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Pastec.io is a very nice API using OpenCV, which can be used for encrypting the image and detecting using android phone's camera.


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You may be interested in Visual cryptography: Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that decryption becomes a mechanical operation that does not require a computer. The method I know relies on using several printed pages to convey the message. Taken ...


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Experimentally, HttpUtility.HtmlAttributeEncode() does NOT replace apostrophes when using .NET framework 3.5 (and older). It does replace them with framework 4.5. So one has to assume that the behaviour changed; this can be seen by comparing the documentation for .NET 3.5: The HtmlAttributeEncode method converts only quotation marks ("), ampersands ...


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In the case of clear-signing, what is signed may not be exactly what you have typed. In order to be robust (RFC4880): lines starting with "-" are prefixed with "<SP>-" (to prevent misinterpretation) line endings, whatever they are, are replaced with <CR><LF> trailing whitespace is ignored In order to fulfill SMTP requirements ...


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TL;DR: this is e-mail legacy. Neither GnuPG, nor Thunderbird, nor probably any other implementations of OpenPGP will bother about the line length. But the whole e-mail infrastructure does. E-Mail Legacy Historically, the limit to 78 characters (RFC 2822) came up because of the usual limitations of characters that fit on a screen per line. This is long ...


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I can not make it simpler than this: Essentially, the trouble happens when Enigmail attaches an inline PGP signature to an email in Thunderbird's HTML message composer. The HTML composer is a different component than the plain-text composer, and it performs some "clean up" on the message body after the user hits send. That is an obvious recipe ...



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