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In this task, we would like to generate a keyed hash (i.e. MAC) for a file. We can use the “-hmac” option (this option is currently undocumented, but it is supported byopenssl). The following example generates a keyed hash for a file using the HMAC-MD5 algorithm. The string following the “-hmac” option is the key. “openssl dgst -md5 -hmac "abcdefg" filename” Please generate a keyed hash using HMAC-MD5, HMAC-SHA256, and HMAC-SHA1 for any file that you choose. Please try several keys with different lengths. 1. Do we have to use a key with a fixed size in HMAC? 2. If so, what is the key size? 3. If not, why?

In this task, we would like to generate a keyed hash (i.e. MAC) for a file. We can use the “-hmac” option (this option is currently undocumented, but it is supported byopenssl). The following example generates a keyed hash for a file using the HMAC-MD5 algorithm. The string following the “-hmac” option is the key. “openssl dgst -md5 -hmac "abcdefg" filename” Please generate a keyed hash using HMAC-MD5, HMAC-SHA256, and HMAC-SHA1 for any file that you choose. Please try several keys with different lengths. 1. Do we have to use a key with a fixed size in HMAC? 2. If so, what is the key size? 3. If not, why?

Database System Concepts
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
Section: Chapter Questions
Problem 1PE
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In this task, we would like to generate a keyed hash (i.e. MAC) for a file. We can use the “-hmac” option (this option is currently undocumented, but it is supported byopenssl). The following example generates a keyed hash for a file using the HMAC-MD5 algorithm. The string following the “-hmac” option is the key. “openssl dgst -md5 -hmac "abcdefg" filename” Please generate a keyed hash using HMAC-MD5, HMAC-SHA256, and HMAC-SHA1 for any file that you choose. Please try several keys with different lengths. 1. Do we have to use a key with a fixed size in HMAC? 2. If so, what is the key size? 3. If not, why?

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