**One-Way Authentication Technique Using Asymmetric Encryption**Consider a one-way authentication technique based on asymmetric encryption:1. **A → B:** \(ID_A\)2. **B → A:** \(E(PU_B, R_2)\)3. **A → B:** \(R_2\)---**a. Explain the protocol.**In this protocol, user A initiates the authentication by sending their identity \(ID_A\) to user B.- User B responds by sending back an encrypted challenge \(R_2\) using B's public key \(PU_B\).- User A decrypts the challenge using B's public key and returns the original challenge \(R_2\) to user B.- The purpose of this exchange is for B to verify that A has the capability to read messages encrypted with B's public key. **b. What type of attack is this protocol susceptible to?**This protocol is susceptible to a replay attack. An attacker could intercept the messages and replay the sequence to gain unauthorized access or pose as user A.

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Answered: Consider a one-way authentication…

Consider a one-way authentication technique based on asymmetric encryption: A B: IDA B-A: E(PUR₂) A-B: R₂ a. Explain the protocol. b. What type of attack is this protocol susceptible to?

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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Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.

Question

**One-Way Authentication Technique Using Asymmetric Encryption**

Consider a one-way authentication technique based on asymmetric encryption:

1. **A → B:** \(ID_A\)

2. **B → A:** \(E(PU_B, R_2)\)

3. **A → B:** \(R_2\)

---

**a. Explain the protocol.**

In this protocol, user A initiates the authentication by sending their identity \(ID_A\) to user B.

- User B responds by sending back an encrypted challenge \(R_2\) using B's public key \(PU_B\).
- User A decrypts the challenge using B's public key and returns the original challenge \(R_2\) to user B.
- The purpose of this exchange is for B to verify that A has the capability to read messages encrypted with B's public key.

**b. What type of attack is this protocol susceptible to?**

This protocol is susceptible to a replay attack. An attacker could intercept the messages and replay the sequence to gain unauthorized access or pose as user A.

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