itwbennett writes: On Tuesday, Yahoo delivered on a promise that it made in October to enable email encryption for everyone by default by January 8. While this is a great step, the company's HTTPS implementation appears to be inconsistent across servers and even technically insecure in some cases, according to Ivan Ristic, director of application security research at security firm Qualys. For example, some of Yahoo's HTTPS email servers use RC4 as the preferred cipher with most clients. 'RC4 is considered weak, which is why we advise that people either don't use it, or if they feel they must, use it as a last resort,' Ristic said.
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