# C code for encryption and decryption

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In cryptography, **encryption** is the process of transforming information (referred to as plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key. The result of the process is encrypted information (in cryptography, referred to as ciphertext).

Hill Cipher is a cryptographic algorithm to encrypt and decrypt an alphabetic text. In this cipher, each letter is represented by a number (eg. A = 0, B = 1, **C** = 2). To encrypt a message, each block of n letters (considered as an n-component vector) is multiplied by an invertible n × n matrix, against modulus 26. It's not very secure though, as it uses CipherMode.ECB, but should enough for daily use. -. The VBA **code** below generates the digests for the MD5, SHA1, SHA2-256, SHA2-384, and SHA2-512 hashes; in this case for strings. A. Caesar Cipher **Encryption** **and** **Decryption** in C.Implement Caesar cipher **encryption**-**decryption**.c program for **encryption** **and** **decryption** using caesar cipher.

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Before the modern era, **cryptography** focused on message confidentiality (i.e., **encryption**)—conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for **decryption** of that message).

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