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[AVT] Size of SRTCP authentication tag of AES_CM_128_HMAC_SHA1_32 cipher suite

RFC#4568 is ambiguous regarding the size of the SRTCP authentication tag for the AES_CM_128_HMAC_SHA1_32 cipher suite.  The table in section 6.2 indicates that it should be 80, but section 6.2.2 states: “This crypto-suite is identical to AES_CM_128_HMAC_SHA1_80 except that the authentication tag is 32 bits.”  I did not see anything in RFC#3711 that would indicate that weak authentication tags are not valid for SRTCP -- hence the ambiguity. 

 

Is there consensus on whether the SRTCP authentication tag must always be 80 or whether the table in section 6.2 is in error? 

 

Thanks,

Felix I. Wyss

Interactive Intelligence, Inc.

 

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