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Cryptography studies secure communication techniques that only allow the sender and the receiver to view the message by using a secret key.
Cryptography applications involve digital signatures or authentication, electronic or digital money, SIM card authentication, encrypting devices, sensitive emails, protecting confidential data, securing websites, WhatsApp encryption, etc.
In the coming years, encryption will go mainstream, if it has not already, and blockchains will be used more prominently for data storage, in which case hacking the system is close to impossible due to its decentralized nature.
