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DES
The data encryption standard for encrypting data and using a 56-byte key.
3DES
The triple strength version of the DES cryptographic standard, usually using a 168-byte key.
AES
The advanced encryption standard (AES) is a symmetric key encryption technique, usually using a 128-
byte, 192-byte and 256-byte key which will replace the commonly used DES standard.
NULL Algorithm
The NULL Algorithm provides the convenient connection mode. Can ensure the identity authentication
and privacy without the encryption, and is usually instead of using the ESP (Encapsulating Security
Payload) Protocol.
SHA1 (Secure Hash Algorithm, SHA)
The SHA (Secure Hash Algorithm) family is a set of related cryptographic hash functions and can
calculate the 160-bytes algorithm.
MD5 Algorithm
The MD5 (Message Digest algorithm 5) is a widely-used cryptographic hash function with a 128-byte
hash value.
GRE
The GRE only provide the data packets without monitoring and encryption. Normally, the GRE can
combine the IPsec encryption and provides more secure service to users.
CS-2000 UTM Content Security Gateway User's Manual
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