SNES Game Genie encryption works as such:


SNES GG code format: XXYY-YYYY, where XX is the value, and YY-YYYY is the address.


First, we must run the code through a transposition cipher, and convert it to normal hex:

Code: D F 4 7 0 9 1 5 6 B C 8 A 2 3 E
Hex: 0 1 2 3 4 5 6 7 8 9 A B C D E F

After this is finished, the value (XX) is now in plain text. However, the address (YY-YYYY) is still encrypted, using another transposition cipher. Save the value for later, convert each hex digit of the address to binary, and run the 8-bit result through the following cipher:

Code: ijklqrst opabcduv wxefghmn
Clear: abcdefgh ijklmnop qrstuvwx



Example:



SNES GG code: ABCD-EFFF



A = C
B = 9
C = A
D = 0
E = F
F = 1
F = 1
F = 1

C9A0-F111

C9 = decrypted value; next we solve for the decrypted address:


A0 = 10100000
F1 = 11110001
11 = 00010001

10100000 11110001 00010001

Code: ijklqrst opabcduv wxefghmn = 10100000 11110001 00010001
Clear: abcdefgh ijklmnop qrstuvwx = 11000100 10100111 00000100 = C4 A7 04

Hence, the decrypted value is C9, and the decrypted address is C4A704. (C4A704:C9)