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Revisiting Post-Compromise Security Guarantees in Group Messaging
post-compromise security forward secrecy group messaging protocols
2019/5/13
Modern secure messaging protocols such as Signal can offer strong security guarantees, in particular Post-Compromise Security (PCS). The core PCS mechanism in these protocols is inherently pairwise, w...
An updatable encryption scheme allows to periodically rotate the encryption key and move already existing ciphertexts from the old to the new key. These ciphertext updates are done with the help of a ...
In this work we study communication with a party whose secrets have already been compromised. At first sight,
it may seem impossible to provide any type of security in this scenario. However, under s...