People who are interested in low-level language implementation might wish to lea...

shagie · on Jan 15, 2023

There was that old RSA in a sig file...

    #!/bin/perl -sp0777i<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<j]dsj
    $/=unpack('H*',$_);$_=`echo 16dio\U$k"SK$/SM$n\EsN0p[lN*1
    lK[d2%Sa2/d0$^Ixp"|dc`;s/\W//g;$_=pack('H*',/((..)*)$/)

You'll note on that last line a |dc` as all of that stuff after the `echo` gets packed into something for dc to run.

http://www.cypherspace.org/adam/rsa/rsa-details.html