diff --git a/draft-ietf-core-oscore-key-limits.md b/draft-ietf-core-oscore-key-limits.md index 8730454..526e6fe 100644 --- a/draft-ietf-core-oscore-key-limits.md +++ b/draft-ietf-core-oscore-key-limits.md @@ -49,6 +49,7 @@ normative: informative: RFC7519: + RFC7959: I-D.irtf-cfrg-aead-limits: entity: @@ -140,6 +141,7 @@ When AEAD_AES_128_CCM_8 is used as AEAD Algorithm for OSCORE, the triplet (q, v, ~~~~~~~~~~~ {: #l-values-as-bytes title="Maximum length of each message (in bytes)" artwork-align="center"} +With regards to the limit for 'l', the recommended 'l' value for the algorithms shown in {{algorithm-limits}}, and for AEAD_AES_128_CCM_8, is 2^10 (16384 bytes) and 2^8 (4096 bytes) respectively. Considering that a typical MTU size is 1500 bytes, and the fact that the maximum block size when using block-wise transfers with CoAP is 1024 bytes (see {{Section 2 of RFC7959}}), it is unlikely that a larger size of 'l' than what is recommended makes sense to use in typical network setups. ## Additional Information in the Security Context # {#context}