scrypt lets you encrypt and decrypt files using the Serpent algorithm. 

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

The scrypt homepage is located at:

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