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   comp.lang.asm.x86      Ahh, the lost art of x86 assembly      4,675 messages   

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   Message 2,688 of 4,675   
   Rick C. Hodgin to Terje Mathisen   
   Re: BASE64 again   
   16 Jun 17 08:12:55   
   
   From: rick.c.hodgin@nospicedham.gmail.com   
      
   On Friday, June 16, 2017 at 10:42:55 AM UTC-4, Terje Mathisen wrote:   
   > wolfgang kern wrote:   
   > > seems I played this game for too long...   
   > > my brain works still on it even when I sleep :)   
   > > Terje asked for another 2:1 algo:   
   > > I gave up on the hex idea because of the sub 07 and the missing   
   > > first/second indicator, but why not use the given ranges a bit different   
   > > ? So a 4+4 bit algo may use the low nibble of "A...P" (41..50) to   
   > > produce 10..f0 (00 with 50) by shl,4 from first byte and 01..0f of   
   > > "a..p"(61..70) by AND&OR from every second byte.   
   > > in addition I made use of many filler bytes to modify alot:   
   > >   
   > > ZRRh61XPR560PRR4dPjDa-rY1G`Ss$anytext#<=t7r4 > 66hwAX(G%(g/(G3(g8(g9(G0)G1(g:eeee+++   
   > >   
   > > it didn't become shorter than the xor-sub-sub would show with my   
   > > extended use of printable characters. Just an idea    __   
   > > wolfgang   
   >   
   > One of the key requirements is of course that your algorithm must only   
   > use the blessed (MIME) opcodes, this means that SHL/ROL/ROR/ADD/ADC are   
   > all off the table!   
   >   
   > SUB'ing twice was my workaround for this problem while XOR was the   
   > easiest way to combine two bytes.   
      
   Terje, why do place constraints on this task?  Why not let people   
   use whatever they're able and see what they come up with?   
      
   Thank you,   
   Rick C. Hodgin   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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