Yahoo has made HTTPS encryption default on its home page and for Web traffic through its data hubs, but a permanent shift in that direction could affect the company's ad business, Danny Yadron writes. For HTTPS to work correctly, advertisers must also agree to use it for their sites -- a challenge for any online publishing company. Most ad networks are on board, but it is more difficult than "flipping a switch," according to Yahoo's chief information security officer, Alex Stamos.

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