From these, you will see the security of encryption or confidentiality between the transmission of Secret Key encryption method, this will depend on the confidentiality of the non-secret Key algorithm because the algorithm is the one that the ability to master the Secret Encryption Key is not difficult. Therefore, if you use the method, which is confidential. Algorithm, if exposed, would have to create a new algorithm. At the time of use, the secret Key is the Key, if it is disclosed, but create new Key only, which is much easier.
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