The cache is not at the posted coordinates.
This toy cipher is a variation of a one-time pad (OTP), a well known and theoretically uncrackable stream cipher.
For this specific cipher, encryption / decryption is performed using simple modular subtraction and addition respectively.
cipher text = (plain text – key) mod N / plain text = (cipher text + key) mod N
The variable 'N' is the number of symbols to be used by the cipher. While most online ciphers only use the standard 26-letter alphabet this cipher uses a 40-symbol alphabet.
This alphabet includes 10 digits, 26 letters, and 4 additional symbols: comma, minus, period, and space: "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ,-. "
The above description should be sufficient for you to derive the 3 messages below. This description is essentially what I used with a free online AI tool to create the java script-based HTML application I used to implement this cipher.
| ct = GY4.TVOE20BV4L2OKEHCV.B |
| key = 7931DGEZ24P8SK0HJVRQFAUNY |
| pt = |
| ct = UK7Y5M8UU 58QGXCC6WJEE |
| key = BKL59H-JG43XD76WT.EUQZAMO |
| pt = |
| ct = 09-05 V1-VY,YWV0.02.3 |
| key = Pi [3.141.......] |
| pt = |
Congratulations to first solver LydiaSimmons and first finder In The Vault.
