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This is a Vignere Cipher, with mod 26, with alphabets labelled as A=0, B=1, C=2, ......., Z=25. Only the first 4 letters are used for ciphering.

The formulas for

Encryption:
E=(P+K) mod 26
Decryption:
P=(E-K+26) mod 26

Where,

E = encrypted value
P = plain value
K = key (i.e OSTU = [14,18,19,20])

This is a simple ciphering technique, almost anyone can understand and crack it. This website is for decoration purpose only.