Questions On Symmetric Encryption And Decrypt A Message

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2. Symmetric encryption: only a single key is used to both encrypt and decrypt a message.
3. Asymmetric encryption: two distinct keys, one public key and one private key are used for encryption and decryption respectively.
4. Hash functions: takes a message of any size and computes a smaller, fixed-size message called a hash. Hash functions are used to provide better performance when signing large blocks of data using asymmetric encryption, to provide integrity, in authentication protocols, and to create pseudorandom data.
The earlier cryptographic algorithms are broken by computers, which can try millions of combinations each second. As computers become more powerful, the cryptographic algorithms are to be designed stronger to keep data secure. Since single key is used for both encryption and decryption, the symmetric cryptosystem requires transferring a secret key to both communication parties before secure communication can begin. The shared secret key between the communication parties is a problem as a secure confidential channel is required. So, this problem of shared key is removed in public key cryptosystem which led us to focus on the asymmetric cryptosystem and its functionality.
2.4 Cryptographic Techniques
The cryptographic techniques are classified into two types;
2.4.1 Symmetric Key Cryptography
The idea behind symmetric encryption is that only a single key is used to both encrypt and decrypt a message. The benefit to using symmetric encryption is that it’s
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