Encrypted and self-destruct messages

Encryption is the technique by which data is changed over into secret code that conceals the data's actual significance. The study of encrypting and decrypting data is called cryptography. 

In computing, decoded information is otherwise called plaintext, and scrambled information is called ciphertext. The recipes used to encode and decipher messages are called encryption calculations, or codes. 

To be successful, a code incorporates a variable as a feature of the calculation. The variable, which is known as a key, is the thing that makes a code's yield special. At the point when an encoded message is blocked by an unapproved element, the gatecrasher needs to figure which figure the sender used to scramble the message, just as what keys were utilized as factors. The time and trouble of speculating this data are what makes encryption a particularly important security instrument.

Self-destruct messages: The ability to have messages disappear forever after a fixed amount of time.

Applications to send self-destructing messages

• Gmail:  Gmail has a confidential mode, which lets you give your sent messages an expiration date. To make this work, Google hosts your self-destructing messages on its own servers instead of shooting them to another one. That allows the company to retain control and delete them after a set period of time. On the off chance that both sender and receiver use Gmail, this cycle works flawlessly, and messages with private mode enacted will look like ordinary messages. However, when the termination date shows up, the body text will vanish, despite the fact that the beneficiary can in any case discover the actual email and see the subject header in their inbox.
• Telegram Messenger: The free communications application Telegram Messenger emphasizes security and effortlessness. As a component of that center, it lets users send and receive messages with expiration dates. To utilize this feature, you'll need to make another chaat in Secret Mode. All messages inside this chat end-to-end encoded, and you'll have the option to set messages to self-destruct, while the receiver at the other end won't advance messages to different contacts. Unlike standard Telegram messages, secret chats won’t sync between different devices, so they will disappear if you switch phones or uninstall the app. 
• Facebook Messenger:  This popular chat app also has a self-destructing messages feature, and its greatest advantage over other platforms on this list is its ubiquity. If you already use the app regularly to stay in touch with your contacts, this is your winner. On application, tap the new message button on the Secret discussion switch in the upper right, and pick a contact. At last, tap the clock symbol inside the message field to set a lapse time for your after messages—it tends to be somewhere in the range of five seconds to a day. The countdown begins as soon as the recipient first opens the message, and when the timer runs out, it’ll disappear. The time limit will stay in place for all subsequent messages until you change it or switch it off.
• Snapchat: Snapchat initially made its name with vanishing photographs and recordings, carrying new ephemerality to web-based media. Nowadays, the application stretches out that training to texts too. On the off chance that you send text, photographs, or recordings straightforwardly to contact, those notes will fall to pieces as a matter of course after they open them. Notwithstanding, anybody in a Snapchat discussion can save a line of text, picture, or video with a long press on it, or screen capture.
• Instagram: Instagram has a vanishing message for mobile devices. It’s called Vanish Mode, and it’ll only be available if you’ve agreed to merge your Instagram and Facebook Messenger chat accounts. To enable vanish mode, you should simply swipe up inside a discussion, anything that is thusly posted will vanish when the talk is shut. At the point when you open it back up, nothing posted in Vanish Mode will be there. Swipe up again to turn it off. Others can take screenshots in Vanish Mode, yet you'll be advised in the event that they do. This choice will likewise appear in Facebook Messenger whenever you've consolidated your records, supplanting the mysterious message alternative we covered previously.

Reference:

https://www.npr.org

Image reference: 

https://protonmail.com