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This is a 4096 Bit RSA CryptoSystem which requires a java runtime environment on your machine, that it is Java Built, unlike the previous which was .NET. Used for limited ammount of Text, as the keys are quazi keys - often not real and will not do for bulk encryption. It uses Java's BigInteger class which is efficient at generating large primes, and the algorithms are extremely fast, allowing good response times. The trade off is that the generated Primes are not tested fully to ensure they can act as keys: with this in mind, you will have to generate keys, and try to encrypt and decrypt the same text to ensure that the plain text is retreived again before storing a key. .....