attacks on authentication Impersonation Replay · Interleaving impersonation involving selective combination of information from one or more previous or simultaneous sessions Reflection an interleaving attack involving sending information from an ongoing authentication session back to the originator8 attacks on authentication • Impersonation • Replay • Interleaving – impersonation involving selective combination of information from one or more previous or simultaneous sessions • Reflection – an interleaving attack involving sending information from an ongoing authentication session back to the originator