Exam (318).pdf - Question Answer ElGamal Cryptosystems \u00e2\u20ac\u00a2 It is a public key cryptography That is it uses two different keys(public-private key

# Exam (318).pdf - Question Answer ElGamal Cryptosystems...

This preview shows page 1 - 3 out of 3 pages.

Question: Answer : ElGamal Cryptosystems: â€¢ It is a public key cryptography. That is, it uses two different keys (public-private key pair) for encryption and decryption. â€¢ Its implementation is based on the discrete logarithm which is based on primitive roots calculation. â€¢ In ElGamal masking of plaintext is done with for the creation of plaintext. â€¢ Value of is created by the sender and is created by the receiver and are kept secret from each other and to others. â€¢ Consider a very large prime number , primitive root and an integer then, . â€¢ If , and values are given it is not easy to calculate the discrete logarithm problem . a. Consider, the value of Assume the value of and , then calculate as follows: Therefore, the value of  #### You've reached the end of your free preview.

Want to read all 3 pages?

• Spring '17
• John DOe
• Cryptography, public key cryptography, encrypted data of the given plaintext
• • •  