I don't understand why you claim that TextSecure is designed by cryptographers. From what I've seen, they use something called the "Axolotl Ratchet", developed

I don't understand why you claim that TextSecure is designed by cryptographers. From what I've seen, they use something called the "Axolotl Ratchet", developed by Trevor Perrin. Here are some resources: https://www.hnsearch.com/search#request/all&q=by%3Atptacek+trevor https://www.hnsearch.com/search#request/all&q=by%3Atptacek+t... https://www.whispersystems.org/blog/advanced-ratcheting/ https://www.whispersystems.org/blog/advanced-ratcheting/ https://pond.imperialviolet.org/ https://pond.imperialviolet.org/