CryptICS

Take elliptic curve E: y2 ≡ x3 + 20x + 21 over ℤ79

Reciprocal value table, if needed
x 1 2 3 4 5 6 7 8 9 10
x-1 mod 79 1 40 53 20 16 66 34 10 44 8
x 11 12 13 14 15 16 17 18 19 20
x-1 mod 79 36 33 73 17 58 5 14 22 25 4
x 21 22 23 24 25 26 27 28 29 30
x-1 mod 79 64 18 55 56 19 76 41 48 30 29
x 31 32 33 34 35 36 37 38 39 40
x-1 mod 79 51 42 12 7 70 11 47 52 77 2
x 41 42 43 44 45 46 47 48 49 50
x-1 mod 79 27 32 68 9 72 67 37 28 50 49
x 51 52 53 54 55 56 57 58 59 60
x-1 mod 79 31 38 3 60 23 24 61 15 75 54
x 61 62 63 64 65 66 67 68 69 70
x-1 mod 79 57 65 74 21 62 6 46 43 71 35
x 71 72 73 74 75 76 77
x-1 mod 79 69 45 13 63 59 26 39