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WhatsApp (officially WhatsApp Messenger) is an American instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [13] It allows users to send text, voice messages and video messages, [14] make voice and video calls, and share images, documents, user locations, and other content.
A hidden message is information that is not immediately noticeable, and that must be discovered or uncovered and interpreted before it can be known. Hidden messages include backwards audio messages, hidden visual messages and symbolic or cryptic codes such as a crossword or cipher .
In computer science, information hiding is the principle of segregation of the design decisions in a computer program that are most likely to change, thus protecting other parts of the program from extensive modification if the design decision is changed.
The Samsung Messages client brands the RCS capability as chat features, and displays Enter chat message in the message box. [21] Starting in 2024, Samsung Messages is no longer coming preloaded on Galaxy phones sold in the United States market in favor of Google Messages. [22] In January 2025, Samsung Messages was removed from the Google Play ...
The Signal applications on Android and iOS can be locked with the phone's pin, passphrase, or biometric authentication. [126] The user can define a "screen lock timeout" interval, where Signal will re-encrypt the messages after a certain amount of time, providing an additional protection mechanism in case the phone is lost or stolen.
Telegram offers end-to-end encryption in voice and video calls, [10] and in optional private chats, which Telegram calls Secret Chats. Telegram also has social networking features, allowing users to post stories , create large public groups with up to 200,000 members, or share one-way updates to unlimited audiences in so-called channels.
In July 2020, Facebook added a new feature in Messenger that lets iOS users to use Face ID or Touch ID to lock their chats. The feature is called App Lock and is a part of several changes in Messenger regarding privacy and security.