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8h
comment suitable method for encryption and decryption
There are a number of related posts on IT Security. For example this one. Check those out.
9h
comment Cache Attacks on Cloud Infrastructures
Presumably it is because the guest vm can, by looking at timing values of writes, tell if a new page was created and the contents copied over.
9h
comment Cache Attacks on Cloud Infrastructures
Also, how is they specifically about Cryptograph and not IT Security?
9h
comment Cache Attacks on Cloud Infrastructures
You should add a link to the source of the statement.
11h
comment Decrypting an encrypted text file
Then there seems to be no way to properly decode unless you do something else upon saving. Otherwise, is a 123 in the cipher text equal to 1 2 3, 12 3, 1 23, or 123? You have no way of knowing, so yes, you have to add a delimiter or always use the same number of characters for each cipher text character (e.g., 001023 would be 1 23).
12h
comment Decrypting an encrypted text file
Is it the case that 3 digit blocks always start with 1?
1d
comment How robust is discrete logarithm in $GF(2^n)$?
@SamuelNeves it looks like you might have two accounts. You can merge them.
1d
comment Standards/RFCs for non-Diffie-Hellman perfect forward secrecy?
Can your "very fast, CCA2-IND asymmetric encryption algorithm" also do digital signatures?
1d
comment Standards/RFCs for non-Diffie-Hellman perfect forward secrecy?
RE Elliptic curve RSA, see this
1d
comment Multiple encryptions of different data with same key all end with same pattern
Can you post the pattern that you are seeing? Is it "=="? It is hard to tell by your comment (please just edit the question), but it looks like you are doing a base64 encoding of the cipher text, which explains why you would see a repeated pattern at the end.
2d
comment Multiple encryptions of different data with same key all end with same pattern
Maybe you are doing a base64 encode after encryption?
Apr
19
comment Proving that a plaintext is the Paillier decryption of a certain ciphertext
Obviously I don't know your exact application domain. But, if Alice knows something about the possible plaintexts (e.g., if it is a voting system, Alice should know approximately how many votes to expect for each candidate due to polling, etc), she should add a random value to the summed ciphertexts. Bob does the decryption, Alice subtracts the random value to get the answer. If Bob tries to cheat, he doesn't know the random value, so, with high probability, alice is left with a random value, which won't match what is expected.
Apr
19
comment Proving that a plaintext is the Paillier decryption of a certain ciphertext
On recovering $r$, see this
Apr
19
comment Proving that a plaintext is the Paillier decryption of a certain ciphertext
this question is also related.
Apr
18
comment Proving that a plaintext is the Paillier decryption of a certain ciphertext
Very related to this question.
Apr
18
comment Proving that a plaintext is the Paillier decryption of a certain ciphertext
Does Bob need to know the answer?
Apr
18
comment Retrieve value of private key after encryption with the public key
This is called circular security. I believe that the answer is not completely understood in the research community.
Apr
17
comment Knowing N and a relationship between the 2 prime numbers(p and q) find p and q generated with RSA
I think you answer is contained here
Apr
17
comment What type of encryption is this?
Sorry, but this type of request is off topic here.
Apr
15
comment Factoring two RSA modulus with known $|p_1 - p_2| < \ell $
@fgrieu that is what I get for not reading the whole question. I mean it is so long...