краткий пересказ. (Cryptography and data encryption) (краткий пересказ. (Cryptography and data encryption).docx)
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Cryptography and data encryption
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What is the difference between cryptography and cryptanalysis?
Cryptography and crypto-analysis are opposite tasks. Cryptography tries to hide information by translating it to ciphertext using secret key. Crypto-analysis tries to decrypt ciphertext without any knowledge about the key.
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How can encryption be used in everyday life?
Encryption is most used among transactions over insecure channels of communication, such as the Internet. It is used to protect data between ATMs, mobile telephones, and many more.
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What does the operation of the cipher depend on?
Cipher has set of well-defined steps that are widely known, the only variable it depends on is an encryption key.
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What are the interrelations of a plaintext and ciphertext?
Plaintext and ciphertext are opposites of each other. Plaintext is an input information for encryption algorithm and output for decryption. Ciphertext are opposite. Ciphertext is used to hide information so nobody from a third party can read it, while the plaintext can be read by anyone.
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What is the main driving force of cryptanalysis?
The driving force of the crypto-analysis is the war. This is because it is very useful to know enemy’s thoughts.