Cipher
This option defines which cryptographic cipher will be used to secure communcations over this IPsec VPN. Different clients support different ciphers so you are presented with the following ciphers to choose from:
  1. Triple DES: Also known as 3DES this cipher is compatible with nearly every client out there. It is the slowests and probably least secure of all three.
  2. AES (Rijndael): This cipher is probably the most secure of all three and was recently adopoted as a NIST standard for government crypto.
  3. Blowfish: Developed by Bruce Schneier, this cipher is secure and fast.

When in doubt, choose Triple DES. Please refer to your EnGarde documentation for more information on this subject.