Implementing-cryptography-using-python

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Chapter 1 ■ Introduction to Cryptography and Python 29Figure 1.4: Module methodsNow that you understand the importance of Python modules, let’s importthe hashlib library and then use the MD5 and SHA message digests. Type thefollowing in Python:>>> import hashlib>>> hashlib.md5('hello world'.encode()).hexdigest()'5eb63bbbe01eeed093cb22bb8f5acdc3'>>> hashlib.sha512('hello world'.encode()).hexdigest()'309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f'NOTEare hashed.Python 3 and higher require that Unicode objects be encoded before theyCreating a Reverse CipherFor this next exercise, we build on what we have learned in this chapter by creatinga function named reverseCipher that accepts one parameter: plaintext.We can then call our function and pass the plaintext into it and print out thereturn ciphertext. Our method modifies the plaintext so that the ciphertext isthe complete reverse:def reverseCipher(plaintext):ciphertext = ''i = len(plaintext) - 1while i >= 0:ciphertext = ciphertext + plaintext[i]i = i - 1return ciphertextplaintext = 'If you want to keep a secret, you must also hide it fromyourself.'ciphertext = reverseCipher (plaintext)print(ciphertext)This code should produce the following result:.flesruoy morf ti edih osla tsum uoy ,terces a peek ot tnaw uoy fI
30 Chapter 1 ■ Introduction to Cryptography and PythonSummaryIn this chapter, you were introduced to the use of cryptographic algorithms.Most of the functions that you will construct throughout the course of this bookwill follow the format of having functions to GEN (generate a key), ENC (encryptplaintext to ciphertext), and DEC (decrypt ciphertext to plaintext). This chapteralso offered a few options on building your Python. You also were given anoverview of the Python concepts that you will need to know prior to taking oncomplicated applications. The chapter concluded with you writing your firstcipher code that took plaintext and returned the reverse.
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Page 4 and 5: To Stephanie, Eden, Hayden, and Ken
Page 6 and 7: viAbout the Authorbook, Shannon is
Page 8 and 9: Contents at a GlanceIntroductionxvi
Page 10 and 11: xiiContentsUsing Conditionals 16Usi
Page 12 and 13: xivContentsPseudorandomness115Break
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Page 16 and 17: xviiiIntroductionprivacy advocates.
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80 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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224 Chapter 8 ■ Cryptographic App
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CHAPTER9Mastering CryptographyUsing
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Chapter 9 ■ Mastering Cryptograph
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IndexSYMBOLS\ (backslash), 10- oper
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Index ■ D-D 279CIA Triad, 35-36ci
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Index ■ I-M 281hashlib module, 28
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Index ■ Q-S 283Preneel, Bart, 145
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