Authentication And Ciphering (Security) In GSM Network
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- เผยแพร่เมื่อ 26 ส.ค. 2024
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This lecture explains what are authentication and ciphering procedures in GSM (Global System For Mobiles). Important aspects of the security of GSM network. Authentication is meant to stop the illegal use of the network by unauthorized users. A3 algorithm is used for this purpose. It uses RAND and Ki as its input and generates SRES. Which is then compared with the SRES generated on the network side. If the two match, the authentication is successful. In the second step ciphering or encryption of data between BTS and MS (Mobile Station) starts. Ciphering key Kc is generated using A8 algorithm which uses Ki and RAND as its input. The ciphering key Kc and Frame number is then used by A5 algorithm to encrypt user data in the blocks of 114 bits each.
Thank you :)
so simple,
A very good and simple explanation, thanks a lot.
Explained well👌...Thank you.
Nicely Explained
How does the base station or the network calculate the sres if the authentication key never leaves the sim ?
Hi can you tell me if I want to change the cipher setting from A5/1 to A5/3 due to security reasons then in which device I will found this setting. I know this can be found in BSC nodes but no idea where in BSC nodes. Thanks
Good sir
thank you sir
thank u dr
Thank you for explaining the idea clearly. You keep saying the "network"? By "Network", which component you are referring to here? Is it Authentication Center (AuC) ? Thanks!
By Network, here I mean the VLR as it is the entity that is communicating directly with Mobile, the parameters generated by AuC are then stored in VLR for this purpose.
Thank you Sir. You actually explained this in a later video detailing on this topic. Thanks. Please make some videos on the fundamentals on LTE and WiMAX.
In A3, if Ki is not sent to the BST, then how does BST is able to produce the same SRES as MS?
Ki is saved in the sim card(MS) and HLR of the network
Indians talking in English are very hard for me to understand them :(
Error !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!