The maximum number of bytes you can encrypt using RSA depends on the key size and the padding scheme. 1. Key Size The RSA key size determines the maximum size of the plaintext that can be encrypted. The larger the key size (e.g., 1024, 2048, 4096 bits), the larger the block of plaintext that can be encrypted. However, the actual […]
Optimal Asymmetric Encryption Padding (OAEP) is a padding scheme used in RSA encryption to provide additional security by introducing randomness and structure to the plaintext before encryption. Key Features of OAEP Padding Randomness: Incorporates a randomly generated seed to ensure the same plaintext encrypts to different ciphertexts each time, enhancing security. Two-step Masking: Uses a Mask Generation Function (MGF) to […]
RSA Signatures and Endianness RSA signatures are represented as large integers, and the byte order (endianness) determines how the bytes of these integers are stored and transmitted. The two common formats are: Big-endian: The most significant byte (MSB) comes first. This is the traditional format used in network protocols and cryptography. Little-endian: The least significant byte (LSB) comes first. Commonly […]
The difference between PKCS7 (CMS) encryption and RSA encryption lies in their purpose, scope, and how they handle encryption. * Output size differences are described further below. PKCS7 (CMS) Encryption Type: A data format and protocol, not an encryption algorithm itself. Purpose: Used for encrypting data and supporting digital signatures in a standard format. Mechanism: PKCS7 (or CMS, Cryptographic Message […]