The following message was encoded using a simple algorithm:
!kzsaain zhps V !vW
Please try to explain how it works.
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It was encrypted using a ROT variant and written backwards.
The ROT variant starts with e mapped to z then as it descends through the alphabet the encrypted characters ascend. When it reaches p, it skips one letter, presumably to avoid being invertible. Then once it runs out of letters at the end z is mapped to a.
e f g h i j k l m n o p q r s t u v w x y z
z y x w v u t s r q p n m l k j i h g f e a
The first 4 letters of the alphabet appear to be excluded.