scripting - encrypting and decrypting a message.

[matfishe]

I am having a lot of trouble with a question that requires me to encrypt a message and decrypt a message. the question is:

create a file called makesecret and readsecret. makesecret takes the content of the file msg-norm and performs some encoding to the message to scramble it up and outputs the encrypted message to the file msg-mixed. readsecret then decrypts the msg-mixed file back to the origional message. (hints: tr, sed; use multiple layers of encryption to mix them up more or try creating a "shared key" that can be shared separately to decode the message).

if anyone can help with this question it would be greatly appreciated.

[hugortega]

openssl does the job:

To encrypt the input file:

openssl bf  -in input_file -out cryp_file

To decrypt the file:

openssl bf -d -in cryp_file -out output_file

Much more secure than simply scramble the contents... or is that a school homework??

[matfishe]

yes, this is just a preparation question for a test next week. I think in the hints section of the question Im suppose to use those commands i.e. tr and sed.