Implementing-cryptography-using-python

CHAPTER
3
Classical Cryptography
Authentication protocols need to employ encryption to protect the session from
exposure to intruders; over the past few years, we have heard time and time
again of data breaches that have left user data vulnerable and passwords in the
hands of bad actors. In a secure world, passwords are typically hashed, salted,
and stretched, and electronic communications should be encrypted to ensure
secrecy. Just hashing or encrypting data may not be enough, though. The best
encryption schemes will not protect data from poorly constructed passwords. In
this chapter, you’ll be introduced to password practices, get an understanding
of some common historical cryptography schemes, and learn the Python code
that will bring all the topics together. Specifically, you will gain cryptographic
knowledge as you do the following:
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Explore best practices for passwords
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Explore the basics of encryption schemes
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Explore the use of historical ciphers and their cryptanalysis
■■
Gain an understanding of why it is critical to use well-established
encryption algorithms
Implementing Cryptography Using Python®, First Edition. Shannon W. Bray.
© 2020 John Wiley & Sons, Inc. Published 2020 by John Wiley & Sons, Inc.
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