Slide 27
Slide 27 text
ECDSAͩͱॺ໊ूͰ͖ͳ͍ʁ
2ਓͷॺ໊ऀ
s1
, R1
, c, a1
, x1
, X1
s2
, R2
, c, a2
, x2
, X2
͜ͷͱ͖ɺҎԼ͕Γཱͭ
g
s1
=R1
X1
a1*c
, g
s2
=R2
X2
a2*c
s=s1
+s2
, R=R1
R2
, X~=X1
a1
X2
a2
ͱ͢Δͱɺลʑಉ࢜Λ͔͚ͯ
g
s
=R1
X1
a1*c
R2
X2
a2*c
=R1
R2
X1
a1*c
X2
a2*c
=R(X1
a1
X2
a2
)
c
=RX~
c
(͜ͷٯͷূ໌ඞཁͳͣɻٯཱ͠ͳ͍ʁ)