[dm-crypt] Note: Characters inadvisable in Passphrases

Arno Wagner arno at wagner.name
Fri Jul 8 23:11:00 CEST 2011

Hi all,

after somebody ran into this revently, I think a general warning
might be a good idea (already in the FAQ):

If you use characters that are not in the first 128 positions 
of the ASCII table, these character may change encoding, e.g. 
when upgrading. In the specific case, it went from an ASCII 
character in the 129-255 range to a 3 byte UTF-8 character. 
Needless to say the passphrase did not work anymore.

So it is highly advisable to stay within the 94 printable 
characters on the standard, 128 character ASCII table. The
table can e.g. be found here: http://en.wikipedia.org/wiki/ASCII

Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

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