Cryptanalysis

Thursday 23 July 2020, 16:51  #1
Cryptanalysis - Decipher Oracle
jam
jam
  • 99 posts

Hi all,

I have been trying this task in several ways and i know it is an issue of math. Let me tell you what i mean. I got the plain text and i know the ciphered text. The fact that the ciphered text and plain text could be replaced to each other in modulo arithmetic, i might guess in a loop the e*d. It must be a greater number than when i use the force. I could not verify the d.

Is there more math behind or just a problem with the progression...
I read the papers and i must confess the inventors were great men.

Thx for looking around and guessing the magic number.

Thursday 23 July 2020, 18:54  #2
Cryptanalysis - Decipher Oracle
jam
jam
  • 99 posts

Hi guyz,

I have news. There is a way to break down the ciphered message.
At the end, i have seen there is not much to read from the decrypted one.

Edit:


I got the text and i can verify the encrypted one. The problem is this message. Only the half size of it can be verified properly.


We will see.

Friday 24 July 2020, 00:01  #3
Cryptanalysis - Decipher Oracle
jam
jam
  • 99 posts

hi again,

i got it. Zero problem.

As i got some values from net, there was a copy paste problem.

c u

Saturday 25 July 2020, 01:45  #4
[CLOSED] Cryptanalysis - Decipher Oracle
Th1b4ud
  • 1636 posts

Perfect