An encrypted USB drive belonging to Australia's most senior commander in the Middle East went missing last year.

"A report obtained under freedom of information by Fairfax revealed the drive contained Lotus Notes documents of Major-General John Cantwell and was likely stolen during transit through Kuwait," writes SC Magazine's Darren Pauli. "The drive was stored in an aide's backpack - contrary to protocol - and was thought lost when a large amount of luggage went missing for several days from Islamabad airport."

"The Defence Security Authority said the information was likely in the hands of a foreign intelligence service," Pauli writes.

Go to "Secret defence documents lost to foreign intelligence" to read the details.

For regular security news updates, follow eSecurityPlanet on Twitter: @eSecurityP.