Security protocols at the transport layer like SSL and TLS establish cryptographic keys at the beginning of every transport layer session. Since numbers of sessions in cognitive networks are large, large numbers of keys are established, thereby increasing the probability of using the same key twice. Key repetitions can be exploited to break the underlying cipher system.
The problem of WEP(Wired Equivalent Privacy) are:
- The use of shared key directly to data encryption.
- Lack of key management.
- · Short keys (40 bits).
- Short IVs (24 bits): results in an inevitable reuse of keys and since they are concatenated unencrypted to the WEP frame, it’s possible to eavesdrop the communication and deduct the shared key.
- Authentication forging
While TKIP (Temporal Key Integrity Protocol) :
extends the current WEP format to use a 48- bit sequence number, but, due to existing implementation constraints, associates the sequence number with the encryption key instead of the MIC key. TKIP mixes the sequence number into the encryption key, and encrypts the MIC and the WEP ICV. This design translates replay attacks into ICV or MIC failures.
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