Implementing-cryptography-using-python

238 Chapter 8 ■ Cryptographic Applications and PKI
dmsg = ''.join(dr_msg)
print ()
print ("The encrypted message :", en_msg)
print ()
print("Decrypted Message :", dmsg);
print ()
if __name__ == '__main__':
main()
The preceding recipe should take the message “Please do not let the enemy
know our position.” and generate an ElGamal key that is used to encrypt and
decrypt the message. Examine Figure 8.5. The program displays the g a and g k
that is produced along with the g ak .
Figure 8.5: ElGamal key
Elliptic Curve Cryptography
Now that you have a better understanding of how the more traditional algorithms
work using Python, we will examine an alternative approach that is
considered a more efficient type of public-key cryptography: elliptic curve
cryptography, or as it is more simply known, ECC. The security of the cryptosystem
lies within the difficulty of solving discrete logarithms on the field
defined by specific equations computed over a curve; the group of cryptographic
algorithms were introduced in 1985 and were based on the esoteric branch