private_key = 67
public_key = pow(
generator, private_key, modulo
) # Create public key based off power of generator ^ private % modulo
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((HOST, PORT)) # Create socket to assigned IP and port
s.listen() # Begin listening on socket
conn, addr = s.accept(
) # Assign conn and addr variables when socket is reached
print('Connection from:', addr) # Print connected host address
client_public_key = conn.recv(1024)
print('Received client public key:', int(client_public_key))
conn.sendall(str(public_key).encode())
shared_secret = pow(int(client_public_key), private_key, modulo)
print('Shared secret:', str(shared_secret))
message = ''
while True:
message += str(conn.recv(1024).decode())
if not conn.recv(1024):
break
print('Received cipher text:', message)
decrypted = caesarCipher.caesar(message, shared_secret, 'd')
print('Decrypted cipher text:', decrypted)
s.close()
clientConn.sendall(str(public_key).encode())
clientSharedSecret = pow(int(client_public_key), private_key, modulo)
print('Alice\'s shared secret:', str(clientSharedSecret))
### RECEIVE MESSAGE FROM ALICE ###
clientMessage = ''
while True:
clientMessage += str(clientConn.recv(1024).decode())
if not clientConn.recv(1024):
break
print('Received cipher text:', clientMessage)
serverSocket.close()
### DECRYPT AND MANIPULATE RESPONSE FROM ALICE ###
decryptedClientMessage = caesarCipher.caesar(clientMessage, clientSharedSecret,
'd')
print('Decrypted cipher text:', decryptedClientMessage)
manipulatedMessage = decryptedClientMessage.replace('dawn', 'noon')
print('Manipulated Message:', manipulatedMessage)
# Impersonates Alice and acts as a client for Bob
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as clientSocket:
### ESTABLISH CONNECTION WITH BOB ###
clientSocket.connect((HOST, client_PORT))
clientSocket.sendall(str(public_key).encode())
server_public_key = clientSocket.recv(1024).decode()
print('Received Bob\'s public key:', str(server_public_key))
serverSharedSecret = pow(int(server_public_key), private_key, modulo)
print('Bob\'s Shared secret:', serverSharedSecret)
# Simple Caesar cipher brute force program import caesarCipher alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789!@#$%/.' message = '6@ $2a2/.zb/4 ya a5ya a6!2 y 0#!$960ya21 .a/b4492 dy. z26@4 0y//621 #@ d6a5 4/2ya2/ 52ya a5y@ 2c2/ 6@ a52 56452.a 06/092., z2ad22@ a52 $y/a62. #3 /[email protected], a52 3/2@05, !y/fy 321#/#c@y, a52 A.y/2c605, y@1 #a52/., 1/#d@21 y. b.by9 zf a52 zbgg6@4 #3 a52 0#b/a 1/#@2.x Zba a52 0y9!, 9beb/6#b. 9632 #3 $2a2/.zb/4, 0#@02/@21 #@9f yz#ba $5y@a#!. y@1 /23920a6#@. #3 /2y9 9632, d2@a #@ 6@ 6a. #91 dyf y@1 !y12 6a 5y/1, 2e02$a zf y 4/2ya 233#/a, a# /2y96g2 a52 1y@42/ y@1 a52 163360b9a $#.6a6#@ #3 a52 /b..6y@ $2#$92x A52/2 d2/2 a52 .y!2 /202$a6#@. y@1 zy99., a52 .y!2 3/2@05 a52ya2/, a52 .y!2 0#b/a 6@a2/2.a. y@1 .2/c602 6@a2/2.a. y@1 6@a/64b2. y. b.by9x #@9f 6@ a52 c2/f 56452.a 06/092. d2/2 yaa2!$a. !y12 a# 822$ 6@ !6@1 a52 163360b9a62. #3 a52 y0aby9 $#.6a6#@x .a#/62. d2/2 d56.$2/21 #3 5#d 16332/2@a9f a52 ad# 2!$/2..2. z25yc21 6@ a52.2 163360b9a 06/[email protected] A52 2!$/2.. !y/fy, 0#@02/@21 3#/ a52 d293y/2 #3 a52 05y/6ayz92 y@1 21b0ya6#@y9 [email protected]#@. b@12/ 52/ $ya/#@y42, 5y1 46c2@ 16/20a6#@. a5ya a52f .5#b91 y99 z2 /2!#c21 a# 8ygy@, y@1 a52 a56@4. z29#@46@4 a# a52.2 [email protected]#@. 5y1 y9/2y1f z22@ $y0821 b$x A52 2!$/2.. 296.yz2a5, 5#d2c2/, d52@ y.821 d5ya [email protected]/b0a6#@. .52 d#b91 z2 $92y.21 a# 46c2- d6a5 52/ 05y/y0a2/6.a60 /b..6y@ $ya/6#a6.! 5y1 /2$9621 a5ya .52 0#b91 46c2 @# 16/20a6#@. yz#ba .aya2 [email protected]#@. 3#/ a5ya dy. a52 y33y6/ #3 a52 .#c2/264@, zba y. 3y/ y. .52 $2/.#@y99f dy. 0#@02/@21 .52 d#b91 z2 a52 9y.a a# %b6a $2a2/.zb/4x' # Checks every key based on length of the alphabet for key in range(len(caesarCipher.alphabet)): print(key, '--->', caesarCipher.caesar(message, key, 'd'))
import caesarCipher
import socket
HOST = '127.0.0.1' # Local IP
PORT = 65432 # Assigned Port
generator = 1024
modulo = 199
private_key = 56
public_key = pow(generator, private_key, modulo)
message = 'This message is encrypted using Caesar cipher.'
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((HOST, PORT))
s.sendall(str(public_key).encode())
server_public_key = s.recv(1024).decode()
print('Received server public key:', str(server_public_key))
shared_secret = pow(int(server_public_key), private_key, modulo)
print('Shared secret:', shared_secret)
cipher = caesarCipher.caesar(message, shared_secret, 'e')
s.sendall(str(cipher).encode())
s.close()
conn, addr = s.accept() # Accept connections and store the address
print('Connection from', addr) # Print the Connection to screen
client_public_key = conn.recv(
1024) # Store the public key up to buffer size 1024
print('Received client public key:',
int(client_public_key)) # Print client pub key to screen
conn.sendall(str(
public_key).encode()) # Send UTF-8 encoded server public key to client
shared_secret = pow(int(client_public_key), private_key,
modulo) # Generate shared secret
print('Shared secret=' +
str(shared_secret)) # Print shared secret to screen
message = ''
while True:
message += str(conn.recv(1024).decode(
)) # Decode UTF-8 encoded text received from client and add to message
if not conn.recv(
1024): # Break connection when no more text is being sent
break
print('Received cipher text:',
message) # Print received cipher text message
decrypted = caesarCipher.caesar(
message, shared_secret,
'd') # Call cipher to decode message with shared secret
print('Decrypted cipher text:',
decrypted) # Print decrypted text to screen
s.close()
import socket
import caesarCipher
HOST = '127.0.0.1'
PORT = 17777
generator = 2048
modulo = 199
private_key = 145
public_key = pow(generator, private_key, modulo)
meetingTimeMessage = 'Meet me at dawn'
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((HOST, PORT)) # Connect to server on host:port
s.sendall(str(public_key).encode()) # Send UTF-8 encoded public key to server
server_public_key = s.recv(1024).decode() # Store UTF-8 decoded server public key that was received
print('Received server public key:', str(server_public_key)) # Print the server's public key
shared_secret = pow(int(server_public_key), private_key, modulo) # Generate shared secret from received pub key
print('Shared secret:', shared_secret) # Print shared secret
encryptedMessage = caesarCipher.caesar(meetingTimeMessage, shared_secret, 'e') # Call cipher to encrypt text to be sent
s.sendall(str(encryptedMessage).encode()) # Send all the encrypted text to server