(ESP) Consider that we protect a TCP SYN packet using the ESP in the transport mode. A TCP SYN packet just comprises a TCP header which is 20 bytes (i.e., without TCP option). The IP packet header is also 20 bytes long (i.e., without IP option). Moreover, the block size for encryption is 256 bits (e.g., using AES-256), and the hash output’s size for message authentication is 512 bits (e.g., using SHA-1). What is the minimum amount of padding required?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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(ESP) Consider that we protect a TCP SYN packet using the ESP in the transport mode. A TCP SYN packet just comprises a TCP header which is 20 bytes (i.e., without TCP option). The IP packet header is also 20 bytes long (i.e., without IP option). Moreover, the block size for encryption is 256 bits (e.g., using AES-256), and the hash output’s size for message authentication is 512 bits (e.g., using SHA-1). What is the minimum amount of padding required? 

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