2.3

Encryption

9 flashcards to master Encryption

Smart Spaced Repetition

Rate each card Hard, Okay, or Easy after flipping. Your progress is saved and cards are scheduled for optimal review intervals.

Definition Flip

Define the term 'encryption'.

Answer Flip

Encryption is the process of converting plaintext into ciphertext to protect its confidentiality. This scrambling of data prevents unauthorized access.

Definition Flip

Explain the purpose of 'decryption'.

Answer Flip

Decryption is the reverse process of encryption, converting ciphertext back into readable plaintext. It requires the correct key to restore the original data.

Definition Flip

What is a 'cipher' in the context of encryption?

Answer Flip

A cipher is an algorithm used to perform encryption or decryption.

Example: the Caesar cipher is a simple substitution cipher.
Definition Flip

Differentiate between 'plaintext' and 'ciphertext'.

Answer Flip

Plaintext is the original, unencrypted data, while ciphertext is the encrypted, unreadable form of the data after encryption. Plaintext is transformed into ciphertext.

Key Concept Flip

Outline the key difference between 'symmetric' and 'asymmetric' encryption.

Answer Flip

Symmetric encryption uses the same key for both encryption and decryption, while asymmetric encryption uses a public key for encryption and a private key for decryption. Symmetric is faster, asymmetric is more secure for key exchange.

Definition Flip

Explain the purpose of a 'public key' in asymmetric encryption.

Answer Flip

The public key is used to encrypt data and can be freely distributed. Anyone can use the public key to encrypt a message, but only the holder of the corresponding private key can decrypt it.

Definition Flip

Explain the purpose of a 'private key' in asymmetric encryption.

Answer Flip

The private key is kept secret and is used to decrypt data that was encrypted with the corresponding public key. It ensures that only the intended recipient can read the message.

Key Concept Flip

Describe the role of SSL/TLS in securing online communications.

Answer Flip

SSL/TLS (Secure Sockets Layer/Transport Layer Security) are protocols that provide secure communication over a network by encrypting data transmitted between a web server and a browser. They use a combination of symmetric and asymmetric encryption.

Key Concept Flip

Explain why encryption is important for data security.

Answer Flip

Encryption protects sensitive information from unauthorized access by rendering it unreadable. This is vital for maintaining privacy and confidentiality, especially when transmitting data over public networks.

Review the material

Read revision notes with definitions, equations, and exam tips.

Read Notes

Test yourself

Practice with MCQ questions to check your understanding.

Take Quiz
2.2 Error detection and correction 3.1 Computer architecture

Key Questions: Encryption

Define the term 'encryption'.

Encryption is the process of converting plaintext into ciphertext to protect its confidentiality. This scrambling of data prevents unauthorized access.

Explain the purpose of 'decryption'.

Decryption is the reverse process of encryption, converting ciphertext back into readable plaintext. It requires the correct key to restore the original data.

What is a 'cipher' in the context of encryption?

A cipher is an algorithm used to perform encryption or decryption.

Example: the Caesar cipher is a simple substitution cipher.
Differentiate between 'plaintext' and 'ciphertext'.

Plaintext is the original, unencrypted data, while ciphertext is the encrypted, unreadable form of the data after encryption. Plaintext is transformed into ciphertext.

Explain the purpose of a 'public key' in asymmetric encryption.

The public key is used to encrypt data and can be freely distributed. Anyone can use the public key to encrypt a message, but only the holder of the corresponding private key can decrypt it.

About Encryption (2.3)

These 9 flashcards cover everything you need to know about Encryption for your Cambridge IGCSE Computer Science (0478) exam. Each card is designed based on the official syllabus requirements.

What You'll Learn

How to Study Effectively

Use the Study Mode button above to test yourself one card at a time. Try to answer each question before flipping the card. Review cards you find difficult more frequently.

Continue Learning

After mastering Encryption, explore these related topics: