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CTF Tools & Tips

Open-Source Intelligence
Number & Text Conversion
Cryptography
RSA Calculator http://nmichaels.org/rsa.py
XOR Calculator https://xor.pw/
Online Text Converter https://www.asciitohex.com/
Image / Steganography
Image searching https://yandex.com/
Image Layer analysis & Cheatsheet https://www.aperisolve.com/
Online Photo Editor https://www.aperisolve.com/
Web
/robots.txt
Enumeration
Ghidra reverse engineering tool https://ghidra-sre.org/
GDB Memory debugging tool https://www.kali.org/tools/gdb-peda/