Rsa Public Key

1 January 2017

Asymmetric algorithms rely on one key for encryption and a different but related key for decryption. These algorithms have the following important characteristics: β€’ It is computationally infeasible to determine the decryption key given only knowledge of the cryptographic algorithm and the encryption key.

In addition, some algorithms, such as RSA, also exhibit the following characteristics: β€’ Either of the two related keys can be used for encryption, with the other used for decryption. A public key encryption scheme has six ingredients: β€’ Plaintext: This is readable message or data that is fed into the algorithm as input. β€’ Encryption algorithm: The encryption algorithm performs various transformations on the plaintext. β€’ Public and private key: This is a pair of keys that have been selected so that if one is used for encryption, the other is used for decryption.

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The exact transformations performed by the algorithm depend on the public or private key that is provided as input. β€’ Cipher text: This is the scrambled message produced as output. It depends on the plaintext and the key. For a given message, two different keys will produce two different cipher texts. β€’ Decryption algorithm: This algorithm accepts the ciphertext and the matching key and produces the original plaintext.

The essential steps are as the following: . Each user generates a pair of keys to be used for the encryption and decryption of messages. 2. Each user places one of the two keys in a public register or the other accessible file. This is the public key. The companion key is kept private. As figure suggests, each user maintains a collection of public keys obtained from others. 3. If Bob wishes to send a confidential message to Alice, Bob encrypts the message using Alice’s public key.

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