A substitution resource can be given in an encrypted format.
Encrypted data can be directly represented in the string of format
as "+=enc:ext::XXXX:" in which the part of XXXX contains the encrypted data.
This format of data is created with "-Fenc" option of DeleGate.
When it is named with the suffix ".cdh" as "+=conf.cdh",
it is decrypted by "Credhy" using the passphrase for decryption
which is specified as the password of
the "config" user.