「秘密鍵で暗号化」って言い方にはちょっとした語弊があるという話
「電子署名=『秘密鍵で暗号化』」という良くある誤解の話 #RSA - Qiita
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[ RSAの終わりの始まり - 暗号移行再び #RSA - Qiita ]
https://qiita.com/lemiyachi/items/c20a18b172c6f192a262
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Way back before Free Software, then Open Source were the phenomenon they have become, it was a very different world. Public domain, shareware, home brew computing... software licensing was alien to hobbyests. We relied on vague ownership concepts that didn't even have standing in international law. The #gpl, #free software, later #oss, this was all part of growing up, the result of many iterations of an attempt to control in some ways while sharing in others.
One of the things that really got a hook in me was the idea that software would be used for tyranny, that the people in charge of the software would then be in charge of me. An old friend, 6, quipped that in the future you would need a license to own a compiler. Free software concepts were thus incredibly appealing. I remember when the US government flirted with regulating cryptography domestically. People on Usenet sold "This shirt is a munition" Ts with #RSA code printed. Clipper was a joke.