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I like crypto. Need I say more?


Apr
24
comment difference between leveled FHE and normal FHE scheme
@RickyDemer I believe you are right.
Apr
24
comment DES with actual 7 byte key
My suggestion would be to find an open source implementation and modify it to do what you want. Shouldn't be too hard as I think DES ignores the parity bits anyways.
Apr
24
answered difference between leveled FHE and normal FHE scheme
Apr
24
comment Abstract algebra in cryptography
I'd suggest reading an introductory book on crypto then trying to ask more specific questions. As is, the question is to broad.
Apr
24
comment Pairings in Identity-based encryption vs. Attribute-based encryption
Let me explain clearer $aP\neq P^a$. It is just a notational choice by the authors of the papers you are looking at. Some prefer to write things multiplicatively, others choose to write it additively.
Apr
24
comment Pairings in Identity-based encryption vs. Attribute-based encryption
Where did you get these definitions? The only difference is that the first is written additively (which is what it is since it is elliptic curves). The second is written multiplicatively (which some authors use for consistency). They are the same though.
Apr
24
revised Is HMAC necessary if the AES ciphertext of a message includes the CRC of the message?
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Apr
24
revised Is HMAC necessary if the AES ciphertext of a message includes the CRC of the message?
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Apr
24
revised Is HMAC necessary if the AES ciphertext of a message includes the CRC of the message?
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Apr
24
answered Is HMAC necessary if the AES ciphertext of a message includes the CRC of the message?
Apr
23
comment Spurious keys filter
@ceasif good luck with your research. I hope you find this site useful in your research.
Apr
23
answered Spurious keys filter
Apr
23
comment Which homomorphic encryption scheme has the same size of plaintext space and ciphertext space?
@JianLiu so even in the SV scheme, the plaintext space and the ciphertext space have very different sizes.
Apr
23
comment Which homomorphic encryption scheme has the same size of plaintext space and ciphertext space?
@JianLiu, you are right. I am not super familiar with the SV system. Ciphertexts are an integer modulo p. Plaintexts are either a single bit or (if you follow section 6) a binary polynomial of degree $N-1$. So to know how the plaintext and ciphertext spaces compare you need to know how $p$ and $N$ compare. To get an idea of how these compare, look at the table in Section 7. They have (for one instance) $N=2^8$ (since $n=8$ and $N=2^n$) while $p\approx 2^{4096}$ (a 4096 bit prime).
Apr
23
answered Cryptography systems based on NP complete problems
Apr
23
revised Cryptography systems based on NP complete problems
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Apr
23
reviewed Edit key-generation tag wiki
Apr
23
revised key-generation wiki description
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Apr
23
reviewed Approve key-generation tag wiki excerpt
Apr
23
answered Which homomorphic encryption scheme has the same size of plaintext space and ciphertext space?