Up shift means cipher letter is directly above plain letter.

QWERTY rows: Row1: q w e r t y u i o p Row2: a s d f g h j k l ; Row3: z x c v b n m , . / / But known trick: sometimes it's for encryption

Row 1: q w e r t y u i o p Row 2: a s d f g h j k l ; Row 3: z x c v b n m , . /

But known trick: sometimes it's for encryption , so to decrypt, shift right .

f → right shift = g y → right shift = u l → right shift = ; (no).

If encryption = left shift of plain: plain f → left neighbor = d (cipher). So cipher d means plain f . We have cipher f , so plain = right neighbor of f = g. That’s not “film”.

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Up shift means cipher letter is directly above plain letter.

QWERTY rows: Row1: q w e r t y u i o p Row2: a s d f g h j k l ; Row3: z x c v b n m , . /

Row 1: q w e r t y u i o p Row 2: a s d f g h j k l ; Row 3: z x c v b n m , . /

But known trick: sometimes it's for encryption , so to decrypt, shift right .

f → right shift = g y → right shift = u l → right shift = ; (no).

If encryption = left shift of plain: plain f → left neighbor = d (cipher). So cipher d means plain f . We have cipher f , so plain = right neighbor of f = g. That’s not “film”.