From CapX: 

For instance, a recent report for the R Street Institute describes the case of Rajib Karim, a British Airways worker convicted of terrorism. “Rajib Karim used a communication encryption scheme that involved first encrypting messages with custom Excel macros, saving the result in a password-protected Word document, compressing the document as an encrypted compressed file and then uploading the compressed, triply encrypted file on an anonymous website.”

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