RCD Challenge

Are you ready for the RCD-2019 challenge?

Let’s find out!

Challenge 1. Solve the puzzle:

• 2E 7E 48 5F 41 45 45 44 5F 52 7E 2E 74 68 70 74 3A 73 2F 2F
• 69 73 2E 65 6F 72 72 2F 64 63 30 32 39 31 4C 2F 6E 69 38 65
• 7E 36 5F 2E 4F 46 54 4F 52 45 2E 5F 7E

Challenge 2. Solve the puzzle:

• 114 156 116 065 131 130 112 171 131 123 102 060 132 127 143 147 144 103 144 165 132 107
• 154 153 111 107 126 157 111 107 126 172 144 127 106 152 132 125 111 147 120 062 112 166
• 141 151 102 172 141 127 147 147 144 107 154 061 143 123 102 171 132 127 061 164 131 130
• 112 156 142 063 112 167 111 107 126 157 144 103 102 153 141 127 121 147 145 127 150 130

Challenge 3

The keys of a block cipher are 5-tuples (a, b, c, d, e) such that:

a²+b²+c²+d²+e²= 2011²⁰¹⁹

1. Find a key.
2. Are there any keys such that all the component values are odd numbers?

Please send us the solutions at rcd@sie.ro, until September 10.
The first (correct) solutions will be awarded during the conference.