A plaintext message was converted into a string of 2-digit numbers using the following table (it has 99-10+1 = 90 entries):
10: space 11: a 12: b 13: c 14: d 15: e 16: f 17: g 18: h 19: i 20: j 21: k 22: l 23: m 24: n 25: o 26: p 27: q 28: r 29: s 30: t 31: u 32: v 33: w 34: x 35: y 36: z 37: . 38: , 39: ; 40: : 41: ? 42: ! 43: ( 44: ) 45: $ 46: # 47: - 48: [ 49: ] 50: 0 51: 1 52: 2 53: 3 54: 4 55: 5 56: 6 57: 7 58: 8 59: 9 60: + 61: = 62: % 63: ^ 64: & 65: * 66: { 67: } 68: \ 69: ' 70: ` 71: A 72: B 73: C 74: D 75: E 76: F 77: G 78: H 79: I 80: J 81: K 82: L 83: M 84: N 85: O 86: P 87: Q 88: R 89: S 90: T 91: U 92: V 93: W 94: X 95: Y 96: Z 97: < 98: > 99: carriage return (end of line)These 2 digit numbers were then grouped into blocks of 6 digits, and encrypted using the formula