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CompTIA Security+ study material · question 545 of 611

Why do protocols such as TLS use asymmetric cryptography only to establish a symmetric session key?

  1. Because asymmetric algorithms cannot encrypt large messages at all
  2. Because symmetric encryption is far faster for bulk data
  3. Because symmetric keys cannot be exchanged securely
  4. Because asymmetric keys expire more quickly
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Answer: B. Because symmetric encryption is far faster for bulk data

Asymmetric operations solve the key distribution problem; symmetric ciphers then carry the traffic efficiently.

Source: RFC 8446 (IETF) — RFC 8446 § 1 Introduction

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