<code>$encryption-type</code> must be <code>symmetric</code>, as asymmetric encryption is not supported so far.<br/>
<code>$secret-key</code> is the secret key which is used for both encryption and decryption of input data. Its length is fixed and depends on the chosen algorithm: <code>8 bytes for DES</code>, <code>16 bytes for AES</code>.<br/>
<code>$cryptographic-algorithm</code> can must either be <code>DES</code> and or <code>AES</code>. Other algorithms are not supported so far, but, of course, can be added on demand.
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