I am very new to cryptography so I don’t know much about it. I have been given a very large $N$ value and $E$ value to decrypt a ciphertext which was created using a AES 128 key and a IV by using RSA encoding scheme
N = 92001629535369949668182190680140710002429961412439471184834723194899969898404162 82428855806975402440064473888135838545187330646754494062187654035542047167435016 34608863342073173012508616123265965429721791336874605919036975439595316606713189 21259313523852555003517715050369476348174980850810194157624985747443 E = 65537
First I try to brute force attack but it would work,is it because the N value is too big? I found a solution, they say using ECB and PKCS5Padding but what I know ECB is divide the large amount of plaintext into block.
So here come my questions:
- Is there any related in RSA and ECB or the padding scheme?
Is there possible to derive my AES key from the ciphertext given?
Because the key must use to other project
the link here is the program I found online, I edit it a bit and I mange to get my decrypted file but how to find the key value for decryption?
Thank a lot to those who are willing guide me.