BDBG

Boneh-durfee go brrrr and then you can reverse the other function easily since its just XOR

line = "101110100011010000110010100100000011001110110001010101100101000000100111011010010010110101000101000110000100011001001100111011111011101001110111100001100011101010101111101100001000010111111000110110110010110100000001001011100010011000110100111100001100111001101110001111001100010001001111100110110110100001011100011100110101001000011100100011011110011000010100110010100111000010101101110101011100010110000100001101101101001111000101011100101100100110110011101000100010101000010001010010110110101011111101110011101110010000101001000111000000100100001010110111001011110001010100100001101111010010111101111001001001111010001100000111000010000100110101100010001111100011111100100100001010010100111010100010000101110000110101000101100"
n = 9
msg = [line[i:i+n] for i in range(0, len(line), n)]


r=3945132
p =12019806956467800913778611206246062087922374347970383926984004278168670921911203657163080865199043522716298571169006826814578568813815787765574990776255283
q = 11391686090403905599695015583829755003551766728158057028281938682097322841603835874354540607209988671617182359012432600907514677996087087987893334356043831
n= p*q

bs = 9
r=3945132
x=pow(r,2,n)
c = ''
for i in range(81):
    x=pow(x,2,n)
    p=(bin(x)[2:])[-bs:]
    c_i=int(p,2)^int(msg[i],2)
    ci_bin = format(c_i, '0' + str(bs) + 'b')
    c+=ci_bin

print(c)

Flag: FwordCTF{boneh_and_blum?_mix3d_but_good_j0b!!}