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May
11
comment How can we find Public key have only 8 or 16bits? How many messages does Eve need to know the Public key in RSA?
a public key is actually two numbers: $(e, N)$. While small $e$ is o.k., small $N$ implies small $d$, the private key. This is very weak.
May
4
comment Is my HMAC secure if I have a complete series of HMAC'd prefix strings
How do you expect to decrypt your "ciphertext"?
May
4
comment Is my HMAC secure if I have a complete series of HMAC'd prefix strings
Please note that MACs are not designed for encryption - they provide message authentication only, and may naturally leak some bits of information about the message.