Hier ein Tool gegen das Whatsapp.
http://threema.ch/de/
Es soll sicherer sein weil es:
Threema distinguished in that it is very safe. Threema use a 255 bit long asymmetric Elliptic curve cryptography (ECC) which is comparable to 2048 bit RSA. This key is used to derive a unique 256 bit symmetric key for every single message. The XSalsa20stream cipher encrypts the message eventually. Moreover is the communication between the server and the device encrypted. To the message is added a 128 bit message authentication code to detect manipulations as well as a random amount of padding to prevent that inferences can be made to the content.
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