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seen Mar 6 '13 at 22:22

Mar
6
comment Is this encryption algorithm build from MD5 secure?
I don't understand how it would not provide authenticity since it would be difficult to generate a meaningful message without the secret. It seems to me that one should be able to state that a message is almost certainly created by someone who had the secret. Although, 'authenticity' may have a more strict definition in this field than how I understand it.
Mar
6
comment Is this encryption algorithm build from MD5 secure?
The subsequent blocks are encrypted like this: $C_n = M_n \oplus MD5(secret || C_{n-1} )$ . I'll update the question to make that more clear.