Information Security and Cryptography - Security in Computer Networks
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You must import the Jama-1.0.3.jar file for Hill Cipher. You can download the file from this repository or website.
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You must import the Java-mail-1_2.jar file for sending mail. You can download the file this repository, Oracle's website or .jar repositories.
Website : http://math.nist.gov/javanumerics/jama/
Website : http://www.oracle.com/technetwork/java/javamail/index-138643.html