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How do I import a raw AES key to a JCEKS keystore?

I have some test data that is encrypted with 256 bit AES. The customer supplied the key as a 256 bit file. The application uses a java key store for decryption keys. The keytool options I've found ...
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data safety in excel

If protecting workbook in ms excel (2010, 2007, 2003) is enough safe for a sensitive data? There is a possibility to choose encryption aes 128 bit in ms excel 2003 and 2007 (as default), from that ...