network and computer security, lecture 5 - mit … · 6.857 computer and network security lecture 5...
TRANSCRIPT
6857 Computer and Network Security Lecture 5
Admin Problem Set 1 due in Lecture 6 Problem Set 2 out Lecture 6 Next lecture by TA (secret sharing and bitcoin) Submit passwords (not real ones) for problem set 2
Project Ideas ldquoFormat-Transforming Encryptionrdquo Shrimpton 2014 Real-World Crypto talk Also see httpsfteproxyorg
Today Crypto hash functions applications and constructions Applications
o Signatures o Commitments o Merkle trees o Payword o Hash-cash
Construction o Merkle-Damgard o Sponge function
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MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
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8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
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8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
--
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If----t--+--+---t--+--+--t----1f--t-~ 1 +-Ishy
- ~~ jH ~
I I
+ c----c 1-- Lshy+
-I- -I- ~ ~ ~ -I- ~ -I-+ bull~ ~ t- -I- I--II---f-+-+-+--+- +--+--t---j-~ -I- - ~ -r- -+ + -
I
r--t---t--t- t---+--+---+--+--+- f- +-+--f--t +--+-+-+---+ -Ishy -I- I--t- --1--+-+ - - -----tt
II I r ~-
5
__
-
-----
I
)f
mdash-
p
-C-
I
C
lsquoCe m
S
_
-
lsquoC
amdash
irmdash
b-
I
C
bull
arsquo -a
-V
I
I a
a
Krsquo
IA
a-
It
I
rO jJlf
= a bullbull--
I -l
F
1mdash
irsquo
a mdash
bullamdashIncin
-hL
c
a r
-r-
r
Si
lsquo_tt
I lsquo 3
r-t q
3
-D
mdashn
Oslashrsquo-t-
-----e
LW
3
1
3
p
tsitL
Lp
-
_
ci
aE
I V
L
3
r r 1
a 1
-ft
t
-tbull
imdash
qj----
bull _
1a
a
mdashC
Sfbull
3--a it
-1
a
L a
S
ha
mdash mdash
4---
-
t
lsquo a
V 4
+
0
Irsquo mdash
Nt
r
c rmdash
p-
LS
=mdash
mdash
Imdash
2
)arsquo
deg--
a-
I
3
1rsquo
H a
cL
0
fl
-r
rsquo
1 bull
t
a
oil
sJ arsquo-
h1137
1 it
Iii
1
lsquoP
u--J
6
___mdashmdash
----
--
--
--
- --
- -
--
--
-
_
mdash mdash
mdash mdash
mdash mdash mdash mdash mdash
mdash mdash
mdash mdash mdash mdash mdash mdash
mdash mdash mdash mdash mdash mdash mdash
---mdash mdash
--
mdashj
mdash
mdash mdash mdash mdash mdash mdash nmdash-Imdash
I lsquo4
amdash
r
d P_li-Ill 3 111
plusmn )iJrfl EZZZZ_______
j-l--f shy
Amdash r I
mdash
Ii aLlTzT [W
amdash-a-Imdash - e mdashmdash -a aa
lsquo
- shy
l-
I shy
-
I 5amp Is
a a I
f 1
-e -lsquo --
utfl wz afl
J bl lsquo r
E uuml4
lsquo AUfl
mdash
1-1-- ---I- --l shy
i- -- - shy
- - -1 I
f- -- shy--I mdash--- - E - ~
il~ E ft~il r~ i 1= l-C l i~ -c~ II
Wrsquoe s ccedilwlsquoj W ~~~E (1C iJ ~h
t_~ ~ ~) Iwl~ 1bull
~ ~lt L
u3 lsquo4E
VI ct 1~~b f--~t 1 lN br
j 1_ -4-
-4
11
-i~ 11Ie _1-_=-fl---j-I- shy _ I shy - I +---1-+ +shy10
flfr4 bullbull - -= ~
(WIllA -1 1
~i -I---- I-----fshy~- ~ shy _
IImiddot-~ Ivf ~ - 1
mdashmdash
II-f-i- shy
arsquo ---
~~ ~)I-r- f=r-- f-1-1-+
- --+-+-I-f-of-- - Imiddotmiddot I
Ij---j--+-+--+ -+--+--+ - 1shy -1 bull -1- Ishy-- -+--l-I shy
-+-i~-+-i- I shy - 1shy i shy+
mdashmdashmdash--mdashmdash
I- o- -- shy- l shymdash Imdash--
mdash
mdashmdash
mdash d J t-t--t shy
I-shy_-t- -1-- 1I 1--r-
--t---I---4 -- 1-shy----+--+-+-IIt
c- i i
~ l shyr- I _ - -- middot- 1- -l--+-j f---I-i-shy-
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iI- I I--+---f-+- +-1-+ -L I- shyf--I--shy 1---shy mdashf-- shy
i shyI-- i-I
-+-t-~Lt- I--+--+shyl I _- I- ---
I
iIJ I l- Ishy- -
L-
7
___
E ~
l0shy
bullbullbullbullbull
tt tt Kcca ko)a)j -
-( +-+- )
~~ ~~
--I II II
+-+- r4 00~r4~Igt-~TCC ((iii~~ryenLI-~ II I 1 1-0lt1)-- -0 ltIt)
III ii it oo NN
NC
N p-a
I II IS IS Q) ~
lsquo9
~ ~~~ -------- f---- shy---------- f---- shy
S
( +-+- ))C -V
~~
bullbullbull
r
lsquolrsquo lv mdash
Sb Ri t lsquoIrsquo
) t
C bull
I
~
(
n -lsquo
o lot
-h
+-
~ ~ Ii-8
~-~7
0 00
Uu
i I
5 3 ji II tanmdashc lsquomdashlsquo
-C p-LI
p
mdashldquoa
r s lsquoamdash o
Ursquo (
I N I I
lsquo-lsquo mdash a71-
( -h
t +- )
L jlsquo-t LI
C mdash
5 1)--
tiJlsquoI A o zc 1 Q V -1 toslashU-deg rmdashRJ
~ )
8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
__
-
-----
I
)f
mdash-
p
-C-
I
C
lsquoCe m
S
_
-
lsquoC
amdash
irmdash
b-
I
C
bull
arsquo -a
-V
I
I a
a
Krsquo
IA
a-
It
I
rO jJlf
= a bullbull--
I -l
F
1mdash
irsquo
a mdash
bullamdashIncin
-hL
c
a r
-r-
r
Si
lsquo_tt
I lsquo 3
r-t q
3
-D
mdashn
Oslashrsquo-t-
-----e
LW
3
1
3
p
tsitL
Lp
-
_
ci
aE
I V
L
3
r r 1
a 1
-ft
t
-tbull
imdash
qj----
bull _
1a
a
mdashC
Sfbull
3--a it
-1
a
L a
S
ha
mdash mdash
4---
-
t
lsquo a
V 4
+
0
Irsquo mdash
Nt
r
c rmdash
p-
LS
=mdash
mdash
Imdash
2
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deg--
a-
I
3
1rsquo
H a
cL
0
fl
-r
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1 bull
t
a
oil
sJ arsquo-
h1137
1 it
Iii
1
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u--J
6
___mdashmdash
----
--
--
--
- --
- -
--
--
-
_
mdash mdash
mdash mdash
mdash mdash mdash mdash mdash
mdash mdash
mdash mdash mdash mdash mdash mdash
mdash mdash mdash mdash mdash mdash mdash
---mdash mdash
--
mdashj
mdash
mdash mdash mdash mdash mdash mdash nmdash-Imdash
I lsquo4
amdash
r
d P_li-Ill 3 111
plusmn )iJrfl EZZZZ_______
j-l--f shy
Amdash r I
mdash
Ii aLlTzT [W
amdash-a-Imdash - e mdashmdash -a aa
lsquo
- shy
l-
I shy
-
I 5amp Is
a a I
f 1
-e -lsquo --
utfl wz afl
J bl lsquo r
E uuml4
lsquo AUfl
mdash
1-1-- ---I- --l shy
i- -- - shy
- - -1 I
f- -- shy--I mdash--- - E - ~
il~ E ft~il r~ i 1= l-C l i~ -c~ II
Wrsquoe s ccedilwlsquoj W ~~~E (1C iJ ~h
t_~ ~ ~) Iwl~ 1bull
~ ~lt L
u3 lsquo4E
VI ct 1~~b f--~t 1 lN br
j 1_ -4-
-4
11
-i~ 11Ie _1-_=-fl---j-I- shy _ I shy - I +---1-+ +shy10
flfr4 bullbull - -= ~
(WIllA -1 1
~i -I---- I-----fshy~- ~ shy _
IImiddot-~ Ivf ~ - 1
mdashmdash
II-f-i- shy
arsquo ---
~~ ~)I-r- f=r-- f-1-1-+
- --+-+-I-f-of-- - Imiddotmiddot I
Ij---j--+-+--+ -+--+--+ - 1shy -1 bull -1- Ishy-- -+--l-I shy
-+-i~-+-i- I shy - 1shy i shy+
mdashmdashmdash--mdashmdash
I- o- -- shy- l shymdash Imdash--
mdash
mdashmdash
mdash d J t-t--t shy
I-shy_-t- -1-- 1I 1--r-
--t---I---4 -- 1-shy----+--+-+-IIt
c- i i
~ l shyr- I _ - -- middot- 1- -l--+-j f---I-i-shy-
-4-
~ 1shy- shyt-I---1--+- shy I r--1 l--II -f--- l-I--- shy - mdashmdash -mdashmdashmdash
iI- I I--+---f-+- +-1-+ -L I- shyf--I--shy 1---shy mdashf-- shy
i shyI-- i-I
-+-t-~Lt- I--+--+shyl I _- I- ---
I
iIJ I l- Ishy- -
L-
7
___
E ~
l0shy
bullbullbullbullbull
tt tt Kcca ko)a)j -
-( +-+- )
~~ ~~
--I II II
+-+- r4 00~r4~Igt-~TCC ((iii~~ryenLI-~ II I 1 1-0lt1)-- -0 ltIt)
III ii it oo NN
NC
N p-a
I II IS IS Q) ~
lsquo9
~ ~~~ -------- f---- shy---------- f---- shy
S
( +-+- ))C -V
~~
bullbullbull
r
lsquolrsquo lv mdash
Sb Ri t lsquoIrsquo
) t
C bull
I
~
(
n -lsquo
o lot
-h
+-
~ ~ Ii-8
~-~7
0 00
Uu
i I
5 3 ji II tanmdashc lsquomdashlsquo
-C p-LI
p
mdashldquoa
r s lsquoamdash o
Ursquo (
I N I I
lsquo-lsquo mdash a71-
( -h
t +- )
L jlsquo-t LI
C mdash
5 1)--
tiJlsquoI A o zc 1 Q V -1 toslashU-deg rmdashRJ
~ )
8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
___mdashmdash
----
--
--
--
- --
- -
--
--
-
_
mdash mdash
mdash mdash
mdash mdash mdash mdash mdash
mdash mdash
mdash mdash mdash mdash mdash mdash
mdash mdash mdash mdash mdash mdash mdash
---mdash mdash
--
mdashj
mdash
mdash mdash mdash mdash mdash mdash nmdash-Imdash
I lsquo4
amdash
r
d P_li-Ill 3 111
plusmn )iJrfl EZZZZ_______
j-l--f shy
Amdash r I
mdash
Ii aLlTzT [W
amdash-a-Imdash - e mdashmdash -a aa
lsquo
- shy
l-
I shy
-
I 5amp Is
a a I
f 1
-e -lsquo --
utfl wz afl
J bl lsquo r
E uuml4
lsquo AUfl
mdash
1-1-- ---I- --l shy
i- -- - shy
- - -1 I
f- -- shy--I mdash--- - E - ~
il~ E ft~il r~ i 1= l-C l i~ -c~ II
Wrsquoe s ccedilwlsquoj W ~~~E (1C iJ ~h
t_~ ~ ~) Iwl~ 1bull
~ ~lt L
u3 lsquo4E
VI ct 1~~b f--~t 1 lN br
j 1_ -4-
-4
11
-i~ 11Ie _1-_=-fl---j-I- shy _ I shy - I +---1-+ +shy10
flfr4 bullbull - -= ~
(WIllA -1 1
~i -I---- I-----fshy~- ~ shy _
IImiddot-~ Ivf ~ - 1
mdashmdash
II-f-i- shy
arsquo ---
~~ ~)I-r- f=r-- f-1-1-+
- --+-+-I-f-of-- - Imiddotmiddot I
Ij---j--+-+--+ -+--+--+ - 1shy -1 bull -1- Ishy-- -+--l-I shy
-+-i~-+-i- I shy - 1shy i shy+
mdashmdashmdash--mdashmdash
I- o- -- shy- l shymdash Imdash--
mdash
mdashmdash
mdash d J t-t--t shy
I-shy_-t- -1-- 1I 1--r-
--t---I---4 -- 1-shy----+--+-+-IIt
c- i i
~ l shyr- I _ - -- middot- 1- -l--+-j f---I-i-shy-
-4-
~ 1shy- shyt-I---1--+- shy I r--1 l--II -f--- l-I--- shy - mdashmdash -mdashmdashmdash
iI- I I--+---f-+- +-1-+ -L I- shyf--I--shy 1---shy mdashf-- shy
i shyI-- i-I
-+-t-~Lt- I--+--+shyl I _- I- ---
I
iIJ I l- Ishy- -
L-
7
___
E ~
l0shy
bullbullbullbullbull
tt tt Kcca ko)a)j -
-( +-+- )
~~ ~~
--I II II
+-+- r4 00~r4~Igt-~TCC ((iii~~ryenLI-~ II I 1 1-0lt1)-- -0 ltIt)
III ii it oo NN
NC
N p-a
I II IS IS Q) ~
lsquo9
~ ~~~ -------- f---- shy---------- f---- shy
S
( +-+- ))C -V
~~
bullbullbull
r
lsquolrsquo lv mdash
Sb Ri t lsquoIrsquo
) t
C bull
I
~
(
n -lsquo
o lot
-h
+-
~ ~ Ii-8
~-~7
0 00
Uu
i I
5 3 ji II tanmdashc lsquomdashlsquo
-C p-LI
p
mdashldquoa
r s lsquoamdash o
Ursquo (
I N I I
lsquo-lsquo mdash a71-
( -h
t +- )
L jlsquo-t LI
C mdash
5 1)--
tiJlsquoI A o zc 1 Q V -1 toslashU-deg rmdashRJ
~ )
8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms
___
E ~
l0shy
bullbullbullbullbull
tt tt Kcca ko)a)j -
-( +-+- )
~~ ~~
--I II II
+-+- r4 00~r4~Igt-~TCC ((iii~~ryenLI-~ II I 1 1-0lt1)-- -0 ltIt)
III ii it oo NN
NC
N p-a
I II IS IS Q) ~
lsquo9
~ ~~~ -------- f---- shy---------- f---- shy
S
( +-+- ))C -V
~~
bullbullbull
r
lsquolrsquo lv mdash
Sb Ri t lsquoIrsquo
) t
C bull
I
~
(
n -lsquo
o lot
-h
+-
~ ~ Ii-8
~-~7
0 00
Uu
i I
5 3 ji II tanmdashc lsquomdashlsquo
-C p-LI
p
mdashldquoa
r s lsquoamdash o
Ursquo (
I N I I
lsquo-lsquo mdash a71-
( -h
t +- )
L jlsquo-t LI
C mdash
5 1)--
tiJlsquoI A o zc 1 Q V -1 toslashU-deg rmdashRJ
~ )
8
MIT OpenCourseWarehttpocwmitedu
1HWZRUNDQGampRPSXWHU6HFXULWSpring 2014
For information about citing these materials or our Terms of Use visit httpocwmiteduterms