With secret key cryptography, a single key is used for both encryption and decryption. As shown in Figure the sender uses the key (or some set of rules) to encrypt the plain text and sends the ciphertext to the receiver. The receiver applies the same key (or ruleset) to decrypt the message and recover the plain text.
Proofreading means examining your text carefully to find and correct typographical errors and mistakes in grammar, style, and spelling. Usually, for those who do not have time, they hire a professional proofreaders to help them do it. Before You Proofread: Set your text aside for a while (15 minutes, a day, a week) between writing and proofing. Some distance from the text will help you see mistakes more easily.
Proofreading Strategies to Try: 1  Skim your paper, pausing at the words and and or.. Check on each side of these words to see whether the items joined are parallel. 2  If you have several items in a list, put them in a column to see if they are parallel. 3  Listen to the sound of the items in a list or the items being compared.