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Alice 1. GET Bob's home page 2. Fake home page with ET 3. E-(Message) Trudy 4. EB(Message) Figure 8-25 A way for Trudy to subvert public-key encryption. Bob

Alice 1. GET Bob's home page 2. Fake home page with ET 3. E-(Message) Trudy 4. EB(Message) Figure 8-25 A way for Trudy to subvert public-key encryption. Bob

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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Consider the failed attempt of Alice to get Bob’s public key in
Fig. 8-25 . Suppose that Bob and Alice already share a
secret key, but Alice still wants Bob’s public key. Is there now a
way to get it securely? If so, how? 

### Figure 8-25: A Way for Trudy to Subvert Public-Key Encryption This diagram illustrates how an attacker, Trudy, can disrupt the public-key encryption process. The participants involved in the process are Alice, Trudy, and Bob. 1. **Step 1**: Alice initiates the interaction by sending a request to GET Bob's home page. This request is intercepted by Trudy. 2. **Step 2**: Trudy responds to Alice by sending a fake home page, along with her own encryption key, denoted as \( E_T \). 3. **Step 3**: Alice, believing the fake home page to be genuine, sends an encrypted message using \( E_T \) back to Trudy. 4. **Step 4**: Trudy then decrypts Alice's message, re-encrypts it with Bob's encryption key \( E_B \), and forwards it to Bob. This sequence enables Trudy to read and potentially alter the message before it reaches Bob, effectively undermining the security afforded by public-key encryption.
Transcribed Image Text:### Figure 8-25: A Way for Trudy to Subvert Public-Key Encryption This diagram illustrates how an attacker, Trudy, can disrupt the public-key encryption process. The participants involved in the process are Alice, Trudy, and Bob. 1. **Step 1**: Alice initiates the interaction by sending a request to GET Bob's home page. This request is intercepted by Trudy. 2. **Step 2**: Trudy responds to Alice by sending a fake home page, along with her own encryption key, denoted as \( E_T \). 3. **Step 3**: Alice, believing the fake home page to be genuine, sends an encrypted message using \( E_T \) back to Trudy. 4. **Step 4**: Trudy then decrypts Alice's message, re-encrypts it with Bob's encryption key \( E_B \), and forwards it to Bob. This sequence enables Trudy to read and potentially alter the message before it reaches Bob, effectively undermining the security afforded by public-key encryption.
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