COMPUTER FUNDAMENTALS

Detailed explanation-1: -It is a value that is known to the sender. The sender inputs the encryption key into the encryption algorithm along with the plaintext in order to compute the ciphertext.

Detailed explanation-2: -A computer encryption key is nothing more than a string of bits where each bit can have a value of either 0 or 1. The number of possible values for a key is simply the total number of values that the key can have. So our one-bit long key can only have two possible values – 0 and 1.

Detailed explanation-3: -The receiver will use a private key (which should be kept secret) in order to decrypt this message when needed. The public key is used to encrypt plain text or to verify a digital signature, whereas the private key is used to decrypt cipher text or to create a digital signature.

Detailed explanation-4: -A public key is a cryptographic key that can be used by any person to encrypt a message so that it can only be decrypted by the intended recipient with their private key. A private key–also known as a secret key–is shared only with key’s initiator.

Detailed explanation-5: -Secret-key cryptography is also called symmetric cryptography because the same key is used to both encrypt and decrypt the data. Well-known secret-key cryptographic algorithms include Advanced Encryption Standard (AES), Triple Data Encryption Standard (3DES), and Rivest Cipher 4 (RC4).