How to decrypt RSA if ciphertext is less than the modulus and e=3? I'm given a public key. Using openssl rsa ..... I got the public key has the exponent as 3. When I calculated the size of the ciphertext, it is 8 bits smaller than the 2048-bit modulus.

How can I decrypt RSA provided I only have public key and ciphertext?

Let me know if you want the files.
"How can I decrypt RSA provided I only have public key and ciphertext?"

You break e=3 RSA. ​ (See pages 393 to 396.)