The authentication keys for the trusted contacts will be monitored and if they change at some point in the future, the padlock for those conversations will turn to red.

When they verify the identity of their contacts and mark them as trusted, a green padlock will appear. When end-to-end encryption is used Viber users will see a grey padlock in their chats and calls. It provides strong privacy and security for voice or video calls, text messages and videos and photos exchanged by users in both group and one-to-one conversations. Viber's end-to-end encryption feature is available in the application's latest version - 6.0 - for Android, iOS, PCs and Macs. It also means that companies like WhatsApp and Viber Media will be unable to comply with law enforcement requests for the content of their customers' chats or audio calls. This means that even if a provider's servers are breached by hackers, they won't be able to view unencrypted user communications. End-to-end encryption systems like those implemented by WhatsApp and now Viber allow user devices to establish a secure communications channel directly, making it impossible for anyone else to see the unencrypted data.

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