RFC 8645

Re-keying Mechanisms for Symmetric Keys, August 2019

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S. Smyshlyaev, Ed.

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DOI:  https://doi.org/10.17487/RFC8645

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A certain maximum amount of data can be safely encrypted when encryption is performed under a single key. This amount is called the "key lifetime". This specification describes a variety of methods for increasing the lifetime of symmetric keys. It provides two types of re-keying mechanisms based on hash functions and block ciphers that can be used with modes of operations such as CTR, GCM, CBC, CFB, and OMAC.

This document is a product of the Crypto Forum Research Group (CFRG) in the IRTF.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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