Billion Electric Company BiPAC 8500/8520, BiPAC 8501/8521 user manual 109

Billion BiPAC 8500/8501/8520/8521 SHDSL (VPN) Firewall Bridge/ Router

oSHA1: A one-way hashing algorithm that produces a 160−bit hash.

•Encryption: Select the encryption method from the pull-down menu. There are several options, DES, 3DES, AES (128, 192 and 256) and NULL. NULL means it is a tunnel only with no encryption. 3DES and AES are more powerful but increase the latency.

oDES: Stand for Data Encryption Standard, it uses 56 bits as an encryption method.

o3DES: Stand for Triple Data Encryption Standard, it uses 168 (56*3) bits as an encryption method.

oAES: Stand for Advanced Encryption Standards, you can use 128, 192 or 256 bits encryption method.

•Perfect Forward Secrecy: Choose whether to enable PFS using Diffie-Hellman public- key cryptography to change the encryption keys during second phase of VPN negotiation. This function will provide better security, but extends the VPN negotiation time. Diffie- Hellman is a public-key cryptography protocol that allows two parties to establish a shared secret over an unsecured communication channel (i.e. over the Internet). There are three modes, MODP 768-bit, MODP 1024-bit and MODP 1536-bit. MODP stands for Modular Exponentiation Groups.

•Pre-shared Key: This is for the Internet Key Exchange (IKE) protocol, a string from 4 to 128 characters. Both sides should use the same key. IKE is used to establish a shared security policy and authenticated keys for services (such as IPSec) that require a key. Before any IPSec traffic can be passed, each router must be able to verify the identity of its peer. This can be done by manually entering the pre-shared key to the router or hosts at both ends.

Select the Apply button to apply your changes.

109

Chapter 4: Configuration