Code:

 


Let's take a random plaintext:

FLEE AT ONCE, WE ARE DISCOVERED

Now let's reverse the order of each word...
FLEE -> EELF
AT -> TA
ONCE -> ECNO
WE -> EW
ARE -> ERA
DISCOVERED -> DEREVOCSID

So the modified plaintext is as follows:

EELF TA ECNO EW ERA DEREVOCSID

Now let's substitute it with random alphabets...

So the ciphertext becomes:

NNGT XF NYAK NC NUF PNUNZKIMQP

Now again arraging the ciphertext from right to left:

PNUNZKIMQP NUF NC NYAK XF NNGT