Boojum is described here.
Essentially it consists of generating a random number, and xoring the secret data with that random number, and then storing both xored data and the random number in different places in memory. When the secret value is required, xoring the two back together recovers it; but the actual secret doesn't appear anywhere in memory.
It goes on to suggest generating a new random number and re-xoring once a second, and trying to ensure that both pieces of data are stored on different chips.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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