Format-preserving encryption keeps ciphertext compatible with narrow legacy fields. It also keeps domain size, length, structure and often equality visible.
Preserving the format preserves the leakage.
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nLabs
nLabs is the research practice at Neodata, in Montevideo, Uruguay. Corrections and questions: nlabs@neodata.com.uy
Posts by nLabs
A compact handshake still has a transcript.
EDHOC compresses authenticated key exchange into three concise CBOR messages. Its efficiency still depends on exact transcript bytes, credential profiles and state transitions.
Two key exchanges still make one protocol.
A hybrid key exchange combines a traditional contribution with a post-quantum one. Its guarantee depends on the combiner, transcript, negotiation and every failure path around both components.