Various encryption and decryption algorithms compare __ algorithm

two . Introduction to cryptographic algorithms

Symmetric encryption algorithm

Symmetric encryption algorithm used to encrypt sensitive data and other information, commonly used algorithms include:

DES (encryption Standard): Data Encryption Standard, faster, suitable for encryption of large amounts of data on the occasion.

3DES (Triple des): is based on DES, a piece of data with three different keys for three times encryption, higher strength.

AES (Advanced encryption Standard): Advanced Encryption Standard, is the next generation of encryption algorithm standard, fast, high security level;

Comparison of AES with 3DES

Algorithm name	Algorithm type	Key length	Speed	Decryption Time (construction machine tries 255 keys per second)	Resource consumption
Aes	Symmetric block password	128, 192, 256 bits	High	149 trillion years	Low
3DES	Symmetric Feistel Password	112-bit or 168-bit	Low	4.6 Billion years	In

Non-symmetric algorithm

RSA: Invented by RSA, is a public key algorithm that supports variable-length keys, and the length of the file blocks that need to be encrypted is also variable;

DSA (Digital Signature algorithm): Digital Signature Algorithm, is a standard DSS (digital signature standard);

ECC (Elliptic Curves cryptography): Elliptic curve cipher coding.

ECC has an absolute advantage over RSA in many ways, mainly in the following areas:

Strong attack resistance. The same key length, its resistance to attack is much stronger than many times.

The computation quantity is small, the processing speed is fast. The total ECC speed is much faster than RSA and DSA.

Storage space is small footprint. ECC's key size and system parameters are much smaller than RSA and DSA, meaning that it occupies a much smaller storage space. This is of particular importance to the application of encryption algorithm in IC card.

Low bandwidth requirements. When a long message is decrypted, the three types of cryptographic systems have the same bandwidth requirements, but the ECC bandwidth requirements are much lower when applied to short messages. Low bandwidth requirements make ECC has a wide application prospect in wireless network field.

The following two representations are the security and speed comparisons of RSA and ECC.

Breach time (MIPS year)	Rsa/dsa (key length)	ECC key length	Rsa/ecc key length is greater than
	106		5:1
108	768	132	6:1
1011	1024	160	7:1
1020	2048	21 0	10:1
1078	21000	600	35:1

 

Breach time (MIPS year)	Rsa/dsa (key length)	ECC key length	Rsa/ecc key length than
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