README.md

Asymmetric Encryption CTFs

"guess what" CTF

Challenge Description

Find the missing parameter using BIGNUM primitives.

Key Instructions

1. Convert the given hex strings to BIGNUMs.
2. Perform BIGNUM operations to find the missing parameter.
3. Print the result as a colon-separated hex string surrounded by CRYPTO25{}.

Example Code

Refer to the asym.c file for the implementation details.

Additional Resources

• OpenSSL BIGNUM Documentation
• Asymmetric Cryptography