how to send data using crypto keys?

cranium.2003_at_gmail.com
Date: 05/07/05 

Date: 6 May 2005 19:15:27 -0700

hello,
   I want to send my data in encrpted form so that nobody in middle of
data tranmission can intercept that and modify it? which
encryption/decryption algorithm i use? where can i get source code for
that algorithm?
   Can it be possible for me to do that? I want whatever is send from
my pc to other pc must go throgh scramble way not in plaintext?
    Please suggest if this not possible any other ways. Please consider
both pcs are at distant locations. Using Redhat 9 linux.

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