Selection and synchronization method for counter in block cipher counter running mode

A block cipher and operating mode technology, applied in the field of network security, can solve problems such as reducing the security of the counter operating mode, and achieve the effect of improving security and effectiveness and achieving freshness

Active Publication Date: 2011-04-27
CHINA IWNCOMM
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] When using the block cipher counter operation mode for data encryption processing, if the counters used as input packets are the same each time, the encrypted output results through the block cipher algorithm are the same, which greatly reduces the security of the counter operation mode

Method used

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  • Selection and synchronization method for counter in block cipher counter running mode
  • Selection and synchronization method for counter in block cipher counter running mode
  • Selection and synchronization method for counter in block cipher counter running mode

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Embodiment Construction

[0039] The invention provides a method for selecting and synchronizing the counter in the operation mode of the block cipher counter. When the data is transmitted between the OLT and the ONU, the party that actively sends the encrypted data is the sender, and the party that decrypts the received encrypted data For the receiver, the method includes the following steps:

[0040] 1) The sender selects the EPON information to be protected; see figure 2, the EPON information that the sender needs to protect includes the destination address DA field, source address SA field, type / length Type / Len field, data Data field, padding field and check FCS field of the data frame, excluding the preamble Preamble.

[0041] 2) the sender selects a suitable counter, and uses the block cipher counter operating mode encryption step 1) to select the EPON information that needs to be protected; see image 3 , the selected counter consists of three parts: constant, MPCP clock and group counter, whe...

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Abstract

The invention relates to a selection and synchronization method for a counter in a block cipher counter running mode. The method comprises the following steps that: 1) a sender selects protected Ethernet passive optical network (EPON) information; 2) the sender selects a proper counter and encrypts the protected EPON information selected in the step 1) by using the block cipher counter running mode; 3) the sender synchronizes the selected counter and sends the protected information encrypted in the step 2) to a receiver; and 4) after receiving the encrypted protected information from the step3), the receiver synchronizes the counter encrypted and selected by the sender to decrypt the protected information. The invention provides the safe and effective selection and synchronization method for the counter using the block cipher counter running mode, which is suitable for an EPON system.

Description

technical field [0001] The invention belongs to the field of network security, and relates to a method for selecting and synchronizing a counter in a block cipher counter operating mode, in particular to a method for selecting and synchronizing a counter suitable for using the block cipher counter operating mode in an EPON system. Background technique [0002] EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network) is a new type of optical fiber access network technology, which consists of OLT (Optical Line Terminal, Optical Line Terminal), ONU (Optical Network Unit, Optical Network Unit) and POS (Passive Optical Splitter, passive optical splitter), it adopts point-to-multipoint topology, passive optical fiber transmission, provides a variety of services on the Ethernet, and the point-to-multipoint topology uses MPCP (Muti-Point Control Protocol, multi-point control protocol) protocol to control, the protocol mainly includes LLID (Logical link identifier, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06H04L29/06H04Q11/00
Inventor 胡亚楠铁满霞李琴
Owner CHINA IWNCOMM
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