Brute Force

// to crack http://codegolf.stackexchange.com/a/103227/42091
var atob=require('atob');
var h=(w,s='H e l l o, W o r l  d!')=>eval(w).join('')==='Hello,World!'
var a=[25,0,0,0,0,0,0,0,3,2,3];
var e=atob('ISYgJiAtOkI8Qk97BRBeaxZFShoUZSsiOGkMenNy').split('').map(c=>c.charCodeAt());
var j=(a,x)=>{for(x=0;!a[x];x++);if(a.length-x>1){a[0]=a[x]-1;a[x]=(x==0?a[x]:0);a[x+1]++;if(x>3)console.log(a)}else{a[0]=a[x]+1;a[x]=0;i=0}}
var f=(a,e,k=0)=>e.map((c,i)=>String.fromCharCode(c^(k+=a[i%11]))).join('')
var g=(o,a,b=!0)=>{try{b=!h(o);console.log(a);console.log(o)}catch(e){}return b}
while(g(f(a,e),a))j(a)