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Cambridge IGCSE Computer Science practice

Paper 1 structured question: Encryption

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Attempt questionEncryption revisionRevise the key idea

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Encryption

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Paper 1Computer Systems3 marks

Understanding encryption is essential for data security in computer systems.

Description

Roles of Keys in Encryption

In asymmetric encryption, the public key is used for encryption, and the private key is used for decryption. In symmetric encryption, the same key is used for both processes.

  1. a

    Explain the roles of public and private keys in asymmetric encryption.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Encryption

Paper 1Computer Systems1 marks

Description

Encryption Methods

There are two primary methods of encryption: symmetric and asymmetric. Symmetric encryption uses the same key for both encryption and decryption, while asymmetric encryption uses a pair of keys: a public key and a private key.

  1. a

    State the main difference between symmetric and asymmetric encryption.

    Aim for approximately 1 distinct marking point.

    [1]