66)!
)6&%&1)*)*!)-!$2*1%<1!.<!)EE)61%3!,Y0)!(1!E(61.*%&)*)!&1.*)!&(,,)-&(11)!1(4>!(Nissen,
1997)!
Eulers(funktion(
(
?.*!)1!$)41!1(4!-!0)E%-)*)&!K24)*&!E2-61%.-!&.,!(-1(44)1!(E!$)4)!1(4!:4(-01!1(44)-)!
"9L9Rl-9!&.,!$(*!"!&.,!&1Z*&1)!EO44)&!0%3%&.*!,)0!-9!(41&Y!)*!'*%,%&6)!,)0!->!!
?.*!)6&),')4!$3%&!𝑛 = 10!!&Y!)*!"9!R9!N9!P!'*%,%&6)!,)0!"_9!,)-&!L9W9M9f9c9"_!%66)!)*>!
V)*E.*!)*!𝜑 10 = 4!
?.*!)1!'*%,1(4!'!)*!(44)!1(4!"9Ll9!'!I!"!'*%,%&6)!,)0!'9!0)*E.*!)*!𝜑 𝑝 = 𝑝 − 1>!!
!
"_!
!
?.*!)1!'*%,1(4!'!<O40)*9!(1!
𝜑 𝑝 = 𝑝 − 1!
!
"#$!%#!&#$'()**+,)!-$+.%/*!-0!1!,2*3)$0!/%!
!
𝜑 𝑝𝑞 = 𝑝 − 1 · (𝑞 − 1)!
!
4$#35(%)%!/&!-$+.%/**)6)!𝜑 𝑝𝑞 !(/*3)$!7+!𝜑 𝑛 8!9%!:)'%)..)!𝜑 𝑛 0!/*%';!/%!&/(%#$+')$)!
-$#35(%)%0!)$!)('%$).%!%+3'($27)63)!<7+'!./6!+(()!()63)$!-$+.&/(%#$#-*='6+6,)6!
𝑚 = 𝑝𝑞!
"#$!/%!:)'%)..)!𝜑 𝑚 !'(/*!./6!:)'%)..)!/**)!<)*)!%/*!.+63$)!)63!.0!3)$!)$!+63:>$3)'!
-$+.+'(!.)3!.8!!
?/!3)$!&+63)'!5)63)*+,)!./6,)!-$+.%/*!7+!(/6!,/6,)!'/..)6@A!(/6!-$#35(%)%!:*+7)!
5<>$)!'%#$%8!B7+'!7+!&#$)'%+**)$!#'!/%!𝑚 = 10
!""
!#,!/%!3)%!%/,)$!#'!C!.+**+#6D%)!3)*!/&!)%!
')(563!@10
!!
!')(A!/%!/&,=$)!#.!)%!<)*%!%/*!)$!-$+.+'(!.)3!.!7+**)!3)%!+!/*%!%/,)E!
!
10
!""
· 10
!!
𝑠𝑒𝑘 = 10
!"
·
1
60 · 60 · 24 · 365
å𝑟~3,2 · 10
!"
å𝑟 !
!
?)%%)!/6%/*!;$!)$!&*)$)!,/6,)!56+7)$')%'!/*3)$0!#,!3)$&#$!)$!.)%#3)6!+(()!'2$*+,!)&&)(%+78!
B7+'!6#,)6!&/63%!)6!.)%#3)!<7#$!./6!(566)!53*)3)!%/**)6)!3+$)(%)!53)6!/%!()63)!
-$+.&/(%#$)6)!+!60!7+**)!7)3(#..)63)!:*+7)!F53=3)*+,,G#$%!+!./%)./%+()$($)3')F!
(Nissen, 1997)!
?)%!7+**)!#,';!=3)*2,,)!'+(()$<)3)6!&#$!HI9!&5*3'%263+,0!.)6!3)%!(#..)$!7+!.)$)!+63!
-;!+!3+'(5''+#6)68!!
J/3!𝑚 = 𝑝 · 𝑞!<7#$!-!#,!1!)$!%#!&#$'()**+,)!-$+.%/*8!K/**)6)!.+63$)!)63!.0!3)$!+(()!)$!
-$+.+'()!.)3!.0!)$!3)!%/*0!3)$!</$!-!)**)$!1!'#.!-$+.&/(%#$)$0!/*%';!3)!1!L!C!%/*!
!
𝑝 · 1, 𝑝 · 2, … , 𝑝 · 𝑞 − 1 !
!
""!
#,!3)!-!L!C!%/*!
!
𝑞 · 1, 𝑞 · 2, … , 𝑞 − 1 · 𝑞!
96%/**)%!/&!%/*!:*/63%!C0M0N0-1LC0!3)$!)$!-$+.+'()!.)3!.!O!-1!)$!3)$&#$!
𝑝 · 𝑞 − 1 − 𝑞 − 1 − 𝑝 − 1) = (𝑝 − 1)(𝑞 − 1)!
I2%6+6,)6!)$!65!:)7+'%8!(Spalk, 2002, s. 42)!
!
Eulers(sætning(
!
K24)*&!&O1-%-<!)*!)-!<)-)*(4%&)*%-<!(E!?)*,(1&!4%44)!&O1-%-<!
!
`3%&! 𝑎, 𝑛 = 𝑔æ𝑙𝑑𝑒𝑟, 𝑎𝑡!𝑎
!(!)
≡ 1(𝑚𝑜𝑑!𝑛)!
!
B7+'!/!)$!+63:>$3)'!-$+.+'(!.)3!6!,2*3)$!/%!
!
J(0!
𝑟
!
, … , 𝑟
!(!)
!
!
72$)!)%!$)35P)$)%!'2%!/&!$)'%)$8!Q/6,)$!7+!3+'')!)*).)6%)$!.)3!/!&;$!7+!)%!/63)%!
$)35P)$)%!'2%!/&!$)'%)$!@*)../!RCA!
𝑎𝑟
!
, … , 𝑎𝑟
!(!)
!
?+'')!%#!-$#35(%)$!/&!)*).)6%)$!)$!3)!'/..)!+!.#35*#!6!
𝑟
!
· 𝑟
!
… , 𝑟
! !
≡ 𝑎 · 𝑟
!
· 𝑎 · 𝑟
!
… 𝑎 · 𝑟
! !
!𝑚𝑜𝑑!𝑛 →!
𝑟
!
· 𝑟
!
… , 𝑟
! !
≡ 𝑎
! !
· 𝑟
!
· 𝑟
!
… , 𝑟
! !
!!𝑚𝑜𝑑!𝑛!
V(!(44)!*
%
!)*!%-0:@*0)&!'*%,%&6)!,)0!-9!6(-!0)!E.*6.*1)&!%EZ4<)!6.*.44(*!LN!(Spalk,
2002, s. 33)!
!
𝑎
! !
≡ 1 𝑚𝑜𝑑!𝑛 !
!
!
"L!
I2%6+6,)6!)$!65!:)7+'%8!(Spalk, 2002, s. 45)!
(
Euklids(algoritme(
!
!
K264%0&!(4<.*%1,)!)*!)-!'*.5)&&!0)*!:)*)<-)*!0)-!&1Z*&1)!EO44)&!0%3%&.*!(E!1.!
&(,,)-&(11)!1(4>!
!
𝑎, 𝑏 = 𝑎, 𝑟 !$3.*!*!)*!*)&1)-!(E!:!3)0!0%3%&%.-!,)0!(!
!
!
𝑎 = 𝑞
!
· 𝑏 + 𝑟
!
!!!!!!!!!!!!!0 ≤ 𝑟
!
< 𝑏!!!!!!
!!!!!!!!!!
𝑏 = 𝑞
!
· 𝑟
!
+ 𝑟
!
!!!!!!!!!!!!0 ≤ 𝑟
!
< 𝑟
!
!!!!!!!!
!!!!!!!!!!!!
𝑟
!
= 𝑞
!
· 𝑟
!
+ 𝑟
!
!!!!!!!!!!!0 ≤ 𝑟
!
< 𝑟
!
!!!!!!!!
!
>>>!
!
𝑟
!!!
= 𝑞
!
· 𝑟
!!!
+ 𝑟
!
!!!!!0 ≤ 𝑟
!
< 𝑟
!!!
!
!
𝑟
!!!
= 𝑞
!!!
· 𝑟
!
!
!
F*.5)&&)-!)*!EO*0%<!-Y*!*)&1)-!)*!4%<!,)0!_9!(41&Y!0%3%&%.-)-!)*!<Y)1!.'>!K1!)6&),')4!
'Y!0)--)!(4<.*%1,)!%!(-3)-0)4&)!6(-!&)&!%!8STUVKS!)6&),'4)1!&)-)*)>!
F*.5)&&)-!&1(-0&)*!E.*0%!0)-!*)&1!3%!EY*!(41%0!)*!,%-0*)!)-0!0)-!*)&1!3%!E%6!%-0)->!K1!
(E1(<)-0)!EZ4<)!(E!'.&%1%3)!$)4)!1(4!3%4!EZ*!)44)*!&%0)-!&1(-0&)!
a%!6(-!-2!6.-6420)*)!(1!
!
!
"R!
𝑎, 𝑏 = 𝑟
!
, 𝑏 = 𝑟
!
, 𝑟
!
= 𝑟
!
, 𝑟
!
= ⋯ = 𝑟
!
, 𝑟
!!!
= 𝑟
!
, 0 = 𝑟
!
!
!
8Y!3)0!3%!(1!0)-!&1Z*&1)!EO44)&!0%3%&.*!%!(9:!)*!𝑟
!
!(Spalk, 2002, s. 12)!
!
!
!
!
Bevis(for(RSA(
!
a%!:)3%&)*!(1!H8=I6*@'1.&@&1),)1!E2-<)*)*>!!
!
𝑚 → 𝑚
!
𝑚𝑜𝑑!𝑛 → 𝑚
!
𝑚𝑜𝑑!𝑛
!
𝑚𝑜𝑑!𝑛 = 𝑚
!"
𝑚𝑜𝑑!𝑛 = 𝑚!
!
V)--)!4%<-%-<!:)1@0)*!:4.1!(1!3%!6(-!EY!0)-!&(,,)!6.0)!,!E.*!64(*1)6&1)-!20!&.,!3%!
*)<-)*!%-0>!=41&Y!(1g!
!
𝑚
!"
𝑚𝑜𝑑!𝑛 = 𝑚!
!
Q)3%&)1!6(-!20EZ*)&!'Y!1.!,Y0)*!(E$O-<%<1!(E!.,! 𝑚, 𝑛 = 1!)44)*!(𝑚, 𝑛) ≠ 1!
!
d)<!3%4!62-!:)3%&)!1%4EO40)1! 𝑚, 𝑛 = 1!0(!0)1!-O&1)!)*!,)<)1!2&(-0&@-4%<1!.<!)*!)X!
$)44)*)!1%4EO40)!%!3.*)&!6*@'1)*%-<&>!b*2-0)-!1%4!(1!(𝑚, 𝑛) ≠ 1!)*!2&(-0&@-4%<1!)*!
E.*0%!(1!0(!𝑛 = 𝑝 · 𝑞!3%4!)-!EO44)&!0%3%&.*!%!,!.<!-!)-1)-!3O*)!4%<!,)0!'!)44)*!4%<!,)0!
m9!0(!0)!:)<<)!)*!'*%,1(4>!J(0!.&!1O44)!$3.*!,(-<)!1(4!,)44),!"!.<!'m!0)*!6(-!
0%3%0)*)&!,)0!'!)44)*!mg!
!
'!<Y*!.'!%!1(44)-)g!!𝑝, 2 · 𝑝, 3 · 𝑝, … , 𝑞 − 1 · 𝑝!,)44),!"!.<!'m!
m!<Y*!.'!%!1(44)-)g!!𝑞, 2 · 𝑞, 3 · 𝑞, … , 𝑝 − 1 · 𝑞!,)44),!"!.<!'m!
V)1!3%4!&%<)!(1!0)*!)*! 𝑞 − 1 + 𝑝 − 1 + 1 = 𝑝 + 𝑞 − 1!1(4!,)44),!"!.<!'m!$3.*!
𝑚, 𝑛 ≠ 1!
!
"W!
`3%&!:)<<)!'!.<!m!$(*!"__!5%E*)9!&.,!%!)1!*)(4%&1%&6!0(1(&O1!\^9!6(-!&(-0&@-4%<$)0)-!
E.*!1(4!,)44),!'m!$3.*! 𝑚, 𝑛 ≠ 1!%!E.*$.40!1%4!$3.*!,(-<)!1(4!0)*!)*!,)44),!"!.<!'m!
.'&1%44)&!&Y4)0)&g!
𝑝 + 𝑞 − 1
𝑝 · 𝑞
≈
10
!""
10
!""
= 10
!!""
!
!
!
#%4EO40)!"!
J(0!.&!(-1(<)!(1!,!.<!-;&!&1Z*&1)!EO44)&!0%3%&.*!)*!">!AEZ4<)!K24)*;&!&O1-%-<!<O40)*g!!
!
𝑚
!"
(𝑚𝑜𝑑!𝑛) ≡ 𝑚
!" !"#!! !
(𝑚𝑜𝑑!𝑛)!
!
V(!𝑒 · 𝑑 ≡ 1(𝑚𝑜𝑑!𝜑 𝑛 )!EY*!3%9!(1!&O1-%-<)-!)*!:)3%&19!$3%&! 𝑚, 𝑛 = 1!
!
Enkryptering(og(dekryptering(af(SNOWDEN(
(
(^ aO4<!'*%,1(44)-)!'!n!"N!9!m!n!LR!.<!𝑛 = 17 · 23 = 391!
!
!
:^ Q)*)<-!𝜑 𝑛 = 𝑝 − 1 · 𝑞 − 1 = 17 − 1 · 23 − 1 = 352!
!
!
5^ aO4<!)!&Y4)0)&!(1!0 < 𝑒 < 𝜑 𝑛 !.<!\)9!𝜑 𝑛 ) = 1!
=41&Y!3O4<!)!1%4!(1!3O*)!)1!1(4!$3.*!0)-!&1Z*&1)!EO44)&!0%3%&.*!(E!RML!.<!)!)*!"!
d)<!$(*!3(4<1!)!n!LN!
0 < 27 < 352!𝑜𝑔! 27,352 = 1!!
!
!
0^ Q)*)<-!09!&Y4)0)&!(1!𝑒𝑑 ≡ 1 𝑚𝑜𝑑!𝜑 𝑛 !
!
"M!
!
?.*!3%46Y*4%<)!$)4)!1(4!,!.<!-!,)0!𝑛 > 0!E%-0)&!)-1@0%<1!:)&1),1)!$)4)!1(4!m!.<!*9!
&Y4)0)&!(1!
𝑚 = 𝑞 · 𝑛 + 𝑟, 0 ≤ 𝑟 < 𝑛!
(!n!RML!!!9!!!!:!.<!)!n!LN!
!
8Y!:*2<)*!3%!&O1-%-<!W>R!0%3%&%.-!,)0!*)&1!.<!EY*!m!
352
27
= 13,03704 = 𝑞1!
352 − 13 · 27 = 1 = 𝑟1!
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!352 = 13 · 27 + 1!!,!!!!!𝑎 = 𝑞
!
· 𝑏 + 𝑟
!
!
!
𝑏 = 𝑞
!
· 𝑟
!
+ 𝑟
!
!
!
27 = 27 · 1 + 0!
!
!
!
V)11)!6(-!:)-@11)&!1%4!(1!&6*%3)!)-!4%-)O*!6.,:%-(1%.-!(E!\RML9LN^!
!
𝑎, 𝑏 = 𝑠 · 𝑎 + 𝑡 · 𝑏!
a)0!$XO4'!(E!.3)-&1Y)-0)!20*)<-%-<!6( -!3%!:)&1),,)!3.*)&!0!
𝑠
!
= 1!!!!!,!!!!𝑡
!
= −𝑞
!
= −13!
𝑠
!
= 1!
𝑠
!
= −𝑠
!
· 𝑞
!
= −1 · 27 = −27!
!
!
𝑡
!
= 1 − 𝑡
!
· 𝑞
!
= 1 − −13 · 27 = 352!
!
𝑡
!
= 𝑡
!
− 𝑡
!
· 𝑞
!
= −13 − 352 · −1 = 339!
!
"f!
!
! !
5^!Q)-@1!E2-61%.-)-!𝑚 → 𝑚
!
𝑚𝑜𝑑𝜑 𝑛 !
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