QUESTION 10 How to encrypt a message with hashing? O Impossible. First concatenate a security key with some additional values, then XOR the results with the message O Hash the message, then rehash the result. Repeat multiple times. O First concatenate the message with a security key, then hash them together.

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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QUESTION 10
How to encrypt a message with hashing?
O Impossible.
O First concatenate a security key with some additional values, then XOR the results with the message
Hash the message, then rehash the result. Repeat multiple times.
O First concatenate the message with a security key, then hash them together.
QUESTION 11
If it has become feasible to use brutal force solution to try almost up to 200 random messages and to obtain identical message digests, what is t
minimum number of bits should a hash be in order to remain secure?
Transcribed Image Text:QUESTION 10 How to encrypt a message with hashing? O Impossible. O First concatenate a security key with some additional values, then XOR the results with the message Hash the message, then rehash the result. Repeat multiple times. O First concatenate the message with a security key, then hash them together. QUESTION 11 If it has become feasible to use brutal force solution to try almost up to 200 random messages and to obtain identical message digests, what is t minimum number of bits should a hash be in order to remain secure?
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