Fortinet 100A - Manual (Page 249)

VPN Phase 1 advanced settings
FortiGate-100A Administration Guide 01-28007-0068-20041203
249
Phase 1 advanced settings
Figure 122:Phase 1 advanced settings
P1 Proposal Select the encryption and authentication algorithms that will be used to
generate keys for protecting negotiations.
Add or delete encryption and authentication algorithms as required. Select a
minimum of one and a maximum of three combinations. The remote peer
must be configured to use at least one of the proposals that you define.
You can select any of the following symmetric-key algorithms:
•
DES-Digital Encryption Standard, a 64-bit block algorithm that uses a 56-
bit key.
• 3DES-Triple-DES, in which plain text is encrypted three times by three
keys.
• AES128-A 128-bit block algorithm that uses a 128-bit key.
• AES192-A 128-bit block algorithm that uses a 192-bit key.
• AES256-A 128-bit block algorithm that uses a 256-bit key.
You can select either of the following message digests to check the
authenticity of messages during phase 1 negotiations:
•
MD5-Message Digest 5, the hash algorithm developed by RSA Data
Security.
• SHA1-Secure Hash Algorithm 1, which produces a 160-bit message
digest.
To specify a third combination, use the add button beside the fields for the
second combination.