IB Computer Science Topic A2.4.4 Process of Encryption and Digital Certificates Revision Notes (SL/HL)

IB Computer Science Topic A2.4.4 Process of Encryption and Digital Certificates Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Symmetric and Asymmetric Cryptography

Symmetric Cryptography

Single Key: Uses a single key for both encryption and decryption.
Speed: Generally faster due to simpler algorithms.
Key Distribution: Requires secure key exchange, which can be challenging.

Example

Consider Jane and Tim want to communicate securely.
They use a shared secret key to encrypt and decrypt messages.
If a hacker obtains this key, they can read all communications.

Asymmetric Cryptography

Key Pair: Involves a public key (for encryption) and a private key (for decryption).
Security: Solves the key distribution problem, as the public key can be shared openly.
Speed: Slower due to complex mathematical operations.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Duis aute irure dolor in reprehenderit

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Note

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Excepteur sint occaecat cupidatat non proident

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Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Symmetric and Asymmetric Cryptography

Symmetric Cryptography

Single Key: Uses a single key for both encryption and decryption.
Speed: Generally faster due to simpler algorithms.
Key Distribution: Requires secure key exchange, which can be challenging.

Example

Consider Jane and Tim want to communicate securely.
They use a shared secret key to encrypt and decrypt messages.
If a hacker obtains this key, they can read all communications.

Asymmetric Cryptography

Key Pair: Involves a public key (for encryption) and a private key (for decryption).
Security: Solves the key distribution problem, as the public key can be shared openly.
Speed: Slower due to complex mathematical operations.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic A2.4.4: Process of Encryption and Digital Certificates Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

Symmetric and Asymmetric Cryptography

Symmetric Cryptography

Asymmetric Cryptography

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Symmetric and Asymmetric Cryptography

Symmetric Cryptography

Asymmetric Cryptography

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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