The BEST APP for Securing your WhatsApp and all messages in the AppStore:
PRIVACY
Your messages belong to you and not everybody who uses your iPhone should be able to read them. With Code for WhatsApp nobody except you will be able to read your messages or view your private photos and videos. Simply import any conversation you choose to keep private into the app and you are all set.
Are you afraid that your GF/BF will check your phone?
Are you afraid that someone will send you secret messages?
Are you afraid that a stranger will open your Whatsapp chats and drive your phone crazy?
-Password protect all of your WhatsApp-messages
-Protect your WhatsApp messages with your own fingerprint or password.
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Disclaimer:
Unofficial Product. This application is the sole creation and responsibility of the developer. This application is not endorsed by or affiliated with WhatsApp Inc. WhatsApp Messenger, its name, trademark, and other aspects of the app are trademarked and owned by their respective owners.