rcrypt lets you encrypt and decrypt files using the Rijndael algorithm.

How do you use it?
To encrypt a file: rcrypt -e <key> <inputfile> [<outputfile>] 
or: cat file | rcrypt -e <key> > file.encrypted
To decrypt a file: rcrypt -d <key> <inputfile> [<outputfile>] 
or: cat file.encrypted | rcrypt -d <key> > file.plaintext

Feature or Bug?
Encrypt the same file with the same key, output is different every
time (this is in rcrypt.c, has nothing to do with Rijndael). 

The rcrypt homepage is located at:

	http://farm9.com/content/Free_Tools/Rcrypt