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# External resources
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[OpenPGP version 6 draft specification ](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/ ) draft-ietf-openpgp-crypto-refresh [2023]
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[RFC4880 ](https://www.rfc-editor.org/rfc/rfc4880.html ) OpenPGP Message Format [2007], specifies OpenPGP version 4
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(wot-resources)=
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## Web of Trust
[PGP Web of Trust: Core Concepts Behind Trusted Communication ](https://www.linux.com/training-tutorials/pgp-web-trust-core-concepts-behind-trusted-communication/ ),
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[PGP Web of Trust: Delegated Trust and Keyservers ](https://www.linuxfoundation.org/blog/pgp-web-of-trust-delegated-trust-and-keyservers/ ) [Konstantin Ryabitsev, 2014]
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[OpenPGP Web of Trust ](https://sequoia-pgp.gitlab.io/sequoia-wot/ ) [Neal Walfield, 2022];
implementation: < https: / / gitlab . com / sequoia-pgp / sequoia-wot / > .
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## GnuPG
[An Advanced Introduction to GnuPG ](https://gnupg.org/ftp/people/neal/an-advanced-introduction-to-gnupg/openpgp/openpgp.pdf ) [Neal Walfield, 2017]
