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In-complete question.

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One thing I did not find in this article: is it possible to digitally sign self-modifying program code?

The IBM compatible PC is a modified von Neumann architecture, where stored data can become program instruction, therefore self-modifying code is perfectly legal and is NOT the exclusive domain of malware (viruses).

For example, really expensive commercial software may use self-modifying code together with a hardware dongle device to strongly protect against unathorized duplicate use. Such software vendors may wish to have their programs signed digitally for trustedness, since anti-virus programs have a tendency to heuristically alert on almost any self-modifying code, be it a virus or a false alarm on legitimate program code. One method to prevent such occurances is that many AV software automatically exclude trusted-signed binaries from virus checking. 82.131.210.163 (talk) 17:25, 24 April 2012 (UTC)[reply]

Code Signing on macOS

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Code signing on macOS can easily be defeated as the executable section in question can be stripped.

code signing on Linux

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Our article says "This form of code signing is not used on Linux", but should say that at least some Linux distros (one I'm sure of is Debian) do support digital-signature-based validation of the packages they install. —Steve Summit (talk) 16:35, 9 June 2016 (UTC)[reply]

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How is signing before the expiry enforced?

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One question that isn't really addressed in the article is how the signature on a program is verified to have been made before the expiry of said signature. Mjmouse (talk) 14:36, 9 October 2022 (UTC)[reply]