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Sep
24
awarded  Autobiographer
Jul
25
awarded  Popular Question
Sep
27
comment Why is CBC with predictable IV considered insecure against CPA
oh no, I meant knowing that a specific block of plain text corresponds to a cipher text. That was clarified by the last edit.
Sep
27
awarded  Student
Sep
27
comment Why is CBC with predictable IV considered insecure against CPA
So, aren't there 2 necessary conditions here ? 1. You are able to predict the next IV ( quite possible reading the BEAST attack with SSL) and 2. You guess the ciphertext block of a previously received message. Is the latter always possible ?
Sep
27
awarded  Supporter
Sep
26
asked Why is CBC with predictable IV considered insecure against CPA