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In this tutorial, Ahmed, a computer engineer, explains a method to encrypt plain text using a visual approach without creating a 26x26 letter square. He utilizes a single array of letters indexed from 0 to 26, where 'Z' is placed at the beginning. The example plaintext is "to be honored to be," with the key being "relations." He demonstrates the encryption process by calculating the ciphertext for each letter, starting with 'T.' He explains how to find the corresponding indexes and adjust them if the total exceeds 26, ensuring the result stays within the range of the English alphabet. The focus is on simplifying encryption techniques.