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Find the Z10's reversible value set

• 1,3,5,7,9

• 3,7,9

• 1,3,7,9

• 5,7,9

Which of the following numbers is equal to 9 when modulo is equal to 5

• -12

• -10

• -11

• -13

Which of the following numbers is equal to -132 when modulo is equal to 5

• -12

• -13

• -11

• -10

How many reversible elements does episode Z13 have?

• 12

• 11

• 10

• 13

Public key certificates are used for

• Applications in the block code system

• Provide a public key

• Provide the secret key

• Use a private public key

In public-key cryptography, what is the public key used for?

• decryption and signature generation

• decryption and signature generation

• decryption and signature generation

• Encryption and signature generation

In the following code systems, the public encryption system is the code system

• Lock only people in the transmission group

• The key is conventionally for the sender and the receiver

• Keyless encrypted messages

• The key is divided into 2 parts, 1 part is made public and the rest is kept secret

Given that a=6 is the reversible element in Z8

• Have

• Not

Find the inverse of 3 in Z8

• 4

• 3

• 2

• 1

According to Kirchoff's law, the algorithm of encryption and decryption

• Need to be secret to enemies

• No need for secrets to enemies

• Need for secrecy for encryption algorithm

• Need for secrecy for the decryption algorithm