Strongly require Sym. Encrypted Integrity Protected Data Packet
RFC4880 section 5.13 said
5.13 Sym. Encrypted Integrity Protected Data Packet
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It is a new feature created for OpenPGP that addresses the problem of detecting a modification to encrypted data.
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While blanket adoption of this data packet would create interoperability problems, rapid adoption is nevertheless important.
After requiring MDC for nearly 14 years, it's time to remove this wording.