Implementing-cryptography-using-python

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Chapter 9 ■ Mastering Cryptography Using Python 259fd = open("client_public_key.pem", "wb")fd.write(public_key)fd.close()# decrypt using RSAdef decrypt_rsa(ciphertext):key = RSA.importKey(open('client_private_key.pem').read())cipher = PKCS1_OAEP.new(key)plaintext = cipher.decrypt(ciphertext)return plaintext# encrypt using RSAdef encrypt_rsa(message):key = RSA.importKey(open('client_public_key.pem').read())cipher = PKCS1_OAEP.new(key)ciphertext = cipher.encrypt(message)plaintext = decrypt_rsa(ciphertext)return ciphertext# check client commandsdef check_client_command(data):if data == b'addPKI':gen_rsa_certs()return 11elif data == b'removePKI':usePKI = Falsereturn 10return 1# check server commandsdef check_server_command(data):if data == b'addPKI':return 11if data == b'removePKI':useDH = Falsereturn 10return 1ExecutionThe execution of the PKI solution will appear to work just as the original versiondid. Once you type addPKI, the client sends the message to the server unencryptedand then modifies the data to state “PKI Encryption enabled!” Thisshould pop up in the command window for the server, as shown in Figure 9.5.
260 Chapter 9 ■ Mastering Cryptography Using PythonFigure 9.5: PKI Encryption enabledIn addition, Wireshark should encrypt addPKI using the client private key.This will convert the message to 512 bytes. While you will be able to find theUDP packet just as you did in the previous section, this time, the data going overthe wire is encrypted; your Wireshark output should look similar to Figure 9.6.Figure 9.6: Wireshark output
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ImplementingCryptography UsingPytho
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To Stephanie, Eden, Hayden, and Ken
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viAbout the Authorbook, Shannon is
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Contents at a GlanceIntroductionxvi
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xiiContentsUsing Conditionals 16Usi
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xivContentsPseudorandomness115Break
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xviContentsInstalling and Testing W
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xviiiIntroductionprivacy advocates.
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CHAPTER1Introduction to Cryptograph
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Chapter 1 ■ Introduction to Crypt
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CHAPTER2Cryptographic Protocolsand
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Chapter 2 ■ Cryptographic Protoco
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66 Chapter 3 ■ Classical Cryptogr
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CHAPTER4Cryptographic Mathand Frequ
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Chapter 4 ■ Cryptographic Math an
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CHAPTER5Stream Ciphers and Block Ci
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Chapter 5 ■ Stream Ciphers and Bl
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CHAPTER6Using Cryptography with Ima
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Chapter 6 ■ Using Cryptography wi
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200 Chapter 7 ■ Message Integrity
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Page 222 and 223: 208 Chapter 7 ■ Message Integrity
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Page 290 and 291: IndexSYMBOLS\ (backslash), 10- oper
Page 292 and 293: Index ■ D-D 279CIA Triad, 35-36ci
Page 294 and 295: Index ■ I-M 281hashlib module, 28
Page 296 and 297: Index ■ Q-S 283Preneel, Bart, 145
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