conventional encryption with passphrase remaining blank?

[vedaal@lok.com]

is it possible to conventionally encrypt a file, but leave the passphrase blank?

the purpose of this would be to have a signed file, and the detached signature bundled as one

ordinarily, if one receives a signed and encrypted file, and then decrypts it,
the signature automatically verifies

in a signed file, with a detached signature, there is always the possibility
of the signature being lost / stored in a separate area, than the signed file,
with difficulties in verifying it at a later date

a signed and encrypted file, that would be conventionally encrypted with a 'null' passphrase, would serve to keep the file and signature always together,
and also speed the verification process.

would such an option be possible?

with Respect,


vedaal