(libc.info.gz) Trivial Encryption

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 5.10 Trivial Encryption
 =======================
 
 The 'memfrob' function converts an array of data to something
 unrecognizable and back again.  It is not encryption in its usual sense
 since it is easy for someone to convert the encrypted data back to clear
 text.  The transformation is analogous to Usenet's "Rot13" encryption
 method for obscuring offensive jokes from sensitive eyes and such.
 Unlike Rot13, 'memfrob' works on arbitrary binary data, not just text.
 
    For true encryption,  Cryptographic Functions.
 
    This function is declared in 'string.h'.
 
  -- Function: void * memfrob (void *MEM, size_t LENGTH)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      'memfrob' transforms (frobnicates) each byte of the data structure
      at MEM, which is LENGTH bytes long, by bitwise exclusive oring it
      with binary 00101010.  It does the transformation in place and its
      return value is always MEM.
 
      Note that 'memfrob' a second time on the same data structure
      returns it to its original state.
 
      This is a good function for hiding information from someone who
      doesn't want to see it or doesn't want to see it very much.  To
      really prevent people from retrieving the information, use stronger
      encryption such as that described in  Cryptographic
      Functions.
 
      *Portability Note:* This function is unique to the GNU C Library.
 
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