Warmup

Platform: CUSTOM | Category: Crypto | Type: Challenge | Difficulty: Easy | OS: N/A | **Author: XESXOR Techniques: Base64 decoding

Summary

Walkthrough of the CUSTOM Crypto Warmup. Task: Base64 encoded file. Solution: Decode with base64.b64decode() to reveal the flag.

Description

File contains Base64 encoded text about Base64 usage.

Solution

base64.b64decode() reveals text ending with 'Flag is: REDACTED' ‍​‌‌​​‌​​​‌‌​​‌​​​​‌‌​‌​​​​‌‌‌​​‌​​‌‌​​​‌​​‌‌‌​​​​​‌‌​‌‌​​​‌‌​​​​‍

Key Takeaways / Lessons

• Mastering Base64 decoding 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 • Warmup • Difficulty: Easy