library(polynom)
library(HomomorphicEncryption)Set some parameters.
d = 4
n = 2^d
p = (n/2)-1
t = p
q = 868
pm = GenPolyMod(n)Set a working seed for random numbers
Create the secret key and the polynomials a and e, which will go into the public key
# generate a secret key
s = GenSecretKey(n)
# generate a
a = GenA(n, q)
# generate the error
e = GenError(n)Generate the public key.
pk0 = GenPubKey0(a, s, e*p, pm, q)
pk1 = GenPubKey1(a)Create a polynomial message
# create a message
m = polynomial( coef=c(1, 1, 1) )Create polynomials for the encryption
# polynomials for encryption
e1 = GenError(n)
e2 = GenError(n)
u = GenU(n)Generate the ciphertext
ct0 = pk0*u + p*e1 + m
ct0 = ct0 %% pm
ct0 = CoefMod(ct0, q)
ct1 = pk1*u + p*e2
ct1 = ct1 %% pm
ct1 = CoefMod(ct1, q)Decrypt
decrypt = (ct1 * s) + ct0
decrypt = decrypt %% pm
decrypt = CoefMod(decrypt, q)
decrypt = CoefMod(round(decrypt), p)
print(decrypt)
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