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Posts by John Graham-Cumming

The oldest trick in the ASCII book

Published on by John Graham-Cumming.

If you're old enough (or interested enough) to have spent a lot of time messing around with the ASCII table then you might have run into a strange fact: it's possible to uppercase ASCII text using just bitwise AND. And it turns out that in some situations this isn't just

End of the road for RC4

Published on by John Graham-Cumming.

Today, we completely disabled the RC4 encryption algorithm for all SSL/TLS connections to CloudFlare sites. It's no longer possible to connect to any site that uses CloudFlare using RC4. Over a year ago, we disabled RC4 for connections for TLS 1.1 and above because there were more secure