Cryptography Assignment Help
An overview of cryptographyCryptography basically involves the techniques of encryption and decryption of data. Conventionally, data would be encrypted in a given way and the sender would share the decryption key with the recipient to ensure only they can decode the encrypted information and access the original data. Today, cryptography is still applicable in many fields where sensitive data is used. The only difference is that cryptography today has been highly digitized and most of the encryption and decryption processes are computer-based. The ciphers used are complex computer algorithms that can only be decoded by computers. Even though some experts argue that it is possible to break these ciphers and obtain the hidden data, some of these ciphers are too complex and it is not practically possible to break even with a supercomputer because it would take years and years.
Types of Cryptographic techniques
This is a cryptographic method where both the sender and the receiver share the same key. This single key is used for both encryption and decryption of the data by both the sender and the recipient.
In public-key cryptography, users do have at their disposal a private and a public key. The public key can be shared freely with the public while the private key has to be kept private. The Public key is used for encryption while the private key is used for decryption. Anyone who therefore encrypts information via a particular user’s public key means that information can only be decrypted by the private key of that particular user.
The use of hash functions is not mainly cryptography but it is used to ascertain data integrity. Once the information has been hashed by a given function, any changes in the length of the hash value mean the information has been compromised.
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