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UPPCL AE 2018:43

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Which of the following must be done in order to ensure the integrity of your electronic communication?

  1. None of the above
  2. Hash the message without any key, digitally sign the hash, and then send it to the recipient along with the message
  3. Encrypt the message with the public key of the recipient and send the encrypted message
  4. Hash the message with the public key of the recipient, and send the hash value of the message along with the message
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UPPCL AE 2018:40
If in $\text{CIDR}$ notation an $\text{IP}$ address is written as $172.26.17.1/25$, the subnet mask is: $255.255.255.192$ $255.255.255.0$ $255.255.240.0$ $255.255.255.128$
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