Encryption basics in Intro to Computing - Flowchart & Logic Diagram

Process Overview

Encryption is a way to keep information secret by changing it into a code that only someone with the right key can read. This process helps protect messages from being understood by others.

Flowchart

Get Plain Text

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Choose Encryption Key

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Apply Encryption Algorithm

Yes No↓

Send Encrypted Text

This flowchart shows the basic steps of encryption: starting with plain text, choosing a key, applying the encryption algorithm, checking if encryption is done, and then sending the encrypted message.

Step-by-Step Trace - 5 Steps

Step 1: Start with the plain text message 'HELLO'.

Step 2: Choose an encryption key, for example, key = 3.

Step 3: Apply the encryption algorithm (e.g., Caesar cipher shifting letters by 3).

Step 4: Check if encryption is complete.

Step 5: Send the encrypted text 'KHOOR' to the receiver.

Diagram

Encryption Algorithm

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Receiver uses Key to Decrypt

This diagram shows how the plain text is turned into encrypted text using a key and then back to plain text by the receiver using the same key.

Flowchart Quiz - 3 Questions

What is the purpose of the encryption key?

A To check spelling mistakes

B To send the message faster

C To change the message into a secret code

D To print the message

Key Result

Encryption turns readable messages into secret codes using a key, protecting information from others.