CLASSIFICATION OF ENCRYPTION ALGORITHMS Encryption algorithms can be distinctly

# Classification of encryption algorithms encryption

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CLASSIFICATION OF ENCRYPTION ALGORITHMS Encryption algorithms can be distinctly classified into different classes on the basis of the transformation employed in these and the keys used.Each class of encryption addresses a different security problem. Based on the secret key used cryptographers broadly classify encryption algorithms as symmetric-encryption algorithms and asymmetric encryption algorithms. Symmetric Encryption uses a single key, therefore, it is also known as
single key cryptography or as conventional encryption. In this class of encryption, the receiver and the sender have to agree upon a single secret (shared key. Symmetric encryption process produces unintelligible data (called ciphertext) for a given a message (called plaintext) and the key. The ciphertext is about the same length as the plaintext. In contrast to symmetric encryption, asymmetric Encryption uses two keys, viz., public key and private key. As the name speaks, public key is known to the public, which is used for encryption. The private key is known only to the intended and is used for decryption. Asymmetric encryption is also called as public key cryptography. The public and the private keys are related to each other by any mathematical means. Thus, data encrypted by one public key can be encrypted only by its corresponding private key.A classic example of asymmetric encryption is the RivestShamir-Adleman (RSA) algorithm. This algorithm is block cipher which previously used a key of length of 512 bits. But, it was claimed to be cracked a decade ago. Now, it employs a key of length 1024 bits. Another set of protocols which include keyagreement protocols, identification protocols, commitment schemes and zero- knowledge proofs are only briefly mentioned here and not discussed in detail being beyond the scope of this study. The keyagreement or key- exchange algorithms are used to manage keys through an exchange of messages resulting from private values that are not shared. The Daffier-

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