I was chatting with a friend, and a message poped up, saying that messages on the conversation ware safe. I clicked that message, and it said this feature was able if both parts of the conversation had last update. When my friend checked my profile, it said that I had to update Whatsapp to use that feature, but I have last update installed.
Something is not right.
Apr 23, 2016, 9:50:03 AM via Website
Apr 23, 2016 9:50:03 AM via Website
You got this because of new WhatsApp update which now enables End-to-end encryption of WhatsApp messages. Only when both the parties are updated to latest version with end-to-end encryption then only the chats are completey safe. Most probably, in your case it was your friend who was not on latest version of WhatsApp.
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Hope this helps.