{"id":69,"date":"2015-07-27T14:17:52","date_gmt":"2015-07-27T13:17:52","guid":{"rendered":"https:\/\/www.datenzone.de\/blog\/?p=69"},"modified":"2015-07-27T14:17:52","modified_gmt":"2015-07-27T13:17:52","slug":"better-seeded-of-the-openssl-random-number-generator-for-gensafeprime","status":"publish","type":"post","link":"https:\/\/www.datenzone.de\/blog\/2015\/07\/better-seeded-of-the-openssl-random-number-generator-for-gensafeprime\/","title":{"rendered":"Better seeded of the OpenSSL random number generator for gensafeprime"},"content":{"rendered":"<p>Previous releases of <a href=\"https:\/\/github.com\/eriktews\/gensafeprime\">gensafeprime<\/a> up to 1.3 used the OpenSSL library to generate safe prime numbers, but did not add a seed to the OpenSSL PRNG. As a result, it might be possible that these numbers can be guessed. The <a href=\"https:\/\/github.com\/openssl\/openssl\/blob\/bda2fa364d1002d2b5d4d500eb573cd5d9c02207\/doc\/crypto\/BN_generate_prime.pod\">manpage of OpenSSL\u00c2\u00a0BN_generate_prime<\/a> specifies:<\/p>\n<pre>The PRNG must be seeded prior to calling BN_generate_prime(). The prime number generation has a negligible error probability.<\/pre>\n<p>To fix that problem, gensafeprime 1.4 has been released. The release contains a <a href=\"https:\/\/github.com\/eriktews\/gensafeprime\/commit\/5a32aacf8f424176f26f7192b0204f988ce7d8a0\">patch<\/a> that seeds the OpenSSL PRNG from the python os.urandom source of entropy, which should be sufficient for cryptographic applications.<\/p>\n<p>All users of the previous versions are encouraged to update to gensafeprime 1.4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Previous releases of gensafeprime up to 1.3 used the OpenSSL library to generate safe prime numbers, but did not add a seed to the OpenSSL PRNG. As a result, it might be possible that these numbers can be guessed. The &hellip;<\/p>\n<p class=\"read-more\"><a href=\"https:\/\/www.datenzone.de\/blog\/2015\/07\/better-seeded-of-the-openssl-random-number-generator-for-gensafeprime\/\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-69","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/posts\/69","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/comments?post=69"}],"version-history":[{"count":1,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/posts\/69\/revisions"}],"predecessor-version":[{"id":70,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/posts\/69\/revisions\/70"}],"wp:attachment":[{"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/media?parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/categories?post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.datenzone.de\/blog\/wp-json\/wp\/v2\/tags?post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}