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R.Krishnavenia, Dr.S.Shakila


Cloud computing is the process of utilizing the hardware and software to deliver various services
over the network.Due to the huge development of big data that exists in the cloud servers,
security and privacy are two fundamental factors about cloud technology. Cloud security is a
vital concern for cloud storage services. Cloud data security is the process of protecting the data
stored in the server from unauthorized access. Many researchers carried out their research on
secured data communication in the cloud. But, the data confidentiality was not improved and
encryption time was not minimized. A novel Congruence coefficient Ephemeral Niederreiter
Cryptography-based Secured and Privacy Preserved Data Transmission (CCENC-SPPDT)
technique is introduced for improving data confidentiality in a cloud environment. CCENCSPPDT
technique comprises four processes, namely key generation, authentication, encryption,
and decryption for improving the security and privacy during the patient data transmission in the
cloud. In the CCENC-SPPDT technique, the cloud user (i.e., patient) registers detail to the cloud
server (CS) (i.e., hospital) for performing the secured patient data communication. After
registration, CS generates the ephemeral key pair (i.e., the ephemeral public key and ephemeral
private key) in the key generation step for every registered cloud user. After receiving the
ephemeral key pair, the cloud user encrypts the data with the ephemeral public key and transmits
the encrypted patient data to the cloud server. When a cloud user needs to access the stored
patient data from CS, the cloud user sends a request message to CS. After receiving the request,
CS verifies the cloud user authenticity through the Congruence similarity coefficient with the
dynamic session password. The authorized user allows accessing the data from the cloud server.
Finally, patient data gets decrypted with the ephemeral private key of the cloud user. In this way,
the patient data gets preserved from unauthorized access for improving the security level and
data integrity by using the CCENC-SPPDT technique.Experimental evaluation is carried out onfactors

such as encryption time, data confidentiality rate, and data integrity with respect to a
number of patient data.

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