Digi X2 - Manual (Page 114)

C o n f i g u r a t i o n t h r o u g h t h e w e b i n t e r f a c e
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Enable Authentication
Authentication algorithm
Authentication key: The optional authentication algorithm and associated
authentication key used to authorize access on the VPN tunnel. To specify
authentication, check Enable Authentication and select the matching
authentication algorithm. Enter the authentication key according to the
authentication algorithm. You can specify either an ASCII value using
alphanumerics or a hexadecimal value prefixed by 0x. The authentication key
length depends on the authentication algorithm:
Algorithm Size
Key Length
ASCII Hexadecimal
MD5 128-bit 16 32
SHA1 160-bit 20 40