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The general consensus is that they are 'insecure' with a custom crypto and custom protocol (MTProto).

• przmk 8y ago
  On the other hand, the $300,000 bounty for cracking Telegram encryption has yet to be claimed.
  • fxfan 8y ago
    But but everybody says "you cannot roll out your own crypto" so we should just stop trying anything new I think /s