Cryptography is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). , It is about constructing and analyzing protocols that overcome the influence of adversaries and which are related to various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation.
There are two types of cryptography. Secret key cryptography is also known as symmetric key cryptography. With this type of cryptography, both the sender and the receiver know the same secret code, called the key. Messages are encrypted by the sender using the key and decrypted by the receiver using the same key. This method works well if you are communicating with only a limited number of people, but it becomes impractical to exchange secret keys with large numbers of people. In addition, there is also the problem of how you communicate the secret key securely.
Public key cryptography, also called asymmetric encryption, uses a pair of keys for encryption and decryption. With public key cryptography, keys work in pairs of matched public and private keys. The public key can be freely distributed without compromising the private key, which must be kept secret by its owner. Because these keys work only as a pair, encryption initiated with the public key can be decrypted only with the corresponding private key.
Strong cryptography or cryptographically strong are general terms applied to cryptographic systems or components that are considered highly resistant to cryptanalysis. Demonstrating the resistance of any cryptographic scheme to attack is a complex matter, requiring extensive testing and reviews, preferably in a public forum. Good algorithms and protocols are required, and good system design and implementation is needed as well. For instance, the operating system on which the crypto