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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
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.