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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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Study the diagram below showing the steps for Bob to send a digitally signed
message to Alice and then answer the questions that follow:

The statements below are the text version of the illustrated steps
(step one to step five in the diagram above).
Read each statement (step) and then correct all that are false.
These are the steps for Bob to send a digitally signed message to
Alice:

Step Number	Statement
1	After creating a memo, Alice generates a hash on it.
2	Bob then encrypts the hash with a public key. This encryption is a digital signature of the hash.
3	Bob only sends the digital signature to Alice.
4	When Alice receives them, she descripts the digital signature using Bob’s public key, revealing the hash.
5	Alice then hashes the memo with the different hash algorithm Bob used and compares the result to the hash she received from Bob.

You have verified that the correct keys have been used either encrypting and/or
decrypting the digital signatures as well as the correct has algorithm is used to hash
the memo.
Explain the implications of the following scenarios:
If Alice could not decrypt the digital signature.
If, after Alice hashing the memo, the hashes are not equal.

Hash
Step 1
Encryption
algorithm
Step 2
Plaintext
algorithm
Confidential Memo
Layoffs at the Lakeview
store will begin.
Confidential Memo
Layoffs at the Lakeview
store will begin.
386%43@we Digital
Q19)(Ox872. signature
Hash
93827653
Bob (sender)
Bob's private key
Step 3
Transmitted to
remote user
Hash
algorithm
Encryption
algorithm
Alice (receiver)
Confidential Memo
Layoffs at the Lakeview
Confidential Memo
Layoffs at the Lakeview
store will begin.
386%43@we| Digital
Q19(Ox872. signature
Hash
93827653
store will begin.
Hash 93827653
Step 4
Bob's public key
Hashes match
Step 5

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