Inventor

Platform: CUSTOM | Category: Crypto | Type: Challenge | Difficulty: Medium | OS: N/A | **Author: XESXOR Techniques: Big integer to bytes conversion, Custom base-N decoding with emoji alphabet

Summary

Walkthrough of the CUSTOM Crypto Inventor. Task: Decode custom base29 encoding with emoji alphabet. Solution: Map emojis to positions, convert base-29 number to bytes to reveal the flag.

Description

Custom base29 with emoji alphabet. Map emojis to positions, treat as base-29 number, convert to bytes.

Solution

Parse emoji sequence → base29 digits → big integer → bytes. Decoded Russian text describes flag as 'REDACTED' ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

Key Takeaways / Lessons

• Mastering Big integer to bytes conversion, Custom base-N decoding with emoji alphabet was key to this challenge.
• Always check for common misconfigurations and verify assumptions.

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Crafted by XESXOR Research • 2026-03-08 • CUSTOM • Inventor • Difficulty: Medium