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book/source/10-encryption.md
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@ -23,7 +23,7 @@ OpenPGP's encryption mechanisms have evolved over time. The RFC shows an [overvi
Two generations of encryption mechanisms are currently relevant in OpenPGP, and will co-exist for the foreseeable future. The main difference between these lies in the symmetric part of the encryption mechanism, represented by versions 1 and 2 of the *Symmetrically Encrypted and Integrity Protected Data* packets (abbreviated as "SEIPD"). More on these below.
Older, legacy encryption mechanisms exist in OpenPGP. However, those must not be used for encryption anymore. Messages encrypted using these legacy mechanisms may still be decrypted, for more information see the [decryption](decryption_chapter) chapter.
Older, legacy encryption mechanisms exist in OpenPGP. However, those must not be used for encryption anymore. Messages encrypted using these legacy mechanisms may still be decrypted. For more information see the [decryption](decryption_chapter) chapter.
## Symmetric encryption of data, SEIPD
@ -33,7 +33,7 @@ Older, legacy encryption mechanisms exist in OpenPGP. However, those must not be
SEIPD packets are the successor to the [Symmetrically Encrypted Data](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-symmetrically-encrypted-dat) packet, which is obsolete.
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When decrypted, the data contained in a SEIPD packet forms an OpenPGP message. That is, the decrypted data consists of a series of OpenPGP packets.
When decrypted, the data contained in a SEIPD packet forms an [OpenPGP message](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-openpgp-messages). That is, the decrypted data consists of a series of OpenPGP packets.
In both versions of SEIPD, the decryptor has obtained a *session key* in a previous step - before processing the SEIPD packet. Using this session key, the decryptor can decrypt the SEIPD packet and process the contained plaintext data.