Key Transport Protocols Sample Clauses

Key Transport Protocols. A key transport protocol may use either a nonce or a time-stamp in guaranteeing freshness. The protocol may also transport key materials either directly or indirectly. So there are in total four possible combinations. Table 6 describes two direct key transport protocols, while Table 6 the corresponding two indirect key transport protocols. The etc part may contain data known to both Xxxxx and Xxx. Such data may include the participants' names, public keys, public key certi xxxxx, protocol serial number, and so on. It may also contain system control information. Note that one of the purposes of sending tag is for key con rmation, namely for a participant (Xxx) to show the other (Xxxxx) that he does know the new session key. For a less critical application, a time-stamp TS may be transmitted to Xxx in clear to further improve the computational e ciency of the protocols. In addition, if both time-stamps and nonces are available in an application, TS may be substituted with a combination of a time-stamp and a nonce. As can be seen in the tables, protocols that rely on a nonce require one more message move than protocols that rely on a time-stamp. Direct Key Transp Xxxxx xxx Using a Nonce (Protocol DKTUN) Xxx ( N Cb ( N Cb 2R f0; 1g`n key 2R f0; 1g`k x 2R [1;::: ;q 1] (k1; k2) = hash(yx mod p) b c = Ek1 (key) r = KHk2 (key; N Cb; etc) s = x=(r + xa) mod q (k1; k2) = hash((ya gr)s xb mo key = Dk1 (c) Accept key only if KHk2 (key; N Cb; etc) = r d p) ) c; r;s ) verify tag ( tag ( (optional) tag = M XXxxx(N Cb) Direct Key Transport Xxxxx Using a Time-Stamp (Protocol DKTUTS) Xxx key 2R f0; 1g`k x 2R [1;::: ;q 1] (k1; k2) = hash(yx mod p) b Get a current time-stamp TS c = Ek1 (key; T S) r = KHk2 (key; T S; etc) s = x=(r + xa) mod q (k1; k2) = hash((ya gr)s xb mo (key; T S) = Dk1 (c) Accept key only if TS is fresh and KHk2 (key; T S) = r d p) ) c; r;s ) verify tag ( tag ( (optional) tag = M XXxxx(TS)
Sample 1
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