Complex sentence: IKE phase 1 purpose is to establish a secure authenticated communication channel by using Diffie-Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications, this negotiation results in one single bi-directional ISAKMP Security Association (SA).
Split into simpler sentences: IKE phase 1's purpose is to establish a secure authenticated communication channel by using the Diffie-Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications. This negotiation results in one single bi-directional ISAKMP Security Association (SA).