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First chosen-prefix collision for SHA-1:

sha-mbles.github.io/

– The researchers demonstrated an impersonation attack on OpenPGP.
– GnuPG 2.2.18 (released in November 2019) and newer includes a fix (CVE-2019-14855).
– CAcert still uses SHA-1.
– OpenSSL considers disabling SHA-1. Some Linux distributions already configured it more securely.

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