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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.
(Contact list syncs automatically with phonebook contacts) No Tencent QQ: No Threema: No Trillian: Yes Viber •Phone number (Contact list syncs automatically with phonebook contacts) Yes WeChat •Username •Phone number •Phonebook contacts scanning if enabled (sending friend requests are required) WhatsApp: No •Phone number
On April 5, 2016, WhatsApp and Open Whisper Systems announced that they had finished adding end-to-end encryption to "every form of communication" on WhatsApp, and that users could now verify each other's keys. [27] [28] In February 2017, WhatsApp announced a new feature, WhatsApp Status, which uses the Signal Protocol to secure its contents. [29]
Contacts is a computerized address book software included with the Apple operating systems iOS, iPadOS, watchOS and macOS. It includes various cloud synchronization capabilities and integrates with other Apple applications and features, including iMessage , FaceTime and the iCloud service (and previously its predecessor MobileMe ).
1. From the top menu bar, click Mail | select Address Book. 2. Select the contact you want to edit. 3. Click the Edit drop down button. 4. Click Edit Contact & update your contact’s info in the text fields.
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In cryptography, the Double Ratchet Algorithm (previously referred to as the Axolotl Ratchet [2] [3]) is a key management algorithm that was developed by Trevor Perrin and Moxie Marlinspike in 2013. It can be used as part of a cryptographic protocol to provide end-to-end encryption for instant messaging .
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