decryption

Data is encrypted to keep it safe during transmission.

Complete the paragraph about asymmetric encryption.

 .......................................​ (a)   ...................... is encrypted into ..................................​ (b)   ............................ using a ........................................​​ (c)   ...................... . The encrypted data is then transmitted from the sender to the receiver. The encrypted data is then decrypted using a

..................​ (d)   ........................................ .

• plain text
• cipher text
• public key
• . private key ..
• decrypted
• symmetric
• asymmetric

·  Encryption converts plain text into unreadable ​ ​ (a)   .

·  An algorithm and a key are used for encryption and decryption.

·  The same key is needed to both encrypt and decrypt the data.

·  The key can be created using an algorithm.

·  The key must be securely shared with the receiver.

·  If someone else gets the key, they can read the data.

·  ​ (b)   protects information and keeps it private.

• Encryption
• cipher text
• decryption
• plain text
• hash value

Give the purpose of encryption.

 To help keep the ​ (a)  

· To make the data ​ (b)  

• data secure
• meaningless

Symmetric encryption uses a shared key …

… which is used for both —————— and decryption.

Both the sender and receiver must know the key in advance.

If the key is leaked, anyone can decrypt the data.

Asymmetric encryption uses two different keys // a—————— and a———————— .

… The public key is used to encrypt the data, and the private key is used to decrypt it.

… Anyone can know the public key, but only the intended recipient has the private key.

Asymmetric encryption provides better security for communication but is slower than symmetric encryption.

对称性加密

非对称性加密

解密

公钥

私钥

Both the sender and receiver must know the key in advance,which encryption?