👉 In the context of cryptography, a "bielbrief" refers to a brief message or communication that is encrypted using a bijective function. A bijective function is a mapping from one set (the domain) to another set (the range), and it maps each element in the domain onto exactly one element in the range. In other words, a bielbrief is a type of bijective encryption scheme where the encryption key is used to map the plaintext into ciphertext. The purpose of this process