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SHA-1ハッシュアルゴリズムの危殆化対応(SSL証明書)

Last updated at Posted at 2015-01-24

SHA-1ハッシュアルゴリズムの危殆化対応(SSL証明書)

背景

sha-2への移行

既存証明書の署名アルコリズムの確認

  • online check
    Check your certificate installation

Poodle, Heartbleed脆弱性診断、証明書情報、Certificate chain様々なチェックが可能

  • ブラウザ画面から確認
    Certificate Signature Algorithm:

  • SHA1withRSA:対応必要

  • SHA256withRSA:OK

新規SSL証明書CSR作成時の注意事項

opensslでCSR作成する場合、「-sha256」 オプショオンをつけること!
一部の証明書発行機関は無償でsha1証明書からsha2へアップデートのサービスが提供されるが、
無駄な対応工数がかかるので、最初sha2で申請したほうがよい

参考

http://ja.wikipedia.org/wiki/SHA-2
https://jp.globalsign.com/sha256/knowledge/
http://ja.wikipedia.org/wiki/HTTP/2

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