Posts tagged with 'encryption'

PCPlus 315: Safe online transactions

In which I talk about how to solve the problem of communication between two entities (I talk about the archetypal Alice and Bob) so that no one else (notably, Eve) can listen in, and no one (especially Mallory) can monkey around pretending to be Alice to Bob or vice versa. (For those not in the know why these names were chosen, Alice and Bob just designate A and B, Eve is the eavesdropper and Mallory the man-in-the-middle.) I start off with DES (Data Encryption Standard), an old fashioned encryption...


PCPlus 273: Solitaire cryptography

I write a monthly column for PCPlus, a computer news-views-n-reviews magazine in the UK (actually there are 13 issues a year — there's an Xmas issue as well — so it's a bit more than monthly). The column is called Theory Workshop and appears in the back of every issue. When I signed up, my editor and the magazine were gracious enough to allow me to reprint the articles here after say a year or so. After all, the PDFs do appear on each issue's DVD after a few months. When I...