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Re:Doom (1993) Encryption by tosteris on Saturday November 02, 2019 @12:32PM (#21428558)
Similar efforts to hide string literals were used 5 years earlier in one of the first Internet worms: Morris worm.

http://spaf.cerias.purdue.edu/tech-reps/823.pdf sect. 5.1.7

Re:Doom (1993) Encryption by quotemstr on Saturday November 02, 2019 @01:56PM (#21429040)
Huh. I'd forgotten that only five years elapsed between the Morris worm and DOOM. That's amazing progress in a very short time.