Listing 4. Encrypting only the content in the CardId element
<?xml version='1.0' ?>
<PurchaseOrder>
<Order>
<Item>book</Item>
<Id>123-958-74598</Id>
<Quantity>12</Quantity>
</Order>
<Payment>
<CardId>
<EncryptedData Type='http://www.w3.org/2001/04/xmlenc#Content'
xmlns='http://www.w3.org/2001/04/xmlenc#'>
<CipherData>
<CipherValue>A23B45C564587</CipherValue>
</CipherData>
</EncryptedData></CardId>
<CardName>visa</CardName>
<ValidDate>12-10-2004</ValidDate>
</Payment>
</PurchaseOrder>
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