Question
If using secret keys for user keys, and sending a multi-recipient message, why is encrypting the MD of the message with the secret key associated
If using secret keys for user keys, and sending a multi-recipient message, why is encrypting the MD of the message with the secret key associated with the recipient a more efficient MAC than doing a keyed MD of the message (again, using the secret key associated with the recipient)?
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Computer Networking A Top-Down Approach
Authors: James F. Kurose, Keith W. Ross
5th edition
136079679, 978-0136079675
