What is a Feistel cipher? While constructing a block cipher, we often use a Feistel cipher. A Feistel cipher is a structure that is used to construct a block cipher. It is named after the cryptographer Horst Feistel. A Feistel cipher is also known as a Feistel...
If the same block of plaintext is encrypted again and again with the same key, it should not produce the same ciphertext block. If it does, then attackers can easily analyze the ciphertext and get information about the plaintext. To address the problem we use block...
AES or Advanced Encryption Standard is a symmetric encryption standard that is established by the US NIST (National Institute of Standards and Technology) in 2001. It is also a block cipher. It divides the input plaintext into several equal-sized blocks and then the...
Bluetooth is often used to exchange data between two devices over a short distance. For example, if we want to transfer a file from one mobile phone to the other, we can do so using Bluetooth. We can use a Bluetooth-enabled headset with a mobile phone and listen to...
When several Bluetooth devices connect with each other, they form an ad hoc network. An ad hoc network is a decentralized network that does not rely on any pre-existing network infrastructure. Each node can forward data to other nodes in the network dynamically...
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