I'm a bit surprised this isn't receiving more attention here. Thus a bit of context for those uncertain whether to click through:<p><i>In this email message to colleagues, Israeli cryptographer Adi Shamir recounts the difficulties he faced in getting a visa to attend the 2013 Cryptologic History Symposium sponsored by the National Security Agency. Adi Shamir is the “S” in the RSA public-key algorithm and is “one of the finest cryptologists in the world today,” according to historian David Kahn.</i><p>Shamir's quoted message is concise and informative and well worth the read.<p>I find this extremely concerning. Science in the Americas continues to be sabotaged by politics. (And it is a further reflection that I had to consider the possible state-generated repercussions of using the word "sabotage" in my comment. (I.e. the keyword count is going high in this post).)<p>Nonetheless, that does appear to be what's happening. Politically, economically. Muzzled speech in the U.S. and in Canada. Etc.