If we want to encrypt plaintext using a block cipher like AES, we need to ensure that the input bytes are multiple of blocksize in size and they are padded. We can use pad and unpad methods from Crypto.Util.Padding for this purpose. But, if we want to implement PKCS#7...
Using the PyCryptodome module in Python, we can perform AES encryption and decryption very easily. AES is a block cipher. So, the input plaintext is divided into blocks and then padded. We perform encryption operation on the padded plaintext bytes. Similarly, after...
We know that passwords are not encrypted. They are hashed using some cryptographically strong hash functions. (Why don’t we encrypt passwords in a database?) But, if we simply hash a password using a hash function, it will be cryptographically insecure. An attacker...
What is blinding in cryptography? Let’s say Alice has an input message x and Alice wants Bob to compute y = f(x). But, Alice does not want to reveal x or y to Bob. So, Alice encodes the input message x using E and calculates E(x). Alice then sends E(x) to Bob. Bob...
As we know, there are several Python modules using which we can create or verify DSA digital signatures. The pycryptodome module is an example of one such module. Using this module, one can easily create or verify digital signatures using the following piece of code:...
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