Tags: rsa crypto

Rating:

TLDR;
- RSA encryption/decryption oracle
- The oracle gives the flag ciphertext and the public modulus
- Just ask for the decryption of c+n where c is the flag ciphertext and n is the public modulus
- Note: The server expects and sends all values as bytes with little endian ordering

Original writeup (https://jsur.in/posts/2020-04-13-dawgctf-2020-writeups#cha-cha-real-smooth).