I have used AES CTR mode of operation. Each time a file is uploaded an encrypted file is obtained and the corresponding cipher is got – this is a mini project I have done.
I wanted to know so as to what methods I could use to
validate the cipher to just prove that it is a valid cipher got by the actual encryption technique and not just the one generated by some random number generation method
it would be better if I can get a tool that subjects cipher to attacks (brute force, letter frequency analysis) to just prove that the cipher is secure (for validation purpose).
I am aware of the NIST validation, but since this is a mini project, I wanted some simpler solution. Does anyone please have suggestions?