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Jun
29
comment Ideas for non duplicate cryptographically secure numbers
Use a cryptographically secure random number generator and generate 128-bit random numbers.
Jun
29
comment ElGamal scheme attack when one message is known and ciphertexts are intercepted
Why should I help someone named cryptohater? :)
Jun
29
comment Double the key in block cipher - which approach is better?
Are you sure $m$ is not known to the attacker? Typically for a key-recovery attack, we assume it is. Also, if it isn't, both $E_1'$ and $E_2'$ are equivalent to the one-time pad (assuming the keys are properly chosen), which is impossible to break, even for a computationally unbounded adversary.
Jun
29
comment Double the key in block cipher - which approach is better?
How much storage space does the attacker have?
Jun
29
comment Double the key in block cipher - which approach is better?
Is $m$ a single block? Is $m$ known to the attacker?
Jun
29
comment Double the key in block cipher - which approach is better?
Like I said on your other question, what have you tried? Where are you stuck? This isn't a question answering service.
Jun
29
comment Extracting a WinRAR password
Let's continue this discussion in chat.
Jun
29
comment Extracting a WinRAR password
What is the password encrypting? xyz file, rar file, other file?
Jun
29
comment Extracting a WinRAR password
I'm confused. Is the winrar file encrypted or is the file encrypted and then stuck in an unencrypted winrar file?
Jun
29
revised Extracting a WinRAR password
deleted 4 characters in body
Jun
27
comment Getting the encryption/has algorithm used for modem configuration file
@chaosmind I contacted the Stackexchange security team. They'll have to handle this one as site moderators cannot fix this.
Jun
25
revised AES and Homomorphic Encryption
deleted 4 characters in body
Jun
25
comment AES and Homomorphic Encryption
@Dillinur would it? You would have to then split the homomorphically encrypted string on the commas, convert the ASCII representations of integers into usable integers. I'm not convinced that all that is as easy as you are implying. Remember, equality tests can't be done without interaction.
Jun
25
revised AES and Homomorphic Encryption
added 301 characters in body
Jun
25
comment AES and Homomorphic Encryption
@Dillinur I don't think I am missing the point at all. Your comment relates to one minor sentence at the end of my answer. The rest of my answer is exactly what you say. Also, I disagree that with your assertion that "no trick is needed". If I take a long string of integers separated by commas and encrypt it directly with AES-CBC it is going to be very hard for the cloud to do very useful operations with that.
Jun
25
comment Why is the public/private key length used in libsodium so much shorter than needed for RSA
They likely aren't using RSA. Likely some sort of elliptic curve cipher.
Jun
25
answered AES and Homomorphic Encryption
Jun
24
comment Which symmetric cipher is best for studying?
P.S., Welcome to our site. I hope you find it very useful.
Jun
24
comment Which symmetric cipher is best for studying?
After reading this comment where you said "80 years" I was thinking, "man, dutch grammar school is insane" :)
Jun
24
comment cipher text only attacks on deterministic homomorphic encryption schemes
If they have the public key, why not just use it to encrypt 1?