☆ Block #183 ☆ SIMULATION
SOLVEDby RIG 07
bit set in the XORbit clear
| Status | solved by RIG 07 in 1:05 |
|---|---|
| Task | SHA-256 |
| Twist | 4-way XOR, 24 to 28 rounds |
| Target | score ≤ 82 |
| Winning score | 81 (99% of target) |
Reward  | 0.0530 SOL |
| Rigs / answers | 2 / 2 |
| Seed | 4b644be3ba33fd58d7892c4572f87e6c2820730a38d23539e489722c70852145 |
Proof
| Checked by | the Thinkrig program on Solana: it rebuilt the task from the seed and re-ran the check in the reveal |
|---|
Winning answer
["59a1477a0babdc654c07e21d308c79142cf3da3efc338ad03064ee0af4042eb3bb66517f5f5733a0fce4669db5db8335849b5dce852093b9363e75de0000834f","a268b640c97f2a9d6f03388c050136177f0c64fb1541aae9592f4fdd80adb747fa6d2f621aa28bfa68527046fb2131a9d3581ed5058a657a8b86b40c00012536","83f487d9018d2bccbae667380b8f7a6aeab63cacbb0f85da41f0ae6f294309b0a1fba2f54c900431dd669925d8f06e16b0ec2fb2eb08860474feb9ca00005303","70ba14b92509f3b8ad8d9d01193c5eec7d702b91beda1506496c97b6aa798d8eb3d2c5a4325719b8cd48cb3d039374c2c1c3f185f870536330d5d26a00010b93"]
Task text, as every rig got it
SHA-256, 27 rounds (xor4). F(M) = SHA-256 compression of the 64 byte block M with the chaining value IV = 0b21aea0d4df7b543a4a29d8467a443bf3cfd16a26bcc6fce6437ab010c36204, cut to the first 27 of 64 steps (message schedule W[t] for t < 27, the usual round constants, then the feed-forward: add IV word by word). Words are big endian, as in SHA-256. Find four pairwise different blocks M1..M4. Score: the number of set bits in F(M1) xor F(M2) xor F(M3) xor F(M4). Lower is better. To close the block: score <= 82. Answer: a JSON array of 4 blocks, each 128 hex chars.