The GSM network authenticates the identity of the subscriber through the use of a challenge-response mechanism. A 128-bit Random Number (RAND) is sent to the MS. … If the values do not match, the connection is terminated and an authentication failure is indicated to the MS.
What do you mean by authentication in GSM?
Authentication in the GSM system is achieved by the Base Station sending out a challenge to the mobile station. The MS uses a key stored on its SIM to send back a response that is then verified. This only authenticates the MS, not the user.
Which algorithm is used for authentication in GSM?
GSM uses three different security algorithms called A3, A5, and A8. In practice, A3 and A8 are generally implemented together (known as A3/A8). An A3/A8 algorithm is implemented in Subscriber Identity Module (SIM) cards and in GSM network Authentication Centres.
What are the functions of authentication and encryption in GSM in mobile computing?
GSM encryption is the means by which phone conversations on networks using GSM are scrambled, such that they cannot be descrambled and intercepted by others. Due to their potential uses by terrorist and hostile nations, intelligence agencies in the West are concerned about the dangers inherent in exporting such codes.
What is security service in GSM?
We may therefore say that GSM provides three security services: • temporary identities for the confidentiality of the user identity; • authentication for the corroboration of the identity of the user; • enciphering for the confidentiality of user-related data.
What is A3 authentication?
A3 is used to authenticate the mobile station to the network. A8 is used to generate the session key used by A5 to encrypt the data transmitted between the mobile station and the BTS.
What are the parameters involved in GSM authentication?
The UMTS, like GSM/GPRS, uses the concept of Authentication Vector (AV) but unlike GSM/GPRS, the AV comprises of five components: the random challenge (RAND), the expected response (XRES), key for encryption (CK), integrity key (IK) and the authentication token (AUTN). The VLR/SGSN requests HLR/AuC for authentication.
How are authentication and security maintained in GSM network?
The GSM network authenticates the identity of the subscriber through the use of a challenge-response mechanism. A 128-bit Random Number (RAND) is sent to the MS. … Upon receiving the SRES from the subscriber, the GSM network repeats the calculation to verify the identity of the subscriber.
What is security algorithm?
Five popular security algorithms are Hash Message Authentication Code (HMAC) Message Digest version (MD5) and HMAC Secure Hash Algorithm (SHA) for authentication, and Data Encryption Standard (DES), DES-Cipher Block Chaining (CBC), and Triple DES (3DES) for encryption. … HMAC is a secret-key algorithm.
What is mutual authentication in network security?
Mutual authentication is when two sides of a communications channel verify each other’s identity, instead of only one side verifying the other. … For example, a client and a server using mutual authentication take steps to independently verify each other’s identity, instead of only the client authenticating the server.
What is call routing in GSM?
In a mobile system the endpoints of the connection may not be fixed. A GSM subscriber may roam nationally as well as internationally. The VLR allocates a MSRN from an associated pool to the call and creates a binding between the called subscribers IMSI and the MSRN. …
Which are the different authentication methods explain any one in detail?
Multi-Factor Authentication (MFA) is an authentication method that requires two or more independent ways to identify a user. Examples include codes generated from the user’s smartphone, Captcha tests, fingerprints, voice biometrics or facial recognition.
What are the input and output of the GSM authentication function A3?
A3 and A8 use COMP128 which is a keyed hash function.It takes 128 bit key and 128 bit RAND number as input and produces 128 bit output. The first 32 bits of 128 bit form SRES i.e. Signed response and next 54 bits forms the cipher key which is used for authentication and encryption.
How many types of security services are provided by GSM?
Three algorithms have been specified to provide security services in GSM. Algorithm A3 is used for authentication, A5 for encryption, and A8 for the generation of a cipher key.
What is authentication in computer science?
Verifying the identity of a user, process, or device, often as a prerequisite to allowing access to resources in an information system.
How do you maintain security of a system?
You can control and monitor system access by doing the following:
- Maintaining physical site security.
- Maintaining login control.
- Restricting access to data in files.
- Maintaining network control.
- Monitoring system usage.
- Setting the path variable correctly.
- Securing files.
- Installing a firewall.