Question: 29.26 - In some VPN systems, a sender appends a random number of extra zero bits to a da- tagram before encrypting, and the receiver

29.26 - In some VPN systems, a sender appends a random number of extra zero bits to a da- tagram before encrypting, and the receiver uses the datagram length field to discards the extra bits after the datagram has been decrypted. Thus, the only effect of the random padding is to make the length of the encrypted datagram independent of the length of the unencrypted version. Why is the length important?

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