Billion BiPAC 8500/8520 User Manual page 114

Advanced Option
This function is only available after finish creating an IPSec account. Click Advanced Option to
change the following settings:
• IKE (Internet key Exchange) Mode: Select IKE mode to Main mode or Aggressive
mode. This IKE provides secured key generation and key management.
IKE Proposal:
o Hash Function: It is a Message Digest algorithm which coverts any length of a
message into a unique set of bits. It is widely used MD5 (Message Digest) and
SHA-1 (Secure Hash Algorithm) algorithms. SHA1 is more resistant to brute-force
attacks than MD5, however it is slower. SHA1 is more resistant to brute-force
attacks than MD5, however it is slower
o Encryption: Select the encryption method from the pull-down menu. There are
several options, DES, 3DES and AES (128, 192 and 256). 3DES and AES are
Chapter 4: Configuration
Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router
MD5: A one-way hashing algorithm that produces a 128−bit hash.
SHA1: A one-way hashing algorithm that produces a 160−bit hash
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