Collaborate Disseminate
I’m not very experienced in the security field, but I’m trying to sign then encrypt a large folder in order to deal with software updates in some machines that will be offline. I’ve thought about generatic a key pair which my… Continue reading Data too large for key size while trying to sign then encrypt
someone can tell me how rijndael works?
for now i need to handle key and iv generated from C# (using rijndael + rfc2898derivebytes) to match with CryptoJS
code snippet of C#:
byte[] saltArray = Encoding.ASCII.GetBytes(“201… Continue reading Why rijndael.key value is different with rijndael.iv?
I like to overwrite my harddisk with random data.
Since /dev/urandom as source is too slow to overwrite a large amount of data in a reasonable time, I’m looking for a good alternative.
These two options meet my speed requir… Continue reading An alternative for /dev/urandom
I have an assignment where I have to print out the hamming weights between every iteration of AES’s diffusion steps and I have been getting a maximum weight on every iteration, but I can’t seem to verify if that is correct or… Continue reading What should the hamming weights be between every iteration of AES?
A ransomware called STOP(DJVU) encrypted my files with AES-556 and used the .kvag extension. After a lot of searching, I tried to use STOPDecrypter many times but it is restricted to a group of extensions and .kvag is one of … Continue reading AES-556 encryption/decryption algorithm [on hold]
By default this system is vulnerable to man in the middle attack. Is there any solution to this without using certificates?
I’m writing an app for a client and part of the client’s encryption requirements for use of AES-256-CBC are:
“128-bit cryptographically random initialization vector”
“PKCS7 padding”
“HMAC of encrypted output required for inte… Continue reading does BouncyCastle implementation of AES-256-CBC meet requirements: "128-bit IV", "PKCS7 padding" and "HMAC verification"
I am a newbie to block cipher and when learning the CBC mode, I start to understand that an IV is being used in this mode and also will be transferred to the message receiver.
So here is my question, what if the IV is tampered? CBC mode … Continue reading What if the attacker tamper the IV used in the block cipher CBC mode?
I have two nodes that need to communicate, A is sending data to B. We just assume that AES-256 key is already shared across the nodes.
The only data being sent from A to B are a few bytes commanding a light bulb:
Light ON:… Continue reading Is safe to use AES-256 to encrypt data with small variations?
i am trying to use AES GCM for decrypting files (small and large files) on Android.
I have tried to do it like this tutorial
https://proandroiddev.com/security-best-practices-symmetric-encryption-with-aes-in-java-7616beaaade9… Continue reading How to save the IV if using AES GCM for big files