A list of the advantages and disadvantages of symmetric encryption algorithms

ECB mode

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Encryption in ECB mode

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The decryption of ECB mode

Common in symmetric ciphers are the ECB, CBC, CFB, OFB, and CTR models. Let's take a look at the characteristics of these patterns.

is not used

when

Mode	Name	Advantages	Disadvantages	Note
ECB mode	electronic codebook electronic password This mode	Simple Quick li> Supports parallel computing (encryption, decryption)	is reflected in the ciphertext Can operate on clear text by deleting, replacing ciphertext groupings When decrypting a ciphertext containing some bit errors Cannot withstand replay attacks	Bing uses
CBC mode	cipher Block charning cipher Group link mode	The repeating arrangement of clear text is not reflected in the ciphertext Supports parallel computing (decryption only) To decrypt arbitrary ciphertext groups	When decrypting ciphertext containing certain error bits , all bits of the first grouping and the corresponding bits of the latter group will be faulted Encryption does not support parallel computing	Recommended Use /td>
CFB mode	cipher-feedback ciphertext feedback mode	does not need to be populated (padding) supports parallel computing (decryption only) Can decrypt arbitrary ciphertext groupings	Encryption does not support parallel computing When decrypting ciphertext containing certain error bits, all bits of the first packet and corresponding bits of the latter group will be faulted Cannot withstand replay attacks li>	Now Recommend Ctr mode instead of
OFB mode	output-feedback output feedback mode	does not need to be populated (padding) ready to encrypt and decrypt in advance Encrypt, decrypt using the same structure When decrypting ciphertext containing some error bits, only the corresponding bits in the glyph will be faulted	Does not support parallel operations li> Actively attacking some bits in a ciphertext group, the corresponding bits in the plaintext group are also reversed
CTR Mode	Counter counter Mode	No padding required (padding) Ready to encrypt and decrypt in advance Encrypt, decrypt, use the same structure When decrypting ciphertext containing some error bits, only the corresponding bits in the plaintext will be faulted. Supports parallel computing (encryption, decryption)	When an active attacker reverses some bits in a ciphertext group, the corresponding bits in the plaintext packet are reversed	Recommended Use

First, I want you to figure out what the 3 letters of each pattern are. If you can remember the name of each pattern, you can visualize the corresponding structure in your mind, and you will be able to figure out the characteristics of each pattern.

In the Book of Practical Cryptography [schneier,2003], it is noted that the ECB mode should not be used, whereas CBC mode and CTR mode are recommended. See the book "Practical Cryptography" for details.

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A list of the advantages and disadvantages of symmetric encryption algorithms