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Encloak  -- http://www.rebol.net/cookbook/recipes/0023.html-- Carl 
says


Newer versions of REBOL include "cloaking" functions for encrypting 
and decrypting strings. These functions do not provide full strength 
encryption such as Blowfish, AES, or RSA as found in REBOL/Command, 
nevertheless they can be useful for hiding passwords and other values. 
(That's why we call it cloaking rather than encrypting.)

http://user1.matsumoto.ne.jp/~goma/js/blowfish.html

i f i find some time, i will implement the blowfish algorithm a lot 
pmore complex than arc4, can be a good test.

That was a very funny pun on Blowfish :)

If I remember correctly, I was also able to exchange test data that 
was Blowfish encrypted with REBOL but I handled the padding myself:

plain: to binary! text
  
len: remainder length? plain 8

  if 0 < len [

    padding: 8 - len

    insert/dup tail plain to char! padding padding
 
  ]