Security in Vehicular Ad Hoc Network (VANET) is one of the major challenging topics and the secure key
interchange between two legitimate vehicles is an important issue. The multi-environment of VANET has
been exploited to extract the secret key and employed security services in VANET. However, it offered more
excellence randomness owed to fading, noise multi-path, and velocity difference. Some of the factors like
Bit-rate, complication and memory requests are reduced by using a process known as quantization. This
paper proposes a new quantization method to extract the secret key for vehicular communications that uses
a lossy quantizer in combination with information reconciliation and privacy amplification. Our work focuses
on the quantization phase for the secret generation procedure. The comprehensive simulations display the
propose method increases the zone and number of the quantization levels to utilize the maximum number
of measurements to reduce reasonably the wasted measurements.