CoinGate Challenges

Do you think you know all about Bitcoin, crypto, and related technologies? Take part in our challenges, test your knowledge, and win some bits!

Back to Challenges

CoinGate Challenge #15

Status
Solved
Award
0.05 BTC
Address
1MMBrNVspHgJQT4NrbVRYnQuaCJjqVLnTX
Reddit Topic
https://www.reddit.com/r/Bitcoin/comments/70hrsr/solve_riddles_win_bitcoins_coingate_challenges/
g_gd``````gbg_gh`g``gg`_afgadaah_cd5`3`_dce_f7_4haa3dha3f5f6d4_d`6hf_aad_fg`he_4_d_gg__d_fe4d_h``cgeed`2___ae2daag_7de`__dgg`f_3
CoinGate

Solution

To solve the challenge, several steps were needed:
  1. Decode the string with ROT47.
  2. Decode the answer from the first step with ROT5 (only numbers get rotated).
  3. XOR the answer from the second step together with hash (SHA256) of the word "CoinGate". This word was hidden in the source code of the page and marked as "password".
  4. Take the first letter of the result from the third step, skip the next 33 symbols, take the symbol after that, skip the next 33 symbols, etc. If arriving at end of the string, continue from the beginning of the string, until the private key is formed.


Comments