Fundamentals of InfoSecadvanced
Compare link encryption and end-to-end encryption using the lesson’s stated advantages and disadvantages.
Answer
Link encryption protects data on network links but may require each hop to decrypt and re-encrypt it. End-to-end encryption protects data toward its final destination, so intermediate systems need not read the protected content. The lesson gives end-to-end encryption flexibility and lower resource requirements as advantages, but notes that headers, addresses, and routing information are not protected. Link encryption can conceal the final destination from an interceptor, but requires keys at each hop and is more computationally expensive.
Explanation
### Why this is right
The lesson contrasts where the protection applies and what intermediate systems must do. End-to-end protection can keep message content protected until the destination, while link encryption operates across network links and can require key handling at intermediate hops.
### The concept
The lesson associates end-to-end encryption with flexibility, application-level choices, and reduced need for each hop to decrypt data. It also notes that headers, addresses, and routing information may remain exposed. Link encryption can protect the final destination information from an interceptor in the described comparison, but every hop needs keys and the approach is more computationally expensive. The names describe different protection scopes, not different kinds of cryptographic keys.
### What a good answer covers
- Explain where link and end-to-end protection applies.
- State that end-to-end protection can leave routing details exposed.
- Explain the per-hop key and processing cost noted for link encryption.
- Compare the flexibility and resource advantages attributed to end-to-end encryption.
### Terms
- **Link encryption**: Protection applied across a communication link, with the lesson describing key handling at hops.
- **End-to-end encryption**: Protection intended to continue to the final destination.
- **Hop**: An intermediate computer or network point that forwards traffic.
- **Header**: Control information in a message, such as addressing or routing details.
### Remember
Ask where data is decrypted and which metadata remains visible when comparing encryption scope.
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