Company's blog. All types of your communication either its text, group or media sharing is now protected by AES 256. Whitepaper on the WhatsApp end-to-end encryption can be found here.
This announcement by WhatsApp diverted the attention of the privacy and security advocates from FBI vs Apple towards WhatsApp. But according to Jonathan Zdziarski, a leading independent security researcher and forensics expert.
End to end encryption is a good thing, but it’s really just the beginning of good securityWhen WhatsApp announced this, Lot of people think that "o my goodness, I'm too much secure now and no one can read my WhatsApp chat now." But trust me its not like that. You are still vulnerable.
Tunnel is secure but not the endpoints: When experts look deeply into the cryptographic functions used by the WhatsApp, they found that the transferring of messages is secured by the Encryption but not the data storage in the devices - the endpoints unlike the Apple's iPhone. In simple words, If you are carrying a secret device in a truck then the truck is secure but not the point from where you loaded the truck and the point where you will unload it.
Feds care about Metadata not the Content: Your metadata is sent unencrypted which contains the information like to whom you are sending this message, at what time, how many messages etc. This information is enough for the Federal agents to eavesdrop into your messages.
Feel free to ask any queries.