Complex sentence: Signal instant messages are encrypted with the Signal Protocol (formerly known as the Axolotl protocol), which combines the Double Ratchet Algorithm, prekeys, and a 3-DH handshake.
Split into simpler sentences: Signal instant messages are encrypted with the Signal Protocol (formerly known as the Axolotl protocol). The protocol combines the Double Ratchet Algorithm, prekeys, and a 3-DH handshake.