From DCGKA to Decentralized Secure Group Messaging Sample Clauses

From DCGKA to Decentralized Secure Group Messaging. ‌ Once DCGKA has established a key ratchet for each group member that is shared among the group members, it is straightforward to use this to implement decentralized secure group messaging. Every application message is encrypted using symmetric keys derived from the sender’s key ratchet, like in the two-party Signal protocol and MLS. Here decentralization is no issue because Signal and MLS already allow application messages to be interleaved, or even delivered out-of-order within fixed “epochs”. More formally, when one of the algorithms in Figure 4 returns an update secret I for group member A, the secret I should be used to initialize a protocol for forward-secure authenticated encryption with associated data (FS-AEAD), as defined by Xxxxx, Coretti, and Dodis [1, §4.2]. FS-AEAD allows for symmetric-key message encryption and decryption, like AEAD, but using different deterministically- derived keys for each message, deleting each key after it is used for forward secrecy. The FS-AEAD protocol should be used for application message encryption by A, and for decryption by the other group members, until the next time the DCGKA protocol outputs an update secret for A. The sequence number of A’s last ratchet update should be included in the associated data of these messages, so that recipients know which FS-AEAD protocol state to use for decryption. 8 Performance‌ In this section we examine the performance of our protocol as a function of n, the number of group members.
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