Tag Archives: exchange

2015 年的 Turing Award 由 Whitfield Diffie 與 Martin E. Hellman 獲得

從紐約時報看到今年的 Turing Award 由 Whitfield Diffie 與 Martin E. Hellman 獲得:「Cryptography Pioneers Win Turing Award」。在 Turing Award 官網上也可以看到對應的說明。 Diffie–Hellman key exchange 是全世界第一個 (1976 年) 在公開頻道上建立 shared secret 的演算法,直到現在都還廣泛的被使用,可以防禦被動式的監聽攻擊: The Diffie–Hellman key exchange method allows two parties that have no prior … Continue reading

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OpenSSL 的 ECDH 中,224 bits 速度比 160/192 bits 快的原因

跑 openssl speed ecdh 的時候發現很特別的現象: Doing 160 bit ecdh's for 10s: 40865 160-bit ECDH ops in 9.99s Doing 192 bit ecdh's for 10s: 34169 192-bit ECDH ops in 9.99s Doing 224 bit ecdh's for 10s: 60980 224-bit ECDH ops in … Continue reading

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SSL/TLS 的 Perfect Forward Secrecy...

寫這篇順便測試 MathJax 的效果... 因為 NSA 的惡搞,這陣子 PFS (Perfect Forward Secrecy) 突然被拿出來討論: Perfect Forward Secrecy can block the NSA from secure web pages, but no one uses it SSL: Intercepted today, decrypted tomorrow 在講 PFS 前,得先講 Diffie-Hellman key exchange (D-H)。 D-H … Continue reading

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1USD...

Twitter 上看到 jnlin 提到: 28.993 ... murmur.tw/jnlin/5078149 — Jui-Nan Lin (@jnlin) January 3, 2013 這數字看起來跟匯率有關,跑去查 1USD 果然是講這個數字: 突破 29 了啊...

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用 Net::OpenID::Consumer 取得 Google 的帳戶資料

Google 的 OpenID 服務有提供 OpenID Attribute Exchange 1.0 (參考「Federated Login for Google Account Users」這個網頁), 測了一陣子才知道要怎麼透過 Perl 的 Net::OpenID::Consumer 取得資料: my $csr = Net::OpenID::Consumer->new( ua => LWPx::ParanoidAgent->new, args => {}, consumer_secret => 'secret', required_root => 'http://.../', minimum_version => 2 ); my … Continue reading

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