Comparison of common encryption algorithms

Symmetric encryption algorithm (identical encryption and decryption keys)

Name	Key Length	Computing speed	Security	Resource Consumption
Des	56	Fast	Low	Medium
3DES	112-bit or 168-bit	Slow	Medium	High
AES	128, 192, 256	Fast	High	Low

 

Asymmetric algorithms (different encryption keys and decryption keys)

Name	Maturity	Security (depends on the key length)	Computing speed	Resource Consumption
RSA	High	High	Slow	High
DSA	High	High	Slow	It can only be used for digital signatures
ECC	Low	High	Fast	Low (low computing workload, low storage space usage, low bandwidth requirements)

 

Hash algorithm comparison

Name	Security	Speed
SHA-1	High	Slow
MD5	Medium	Fast

 

Comparison of symmetric and asymmetric algorithms

Name	Key Management	Security	Speed
Symmetric algorithms	Difficult, not suitable for the Internet, generally used in internal systems	Medium	It is several orders of magnitude faster (Software encryption and decryption speed is at least 100 times faster, and several MB of data can be encrypted and decrypted per second). It is suitable for encryption and decryption of large data volumes.
Asymmetric algorithms	Easy key management	High	Slow, suitable for encryption and decryption of small data volumes or data signature

 

Algorithm selection (combining performance and security)

Symmetric encryption: AES (128-bit ),

Asymmetric encryption: ECC (160-bit) or RSA (1024 ),

Message Digest: MD5

Digital Signature: DSA