Encrypt File Without PGP

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Use the Unix crypt command.

This requires an agreed on password shared between those who will have access to the file. crypt encrypts and decrypts the contents of a file. crypt reads from the standard input and writes on the standard output. The password is a key that selects a particular transformation. If no password is given, crypt demands a key from the terminal and turns off printing while the key is being typed in. crypt encrypts and decrypts with the same key:

example% crypt password < clear.file > encrypted.file
example% crypt password < encrypted.file | more

will display the contents of clear.file.