proof modolu

by hope2009
Tags: modolu, proof
hope2009 is offline
Dec1-09, 08:54 PM
P: 3
In RSA: d_K (y)=y^d mod n and n=pq. Define

d_p=d mod(p-1)

d_q=d mod(q-1)

M_p=q^(-1) mod p
M_q=p^(-1) mod q

x_p=y^(d_p ) mod p
x_q=y^(d_q ) mod q
x=M_p qx_p+M_q px_q mod n

Show that y^d=x mod n
any help would be appraciated, thanks
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farful is offline
Dec15-09, 04:10 PM
P: 56
homework eh?

use fermat's thm to prove y^d = y^(d_p) mod p (same for q)
show x = x_p mod p (same for q)
then use CRT to solve for x

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