**How to work enc function:**
1. Encode string to base64
2. Create a new string from the encoded one by applying xor to each character: 
    `new [i] = base64_encoded [i] ^ base64_encoded [i + 1]` 
3. Convert the result to hex
**How to work decode:**
1. Convert the hex string to bytes (`binascii.unhexlify`)
2. Know first char     1. If you don't know it just repeat algorithm for each base64 alphabet's chars
3. `base64_encoded [i + 1] = base64_encoded [i] ^ new [i]` 
solution script: [solution.py](https://github.com/wetox-team/writeup/blob/master/hacktivitycon/tyrannosaurus_rex/solution.py)
flag is `flag{tyrannosauras_xor_in_reverse}`