Doom cheat code encryption
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Dan Tobias (Talk | contribs) (Created page with "{{FormatInfo |formattype=electronic |subcat=Encryption |released=1993 }} '''Doom cheat code encryption''' was used in the original 1993 version of Doom to make the cheat codes...") |
Revision as of 15:05, 2 November 2019
Doom cheat code encryption was used in the original 1993 version of Doom to make the cheat codes a little harder for hackers to find, so they didn't appear in the raw binary code as plain ASCII characters. Twitter user @Foone described it in a 2019 thread.
This low-grade encryption is done by shifting the bits of 8-bit numbers (which can represent single ASCII characters) which reverses the order of the bits except for those representing 4 and 32. The shifted values are stored in a lookup table in the Doom program.
