S/mime pgp

is S/MIME an abstracted system zum general MIME kind encryption, conversely, PGP is more zum email? Why would ich want zu choose one over the other, or kann sein I usage both at die same time?


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Summary: S/MIME and PGP both carry out "secure emailing" however use unique encodings, formats, user tools, and key circulation models.

Du schaust: S/mime pgp

S/MIME builds over MIME und CMS. MIME ist a traditional way von putting arbitrary charme into emails, through a "type" (an clearly indication von what the säule is supposed to mean) und gazillions des encoding rules and other interoperability details. CMS means "Cryptographic post Syntax": it zu sein a binary format weil das encrypting und signing data. CMS counts on X.509 certificates zum public vital distribution. X.509 was designed zu support top-down hierarchical PKI: a small number von "root certification authorities" concern (i.e. Sign) certificates for many customers (or maybe intermediate CA); a user certificate consists of his nennen (in an email context, his e-mails address) und his public key, und is signed über a CA. Someone wanting kommen sie send an email to bob will use Bob"s certificate to get his public vital (needed zu encrypt die email, deshalb that only schuss will be able kommen sie read it); verifying ns signature ~ above Bob"s certificate is a way to make certain that die binding is genuine, i.e. This is really Bob"s windy key, not someone else"s publicly key.

PGP is actually in implementation von the OpenPGP traditional (historically, OpenPGP was defined together a way kommen sie standardize what the pre-existing PGP software did, however there now are other implementations, bei particular ns free opensource GnuPG). OpenPGP specifies its own encryption approaches (similar in functionality zu CMS) und encoding formats, bei particular in encoding layer called "ASCII Armor" which permits binary dünn to take trip unscathed an emails (but you can deshalb mix MIME and OpenPGP). Weil das public vital distribution, OpenPGP depends on Web of Trust: you tun können view that as a decentralized PKI wherein everybody is a potential CA. The oered.org foundation of WoT ist redundancy: you kann trust a public vital because it has actually been signed by many human being (the idea being the if an attacker "cannot stupid everybody weil das a lang time").

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Theoretically, in in enterprise context, WoT does not work well; the X.509 ordered PKI ist more appropriate, due to the fact that it can be made kommen sie match the decisional structure of the envisioned companies, vice versa, WoT counts on employees making their very own oered.org plan decisions.

In practice, although many emailing softwares already implement S/MIME (even Outlook to express has implemented S/MIME weil das about one decade), the certificate enrollment process is complex through interactions with external entities, und requires some hands-on interventions. OpenPGP assistance usually requires including a plugin, yet that plugin comes through all that zu sein needed zu manage keys. Die Web of Trust ist not really used: people austausch their windy keys und ensure binding over one more medium (e.g. Order out ns "key fingerprint" -- a hash value of the crucial -- over the phone). Then civilization keep a copy des the publicly keys des the human being they normally exchange email with (in ns PGP "keyring"), which ensures suitable oered.org and no hassle. When i need to austausch secure emails with customers, ich use PGP the way.

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OpenPGP is so used, together a signature format, weil das other non-email tasks, such as digitally signing software packages in some Linux distribution (at least Debian and Ubuntu execute that).