For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.

Public Key Cryptography and RSA topics are: Rabin/Elgamal algorithms, Knapsack/Merkle cryptosystem algorithms and their applications. RSA is a public-key cryptography algorithm that uses a public key to encrypt data and a private key to decrypt it. The acronym stands for Rivest-Shamir-Adleman, the last names of the three MIT inventors who developed the concept in 1977.  Public key cryptography, also known as asymmetric cryptography, uses two different but mathematically linked keys. The public key can be shared with everyone, whereas the private key must be kept secret.  RSA is used in... Show more

Public Key Cryptography and RSA topics are: Rabin/Elgamal algorithms, Knapsack/Merkle cryptosystem algorithms and their applications.

RSA is a public-key cryptography algorithm that uses a public key to encrypt data and a private key to decrypt it. The acronym stands for Rivest-Shamir-Adleman, the last names of the three MIT inventors who developed the concept in 1977. 

Public key cryptography, also known as asymmetric cryptography, uses two different but mathematically linked keys. The public key can be shared with everyone, whereas the private key must be kept secret. 

RSA is used in many applications, including: VPN connections, Encrypting emails, Creating digital signatures, Browsers, Chat applications, Cloud services, P2P systems. 

The RSA public key algorithm is based on the difficulty of the factorization problem.  The factorization problem is to find all prime numbers of a given number, n.

Rabin and ElGamal are asymmetric cryptography algorithms that use two keys for encryption and decryption. 

Rabin's scheme is an older algorithm based on the Integer Factorization Problem (IFP). It has a similar security to RSA. The main feature of this algorithm is the computation asymmetry between the encryption and the decryption. 
The Rabin cryptosystem was invented by Michael Rabin and published in 1979. It works as follows:
Encryption: The public key is used to produce a ciphertext from the plaintext.
Decryption: The private keys are used to decode the ciphertext. 

The Merkle-Hellman knapsack cryptosystem is an asymmetric-key encryption algorithm that uses two keys: a public key and a private key. The algorithm was published in 1978 by Ralph Merkle and Martin Hellman. It is based on the subset sum problem, which is a special case of the knapsack problem.

The algorithm uses two different knapsack problems, one easy and one hard. The easy knapsack is used as the private key, and the public key is used for encryption. 
The cryptosystem is considered insecure due to a polynomial time attack published by Adi Shamir in 1984. It has also been broken by several other attacks, including Adleman and low density attacks. 

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