eeddaann · July 26, 2018 23:15 · Jul 26, 2018
diff --git a/cryptimer.py b/cryptimer.py
@@ -0,0 +1,47 @@
+from Crypto.Cipher import AES
+import random
+
+MIN_CIPHER = 1000000000000000
+MAX_CIPHER = 1000000000010000
+PLAIN_TEXT = 'test some plain text here'.rjust(32)
+
+
+### encrypt ###
+def generate_ciphers(ciphers_len):
+    return [str(random.randint(MIN_CIPHER, MAX_CIPHER)) for i in range(ciphers_len)]
+
+def encrypt(ciphers_len=100,plain_text=PLAIN_TEXT):
+    ciphers = generate_ciphers(ciphers_len)
+    hashes = []
+    msg = plain_text
+    hashes.append(hash(msg))
+    for i in ciphers:
+        cipher = AES.new(i,AES.MODE_ECB)
+        msg = cipher.encrypt(msg) # encrypt the msg
+        hashes.append(hash(msg)) # save the hash of the msg
+    return msg, hashes # TODO: write to file for backup
+
+def get_bruteforce_rate():
+    '''
+    return decryptions per second on average, for tuning encryption's parameters
+    '''
+    pass
+
+### decrypt ###
+def decrypt(encrypted_msg,hashes):
+    msg = encrypted_msg
+    for i in hashes[::-1]: # iterates over hashes, reversed since the last hash should be decrypted first
+        j=MIN_CIPHER
+        while j<MAX_CIPHER:
+            cipher = AES.new(str(j),AES.MODE_ECB)
+            candidate_msg = cipher.decrypt(msg) # try to decrypt
+            if hash(candidate_msg) == i: # if we found the right hash we can continue to the next hash
+                msg = candidate_msg
+#                print "hash found!"
+                break
+            j+=1
+    return msg 
+
+### main ###
+encrypted_msg,hashes = encrypt()
+print decrypt(encrypted_msg,hashes)
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