PLANET SG-500 - Manual (Page 128)

SG-500 VPN Security Gateway User’s Manual
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„
One of the IPSec standards that provides for the confidentiality of data packets.
DES (Data Encryption Standard):
„ The Data Encryption Standard developed by IBM in 1977 is a 64-bit block encryption block cipher using
a 56-bit key.
Triple-DES (3DES):
„ The DES function performed three times with either two or three cryptographic keys.
AES (Advanced Encryption Standard):
„ An encryption algorithm yet to be decided that will be used to replace the aging DES encryption
algorithm and that the NIST hopes will last for the next 20 to 30 years.
NULL Algorithm:
„ It is a fast and convenient connecting mode to make sure its privacy and authentication without
encryption. NULL Algorithm doesn’t provide any other safety services but a way to substitute ESP
Encryption
SHA-1 (Secure Hash Algorithm-1):
„ A message-digest hash algorithm that takes a message less than 264 bits and produces a 160-bit
digest.
MD5:
„ MD5 is a common message digests algorithm that produces a 128-bit message digest from an arbitrary
length input, developed by Ron Rivest.
GRE/IPSec:
„ The device Select GRE/IPSec ( Generic Routing Encapsulation) packet seal technology.