Suppose we have public key encryption system with E the encryption function and Dµ the decryption function, where Er is publicly known for a key k and Dµ is secret. Suppose further that the composition of the operations E, and Dg is com- mutative: E o Dr = Dx o Ex. Propose a simple way to implement authenticating messages using components of this encryption system. Answer: to send a signed message r we compute and send: ....

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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(b) Suppose we have public key encryption system with E the encryption function
and Dr the decryption function, where Er is publicly known for a key k and Dx is
secret. Suppose further that the composition of the operations E and Dµ is com-
mutative: Er o Dr = Dx o Ex. Propose a simple way to implement authenticating
messages using components of this encryption system.
Answer: to send a signed message x we compute and send:
Transcribed Image Text:(b) Suppose we have public key encryption system with E the encryption function and Dr the decryption function, where Er is publicly known for a key k and Dx is secret. Suppose further that the composition of the operations E and Dµ is com- mutative: Er o Dr = Dx o Ex. Propose a simple way to implement authenticating messages using components of this encryption system. Answer: to send a signed message x we compute and send:
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