Hierarchal attribute based cryptographic model to handle security services in cloud environment: a new model

International Journal of Electrical and Computer Engineering (IJECE)
Vol. 14, No. 1, February 2024, pp. 1102~1111
ISSN: 2088-8708, DOI: 10.11591/ijece.v14i1.pp1102-1111  1102
Journal homepage: http://ijece.iaescore.com
Hierarchal attribute based cryptographic model to handle
security services in cloud environment: a new model
Banavathu Rajarao1
, Meruva Sreenivasulu2
1
Department of Computer Science and Engineering, Jawaharlal Nehru Technological University Anantapur, Ananthapuramu, India
2
Department of Computer Science and Engineering, K.S.R.M College of Engineering, Affiliated to Jawaharlal Nehru Technological
University Anantapuramu, Ananthapuramu, India
Article Info ABSTRACT
Article history:
Received Dec 9, 2022
Revised Mar 15, 2023
Accepted Apr 7, 2023
The sharing of information in the cloud is a unique element of the
environment, but there is a risk that the information may land with the
wrong people. To counterattack this problem, security-associated
methodologies were used to secure the information that was readily
available to clients. Despite the lack of benefits, this provides
productive/adaptability and dependability in access control strategies
between clients in the sharing of information. The novel hierarchal attribute-
based cryptographic security model (NHACSM) is being proposed to
provide adaptability, versatility, and access control in sharing information in
the appropriate climate. This model allows clients to share information in a
hierarchal way, allowing for a productive assessment of access control
strategy and improved security. The NHACSM method is used to reduce the
total time values for different user instances compared to conventional
approaches, for example, attribute-set-based encryption (ASBE), key-policy
attribute-based encryption (KP-ABE), and ciphertext-policy attribute-based
encryption (CP-ABE). With respect to 10 instances existing methods
achieve 2.7, 2.5, and 2.3 respectively, and also compared to 20, 30, 40, and
50 instances, our proposed method is low. The encryption and decryption
time evaluation values and performance evaluation of different approaches,
ASBE, CP-ABE, were taken into account when increasing the user instance.
Keywords:
Access control policy
Authentication based privacy
Distributed computing
Personal identification based
cryptographic approach
Privacy-based data sharing
Secure model
This is an open access article under the CC BY-SA license.
Corresponding Author:
Banavathu Rajarao
Department of Computer Science and Engineering, Jawaharlal Nehru Technological University Anantapur
Ananthapuramu, 515002, India
Email: b.rajarao1207@gmail.com
1. INTRODUCTION
Distributed computing is a science-based application that provides flexibility and flexibility to meet
customer demands [1]. Through cloud clients, it reduces data owners’ computational costs by using the
cloud’s robust, flexible resources [2]. A cloud service provider (CSP) provides cloud-based services such as
software as a service (SAAS), platform as a service (PAAS), and infrastructure as a service (IAAS) for all
cloud customers [3]. CSP is a cloud security company that helps clients control cloud-based productivity [4].
It saves cloud worker data and executes complex data management procedures to protect it from CSP or
ridiculous [5]. Cloud insurance challenges revolve around data security [6].
Data protection is not a security concern, but good acquired access control is provided [7]. A
portion of therapeutic benefits and other affiliated affiliations must be analyzed to create a plan or address
distinct positions to a social event. System application and product (SAP) is used to access data
comprehensively and work with and isolate data benefits to all bundle clients [8]. Different methods have

Int J Elec & Comp Eng ISSN: 2088-8708 
Hierarchal attribute based cryptographic model to handle security services in cloud … (Banavathu Rajarao)
1103
been used to examine individual customer assignments and pack customer arrangements for cloud data
sharing.
Attribute-based encryption (ABE) is a method of secure verification using symmetric key-based
cryptography [9]. It enables validation-based security saving to cloud clients, using dispersion of key
methodology and supporting only single key correspondence. Yang et al. [10] decentralized confirmation
method does not validate clients’ cloud access, while Zhao and Wang [11] propose a decentralized access
control technique that does not support verified clients, stores records as understandable documents, and does
not allow record composition. All of these approaches have their own merits and drawbacks [12], and it is
important to expand security aspects and empower access control strategy features in distributing information
to all clients in distributed figures.
Helmy et al. [13] suggested a hybrid encryption framework using the Rubik’s cube technique that
merges chaotic encryption, advanced encryption standard (AES), and RC6, thereby yielding permutation-
diffusion encrypted images. Later, orthogonal frequency-division multiplexing (OFDM) transmission showed
improved encryption quality in comparison to classical methods. Zhang [14] presented a hybrid encryption
approach applied to physical layer software control that mitigates the information leakage risk(s). Results
concluded that utilizing the integrating Rivest-Shamir-Adleman (RAS) cryptosystem and block cipher
ensured secure transmission with improved accuracy compared to traditional methods. Agarwal and Joshi
[15] presented a hybrid cryptosystem for merging asymmetric RSA (ARSA) and symmetric DNA encryption
(SDNAE). Further, the present method also addresses authentication, privacy, and efficiency issues, thereby
providing proven sustainability for cloud-based internet of things (IoT) processing.
Novel hierarchal attribute-based cryptographic security model (NHACSM) is a suggested method
for providing adjustable, flexible, and reliable access control for information sharing in conveyed climates.
It allows clients to replace old documents with read-and-write jobs and re-license distributed computing tasks
with updated activity, thus preventing hand-off attacks.
This article examines secure authentication for shared data. This study’s main contribution: i) access
control information should be shared with approved and unapproved clients to ensure secure access to cloud
client boundaries; ii) the design of key management must be decentralized and integrated to ensure that no
two clients can access the same information regardless of whether they agree independently; iii) suggested
using blockchain for data storage and discussing smart computing data security; iv) cloud performance offers
flexible and reliable information to various cloud metrics.
2. IMPLEMENTATION AND CONSTRUCTION OF NHACSM
2.1. Implementation procedure
The implementation procedure is initiated by the trustworthy user’s security parameters connected
to global public key (GPK), followed by key generation, encryption, trap-door generation, and finally the
decryption process. The GPK plays a crucial role in the functioning of the cryptographic system. The key
generation process serves as a foundation for secret key generation for both the data owner (DO) and data
user (DU). The encryption process ensures the secure data format; trap-door generation provides specifically
authorized searches on encrypted data and finally the decryption process. This section describes the
implementation of security in NHACSM with the following calculation methods.
a. The calculating technique is reviewed and organized by a trustworthy user, but only accepts security
parameters connected to GPK.
b. Generation of key: Let us assume as (1).
(𝑎𝑡𝑡𝑟𝑖{𝑢𝑐𝑝𝑘𝑖𝑑,𝑘|𝑘 ∈ ℝ}, {𝐾𝑒𝑦𝑉𝑒𝑟𝑖𝑓𝑘|𝑘 ∈ ℝ}, 𝐴𝑀𝑆𝐾𝑑, 𝐺𝑃𝐾) (1)
AAd outputs secret key SKud of DU and pair corresponding to data owner’s secret key (DO).
c. Encryption of files: GPK is a cloud service provider that encrypts files and transforms them into
CTfog_comm, saving all output as CT1 and CT2.
d. GenTrap: input (𝜔, 𝑆𝐾𝑖𝑑, 𝑃𝐾0) as trap door generator calculation technique is evaluated by DU with
search word 𝜔, secret key 𝑆𝐾𝑢𝑑, and key with public 𝑃𝐾0 then it generates output as Trapdoor (tw) and
key related to re-encryption value 𝑆𝐾𝑢𝑑
𝜔
.
e. The decryption of files is done using cipher text, half-decrypted text, and key retrieval RK to produce
plain text.
2.2. Proposed NHACSM schema
NHACSM is an algorithm implementation technique that uses attribute set-based encryption to
analyze and handle the hierarchical structure of different users. It includes the procedure of domain authority,
subordinate domain authorities, and distinct data users [16]. Figure 1 shows a hierarchical structure

 ISSN: 2088-8708
Int J Elec & Comp Eng, Vol. 14, No. 1, February 2024: 1102-1111
1104
representation of the user, and it has been proposed that the trustworthy user assesses privacy-associated
master key-assisted parameters in the top-level scenario. Domain authority generates and distributes secure
keys to subdomain authorities and next-level users, creating a key structure for each user with a decrypted
key.
Creator Writer Reader
Trustee
KDC Trustee
SK, KX
C {MSG +
Access policy
Ciphertext C
time λ
Signature
SK, KX
SK, KX
C
C
SK, KX
Alice
γ
γ
γ
CLOUD
Figure 1. Hierarchical structure representation of use
We describe the basic properties of NHACSM i.e., it consists of the following methods.
− System_setup: The domain authority calculates PK and MK keys using setup calculation. In (3) bilinear
map connection determines key_structure length, d. Be the prime order p with gen c and evaluate random
parameters 𝛼, 𝛽 ∈ 𝑍𝑝, ∀𝑖(1,2). Then master and public keys are generated based on key d length.
𝑃𝐾 = (𝐶, 𝑐, ℎ1 = 𝑐𝛽1, 𝑓1 = 𝑐
1
𝛽1, ℎ2 = 𝑐𝛽2, 𝑓2 = 𝑐
1
𝛽2, 𝑒(𝑐, 𝑐)𝛼
) (2)
𝑀𝐾 = (𝛽1, 𝛽2, 𝑐𝛼) (3)
− Domain authority creation and grant: Domain authority is organized and related to recursive attribute
relations, i.e., {𝑋0, 𝑋1, . . . . . , 𝑋𝑚}, 𝑋𝑖 = {𝑥𝑖,1, 𝑥𝑖,2, . . . . . , 𝑥𝑖,𝑛} with 𝑎𝑖, 𝑗 and associated attributes. Creates
domain authority keys 𝑟{𝑣}
, pick identity keys for each user 𝑎𝑖,𝑗, 0 ≤ 𝑖 ≤ 𝑚, 1 ≤ 𝑗 ≤ 𝑛𝑖. Domain authority
uses random user identity key selection (4).
𝐷𝐴(𝑀𝐾) =
(
𝐴, 𝐷 = 𝑐
𝑎+𝑟{𝑢}
𝛽1 , 𝐷𝑖,𝑗 = 𝑐𝑟𝑖
(𝑢)
. 𝐻(𝑎𝑖,𝑗)
𝑟𝑗
{𝑢}
,
𝐷𝑖,𝑗 = 𝐶𝑟𝑖,𝑗
𝑢
𝑓𝑜𝑟(0 ≤ 𝑖 ≤ 𝑚, 1 ≤ 𝑗 ≤ 𝑛𝑖),
𝐸𝑖 = 𝑐
𝑟{𝑢}+𝑟
𝑖
{𝑢}
𝛽2 𝑓𝑜𝑟(1 ≤ 𝑖 ≤ 𝑚) )
(4)
In the above domain authority master key generation, Ei is the form of translation unique rule formation
𝑟{𝑢}
relates to attribute set Ai to 𝑟{𝑢}
with associative translating components Ei and Ei’ may be used as
𝐸𝑖/𝐸𝑖 to translator to unique key generations, these details are employed again in calculating method.
DDA++ is a cloud system that verifies every user, generates key structure, and grants to other users using
authorizes derived from domain authority.
− User creation (DAMK, u, ℵ): The DA generates a master key using the key structure, then evaluates the
key structure for the newly produced user ℵ
⃛, which is the combined key set structure of ℵ. Evaluates
user’s secret key using DA master key’s unique identifier sequences.

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(𝑀𝐾𝑖+1) =
(
ℵ
⃛, 𝐷
⃛ = 𝐷. 𝑓𝑖
𝑟
⃛{𝑢}
, 𝐷𝑖,𝑗. 𝑐𝑟
⃛𝑖
(𝑢)
𝐻(𝑎𝑖,𝑗)
𝑟
⃛𝑖,𝑗
{𝑢}
,
𝐷
⃛𝑖,𝑗 = 𝐷𝑖,𝑗
1
. 𝑐
𝑟
⃛𝑖𝑗
{𝑢}
𝑓𝑜𝑟(𝑎𝑖,𝑗 ∈ ℵ
⃛),
𝐸
⃛𝑖 = 𝐸. 𝑓2
𝑟
⃛{𝑢}
+𝑟
⃛𝑖
{𝑢}
𝑓𝑜𝑟(ℵ𝑖 ∈ ℵ) )
(5)
The receiver key is directly taken from a trustworthy user’s 𝑀𝐾𝑖+1, the user structure’s secret key.
− Encryption of file (PK, m, 𝜏): plain message (m), Encrypt to M, the DEK file, and tree access structure.
The 𝜏 encryption computation method (6),
𝐶𝑖𝑝ℎ𝑒𝑟_𝑇𝑒𝑥𝑡(𝐶𝑇) =
(
𝜏, 𝐺
⃛ = 𝑀𝑒(𝑐, 𝑐)𝛼.𝑠
. 𝐺 = ℎ1
𝑠
, 𝐺 = ℎ2
𝑠
, ∀𝑏 ∈ 𝐵:
𝐺𝑏 = 𝑐𝑞(0)
, 𝐺𝑏
′
= 𝐻 (𝑎𝑡𝑡𝑟(𝑏)𝑞(0)
) ,
∀𝑎∈ 𝐴: 𝐺
̂𝑎 = ℎ2
𝑞𝑎
(0)
)
(6)
where 𝜏 and A is the access tree structure and B is the parent node with sub-leaf users.
− Revocation of user: If a cloud user is revoked, they cannot access owner-shared data from any source. We
overcome this problem by re-encrypting shared files read by users of revoked formats. NHACSM extends
attribute set-based encryption to revoke users. Domain authority security privileges generate updated keys
for revoked users if the data owner shares linked-shared files.
− File access operations: User decrypts updated data using 𝐷𝑒𝑐(𝐶𝑇, 𝑆𝐾𝑢) when cloud server makes
encrypted request to user.
− The decryption of files: This calculating technique takes cipher text and key structure as input. The first
decryption operation evaluates user key structure k regarding associative access tree structure and cipher
text content accessed from data owner. If user u’s key structure 𝜏, u and criteria are met, decrypt the entire
material; otherwise, evaluate/perform decryption. Decryption is as (7).
𝐷𝑒𝑐𝑟(𝐶𝑇, 𝑆𝐾𝑢, 𝑖, 𝑡) = 𝑒(𝐷𝑖,𝑗, 𝐺𝑡
′
)/(𝐷𝑖,𝑗
′
, 𝐺𝑡
′
) = 𝑒(𝑐, 𝑐)𝑟𝑖
{𝑢}
. 𝑞𝑡(0) (7)
Decrypting all stored encrypted stuff with translated polynomial interpretation 𝐹𝑧 is as (8).
𝐹𝑧 = 𝑒(𝐺
̂𝑧, 𝐸𝑖/𝐸𝑖)𝐹𝑧
′
= 𝑒(𝑐, 𝑐)𝑟{𝑢}
. 𝑞2(0) (8)
The above decryption algorithm evaluates the message as 𝑀 = 𝐺
̂. 𝐹/𝑒(𝐺, 𝐷)
2.3. Novelty of the proposed work
The novelty of NHACSM relies on amicable handling techniques of hierarchical ABE in sub-
processes such as individual key generation for data owners and distribution mechanism for authorization
process, revocation of users, and encryption and decryption of data for cloud-based data handling. Moreover,
incorporating a hierarchical attribute-based encryption approach enhances the data security, key generation
based on the user’s hierarchy, re-encryption of shared-files after the revocation process, and finally the
decryption. The following section exemplifies the novelty of the proposed work.
a. NHACSM introduces hierarchical attribute-based encryption in cloud environment for analyzing and
managing the hierarchical relationships among users to lever high security. Adoption of such an
encryption technique lubricates flexibility and stiffens access control on the basis of user attributes.
b. The proposed work sketch approach for key generation. The key generation process encompasses
separate secret key generation for data owners and data users including distributors as the authorization
for data access differs depending on the hierarchy of users. Subsequently, secret keys are distributed to
domain authorities, subdomain authorities, and users accordingly.
c. Additionally, NHACSM provides a solution to the user revocation dispute arising in cloud. Once a user’s
access is revoked, re-encryption of shared files also commences. Furthermore, the domain authorities
need to update by generating keys for the revoked users thus ensuring access restriction for the owner
shared data.
d. NHACSM model handles file encryption using access tree structures and encryption computations;
whilst decryption using key structure of users and associated access tree structure.

 ISSN: 2088-8708
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3. EXPERIMENTAL EVALUATION
To test the proposed technique, configure a secure cloud with customers who can access several
documents from diverse cloud data owners [17]. We used property-based encryption to outline NHACSM.
Java and NetBeans build up the latest cloud environment using the latest CloudSim connectors [18] and [19].
Each host has 2.4 Hz, 4-8 GB RAM, and 1 TB storage for this execution. We analyze the following
successions using these prerequisites:
− Setup_NHACSM: It generates public and expert keys for PK and MK presumptions [20].
− NHACSM_keyGen: It implements PK and MK key private chores with key designs. Design depth
supports 1 or 2 support capacities [21].
− NHACSM_keyDeleg: This assigns DA’s private key strategies for new clients based on PK and MK's
space power. Space authority uses a private key [22].
− NHACSM_enc: Based on access tree strategy conditions, creates encoded document utilizing PK.
− NHACSM_Dec: Using private, it decodes the documents.
− NHACSM_rec: PK scrambles all records using private keys and re-encrypts both encoded and decoded
documents. Encode document tasks decode the record using privately created [23].
Test following impacts of conducted technique on time taken by various activities and strategies to
handle [24]. The customer cloud validation time for several cases with the proposed approach. To test the
NHACSM technique using ASBE, KP-ABE, and CP-ABE [25]. The proposed approach produces effective
security reaction time, document encryption, document unscrambling, access tree age time for various
clients, and normal precision with memory usage for client tasks like transfer, demands, and download
demands for proficient and secure information capacity in a distributed climate. Table 1 shows user instance
processing times.
As demonstrated in Table 1 and Figure 2, classic approaches like ASBE and KP-ABE took nearly
identical time to explore user instances on cloud, but when user instances rose, those approaches took longer
to execute user services. The proposed approach took less time than existing approaches. Table 2 shows
encryption times for different user instance requests with safe cloud upload of original material.
Table 1. Total time values for different user instances
Different users CP-ABE KP-ABE ASBE NHACSM
10 5.3 4.9 5.8 3.9
30 7.4 6.10 7.4 5.4
50 8.6 7.6 7.7 5.9
70 9.5 8.4 9.3 6.8
10 10.6 9.5 8.4 7.5
Figure 2. Performance evaluation for cloud setup environment to all the user operations
Table 2 and Figure 3 display the encryption time evaluation values and performance evaluation of
different encryption methods. ASBE and CP-ABE took longer as user instances increased for different
services. The proposed method encrypted user-uploaded files faster.
0
1
2
3
4
5
6
10 20 30 40 50
Time
in
sec
for
different
users
Number of user instances
CP-ABE KP-ABE ASBE NHACSM

1107
Table 2. Encryption time values for different user instances
Different users CP-ABE KP-ABE ASBE NHACSM
10 5.3 4.7 4.6 4.5
20 6.4 5.8 6.3 3.1
30 7.4 7.7 6.3 3.3
40 8.3 7.2 8.2 4.7
50 9.6 8.4 9.4 7.6
Figure 3. Performance evaluation different approaches with encryption time
In secure cloud storage, users who want to receive shared files from data owners evaluate the
decryption time values in Table 3. Table 3 and Figure 4 display the decryption time evaluation values and
performance evaluation of different decryption algorithms. ASBE, KP-ABE, and CP-ABE took longer as
user instances increased for different services. The proposed method decrypted files uploaded by different
instant service users faster. Table 4 and Figure 5 compare memory utilization methods for user instance
services.
Table 3. Description time values
No. of User Instances CP-ABE KP-ABE ASBE NHACSM
10 4.8 5.8 5.3 4.7
20 5.3 6.7 5.9 3.7
30 4.8 8.5 6.4 3.3
40 7.4 6.9 5.7 3.9
50 6.8 7.5 7.9 6.4
Figure 4. Performance evaluation of decryption time of different approaches
0
1
2
3
4
5
6
10 20 30 40 50
Encryption
time
Number of instances by service request
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
10 20 30 40 50
Decryption
Time
CP-ABE
KP-ABE
ASBE
NHACSM

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Table 4. Utilization of memory values in processing user operations in secure cloud storage
Users CP-ABE KP-ABE ASBE NHACSM
100 4,652 3,642 4,887 4,760
200 5,327 4,326 5,226 5,626
300 7,356 6,974 4,745 4,026
400 22,132 5,796 6,354 5,356
500 24,553 8,964 6,785 4,324
ASBE and KP-ABE used plenty of memory when user instance services increased. The proposed
solution uses the least RAM to process user services due to its lower time complexity. Figure 5 compares
access tree structure performance for different user tree constructions to store data securely.
Figure 5. Performance evaluation of memory concerning different approaches
Table 5 displays the average precision of accuracy values of the suggested approach with different
user instance files kept securely in the cloud. Based on the foregoing data, traditional methodologies yield
less accurate results as user instances rise compared to the secure cloud storage solution. Support for Table 5
user instances browsing protected cloud data.
Table 5. Average accuracy values for different user instances
Users CP-ABE KP-ABE ASBE NHACSM
100 4.5 5.9 5.1 3.6
200 5.3 6.6 5.8 4.4
300 4.8 6.3 6.3 3.5
400 7.4 6.8 5.4 4.9
500 6.9 7.2 7.6 5.4
Figure 6 shows users’ accuracy in dispersed data security procedures. Figures 2 to 6 indicate total
user instances, encryption and decryption times, and memory utilization. The suggested method outperforms
ASBE, KP-ABE, and CP-ABE in multi-file sharing cloud systems.
3.1. Validation of the proposed work
The validation of the proposed work is represented in terms of categorizing the users, decrypted
keys to authorize the user, revocation mechanism ensuring the restriction over the shared data, and finally the
enhanced encryption and decryption process in the cloud. Thus, NHACSM adopts a hierarchical attribute-
based encryption model for efficient functioning such as key generation and management techniques, user
revocation, and lastly efficient file encryption and decryption in cloud environment. The following section
depicts the validation of the proposed work in terms of various parameters.
0
5
10
15
20
25
30
10 20 30 40 50
Memory
(bits)

1109
a. Unlike the conventional attribute-based encryption which permits data access on the basis of associated
attributes of either user or data; the hierarchical attribute-based encryption allows data access on the basis
of the hierarchy of users. In the proposed model, the users are categorized under a hierarchical structure
such as individual users, domain authorities, and sub-domain authorities. This categorization brings out
different levels of authority and unique relationships among them. On hierarchical grounds, NHACSM
limits data access by considering the attributes of users as well as the hierarchical position of users. This
aids secure data access in cloud.
b. NHACSM handles key generation and distribution efficiently within the hierarchical structure. As the
roles of domain authorities, and individual users are all well-defined, the key generation process
undergoes severe scrutiny in terms of security parameters by the trusted users. Here, the domain
authorities create a key structure for subdomain authorities and individual users in such a way that every
user has a decrypted key that authorizes or limits data access in a hierarchical structure.
c. The user revocation dispute in cloud is addressed by NHACSM. When a user’s access benefits are
revoked, the model prevents access to owner-shared data by re-encrypting the shared files that were
accessible earlier. The process of generating the updated keys for the revoked users by the authorities of
the domain limits the access of shared files as decryption cannot be proceeded. Thus, the revocation
mechanism adopted in the model increased overall security and restricted the control over shared data in
cloud.
d. NHACSM grants encryption and decryption processes in cloud. The encryption is performed utilizing
access tree structures and encryption computations. On the other hand, secured decryption is carried
forward through key structure of users and the associated access tree structure. The global public key of
cloud service provider aids efficient encryption whilst in decryption the user key structure acts as a
pivotal factor. Additionally, the decryption criteria must be necessarily satisfied by the user.
Figure 6. Performance of accuracy with different user secure operations
4. CONCLUSION
In this report, NHACSM is a secure confirmation approach to give green, adaptable, adaptable client
supply access to distributed computing. It uses an impact hierarchal approach to approach individual
documents, which is available in trademark set-based encryption. NHACSM does not best support client
security and it accomplishes high-level concepts like disavowal purchaser in measurements sharing
presuming more than one venture credit is a present. NHACSM security execution system with explicit
thought-level estimation methodologies. The applied trials showed that green comfort in general execution
assessment can be used to assess well-being efficiencies in distributed computing. Further expansion is
needed to control the organization's keys and examine how they can help team-oriented measurements impart
to cloud servers. The NHACSM method reduces total time values for different user instances compared to
conventional approaches, with ASBE, KP-ABE, CP-ABE, and NHACSM being the lowest for 10, 20, 30, 40,
and 50 instances. ASBE and CP-ABE were taken more time to evaluate different encryption approaches
when increasing the user instance. ASBE, KP-ABE, and CP-ABE took longer to decode when user instances
for different services increased. The proposed approach took less time than existing approaches. Encryption
0
1
2
3
4
5
6
7
8
10 20 30 40 50
Average
precision
for
different
services
Number of rehaned services

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time and performance evaluations. The proposed method encrypted user-uploaded files faster. Decryption
time and performance evaluation of alternative techniques. The proposed method decrypted files uploaded by
different instant service users faster. Memory use performance evaluation for user instance services. Data
security accuracy of scattered users. Memory evaluation using various methods is also effective. Memory
use, total user instances, and encryption and decryption times. The suggested method outperforms ASBE,
KP-ABE, and CP-ABE in multi-file sharing cloud systems. To regulate the company's keys and analyze how
they would support team-oriented loosen-up measures imparting to trusted cloud servers in dispersed
computing.
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BIOGRAPHIES OF AUTHORS
Banavathu Rajarao received a B.Tech. degree in IT from Abdul Kalam Institute
of Technological Sciences, Kothagudem, TS, India. He holds an M.Tech. degree in computer
science and engineering. He is a research scholar at Jawaharlal Nehru Technological
University, Anantapur, Andhra Pradesh, India. His research areas are cloud computing and
IoT. He published various papers in international/national journals and also published book,
book chapters. He had three copyrights. He can be contacted at b.rajarao1207@gmail.com.
Meruva Sreenivasulu received a B.Tech. degree in computer science and
engineering, from K.L. College of Engineering (K. L. University), Vaddeswarm, A.P. India,
in 1990. He completed his M.E. in computer science and engineering, from Jadavpur
University, Calcutta, India, in 1999. He received a Ph.D. in computer science and engineering,
from JNTUA, Anaanthapuramu, in 2013. He has 28 years of teaching experience. He is
currently working as a professor in the Department of Computer Science and Engineering
Department, K.S.R.M. College of Engineering (Autonomous), Kadapa. He is a life member of
ISTE and a member of IE(I). He published 19 papers in international journals and presented
20 papers at national and international conferences. His research interests include data mining,
machine learning, natural language processing, cloud computing, and computer networks. He
can be contacted at mesrinu@rediffmail.com.

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