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Nov
5
comment Replaying SSL traffic in an active connection
Well, I am not an expert in this field, but from what I understand of how CBC works, the previous encrypted block is used as the initialization vector when encrypting the next one, so that the two packets giving your friend $100 will actually differ, rendering a replay attack impossible (see for instance: en.wikipedia.org/wiki/File:Cbc_encryption.png). Maybe you are mistaking CBC for ECB?
Nov
5
awarded  Teacher
Nov
5
answered Replaying SSL traffic in an active connection
Nov
5
answered How do you log in from an unsecured computer?