simpler rsa

1 files changed, 29 insertions, 0 deletions

diff --git a/final/rsa-decrypt.py b/final/rsa-decrypt.py
new file mode 100644
index 0000000..335ed68
--- /dev/null
+++ b/final/rsa-decrypt.py
@@ -0,0 +1,29 @@
+encrypted = [405, 35, 133, 371, 435, 279] # Directly from demo output of encrypted
+p = 29
+q = 17
+n = p*q
+tot = (p-1)*(q-1)
+e = 3
+
+# Calculate d such that ed == 1 mod tot
+d = 1 # Guess
+while (e*d % tot != 1):
+  d += 1
+# Algorithm is currently extremely dumb
+
+def decrypt_block(blk):
+  return blk**d % n
+
+decrypted = [decrypt_block(block) for block in encrypted]
+
+messagenum = 0
+for block in decrypted:
+  messagenum += block
+  messagenum *= n
+
+message = ''
+while messagenum > 0:
+  message += chr(messagenum%128)
+  messagenum = (messagenum-messagenum%128)//128
+
+print(message)