Enhancing Security for Cloud-Based Electronic Health Records through Context-Aware Access Controls

Abinaya Pandiyarajan; Senthil Kumar Jagatheesaperumal; Anits Sherin J; Subriya C

doi:10.2478/ias-2025-0010

.blurhash-client-img { display: none !important; }

Enhancing Security for Cloud-Based Electronic Health Records through Context-Aware Access Controls

Journal of Information Assurance and Security

Volume 20 (2025): Issue 4 (December 2025)

By: Abinaya Pandiyarajan, Senthil Kumar Jagatheesaperumal, Anits Sherin J and Subriya C

Open Access

|Apr 2026

Figures & Tables

Comparison of cryptographic cost across schemes

Encryption time comparison across schemes

File upload computation time for different file sizes

File download computation time for different file sizes

Decryption time comparison across scheme

Comparative Summary of Proposed System vs_ Prior Works

Scheme / Work	Encryption Type	Access Control Mechanism	Revocation Support	Auditability	Latency / Performance	Deployment Readiness
[11]	CP-ABE (Policy-hiding)	Attribute-Based	Limited	No	Not evaluated	Moderate
[17]	ABE + Keyword Search	Fog-assisted Attribute-Based	Partial (fast decryption)	No	Not clearly reported	Limited
[18]	Delegatable ABE	Collaborative Role-Based	Delegation only	No	Moderate	Good
[19]	RS-HABE (Hierarchical)	Hierarchical ABE	Yes	No	High (hierarchical cost)	Strong in cloud-only
Proposed System	CP-ABE + Fernet (Hybrid)	Role + Attribute Based	Yes (with TTP)	Yes	150 ms Reg, 120 ms Login, 200 ms Upload	High (Tested with 500 users)

File Download Computation Time for Different File Sizes

File Size	Computation Time
1MB	3\|G\| + 1\|GT\| + 9.6E
10MB	3\|G\| + 1\|GT\| + 96E
16MB	3\|G\| + 1\|GT\| + 154E
32MB	3\|G\| + 1\|GT\| + 307E
56MB	3\|G\| + 1\|GT\| + 538E
128MB	3\|G\| + 1\|GT\| + 1299E
256MB	3\|G\| + 1\|GT\| + 2458E

Decryption Time for Communication, Computation, and Storage Costs

Entity	Communication Time	Computation Time	Storage Time
Doctor	(256 + 2)\|G\| + \|GT\|	(768 + 3)\|G\| + \|GT\|	(256 + 2)\|G\| + \|GT\|
Patient	(384 + 2)\|G\| + \|GT\|	(512 + 2)\|G\| + \|GT\|	(128 + 1)\|G\| + \|GT\|
TTP	(512 + 2)\|G\| + \|GT\|	(1024 + 4)\|G\| + 2\|GT\|	(512 + 4)\|G\| + 2\|GT\|
Cloud	(128 + 1)\|G\|	(2048 + 5)\|G\| + 2\|GT\|	(1024 + 6)\|G\| + 2\|GT\|

File Upload Computation Time for Different File Sizes

File Size	Computation Time
1MB	6\|G\| + 1\|GT\| + 16E
10MB	6\|G\| + 1\|GT\| + 160E
16MB	6\|G\| + 1\|GT\| + 256E
32MB	6\|G\| + 1\|GT\| + 512E
56MB	6\|G\| + 1\|GT\| + 896E
128MB	6\|G\| + 1\|GT\| + 2048E
256MB	6\|G\| + 1\|GT\| + 4096E

Comparison of cryptographic cost across schemes

Operation	[8]	[9]	[10]	[11]	Our Work
Setup	8.\|G\| + 2.\|GT\|	8.\|G\| + 3.\|GT\|	8.\|G\| + 2.\|GT\|	8.\|G\| + 1.\|GT\|	8.\|G\| + 2.\|GT\|
Key generation	7[G – 1] + [G – 1]	(\|S\| + 3)E₂	(5\|IS\| + 4)E₁ + (2\|IS\| + 1)M	(6\|C\|)TG*	98.\|G\| + 2.\|GT\|
Encryption time	(7m + 3) E14+2E24E_1^4 + 2E_2^4	(10I)TCG + TCTP	(5\|IS\| + 1)E₁ + E₂ + (2\|IS\|)M	(10J)TG^® + TCT^®	6.\|G\| + 2.\|GT\|
Decryption time	(4\|γ\|+1)ρ+\|γ\|E74(4\|\gamma \| + 1)\rho + \|\gamma \|E_7^4	(\|I\| + \|S\| + 2)P + 2\|I\|E₁ + \|I\|S_Dee	(\|I\| + \|S\| + 2)P + 2\|I\|E₁ + \|I\|S_Dee ≤	(TP) + 2 × tTG + 2 × QTP)	11.\|G\| + 2.\|GT\|

Encryption Time Comparison Across Schemes

File Size	[8]	[9]	[10]	[11]	Our Work
1MB	59E14+2E2459E_1^4 + 2E_2^4	(5 + 5I₁)TCG + TCTP	21E₁ + E₂ + 8M	10TG^+TCT	(512 + 4)\|G\| + 2\|GT\|
10MB	451E14+2E24451E_1^4 + 2E_2^4	(5 + 5I₂)TCG + TCTP	61E₁ + E₂ + 24M	25TG^+TCT	(5120 + 4)\|G\| + 2\|GT\|
16MB	703E14+2E24703E_1^4 + 2E_2^4	(5 + 5I₃)TCG + TCTP	91E₁ + E₂ + 36M	35 TG^+TCT	(8192 + 4)\|G\| + 2\|GT\|
32MB	1403E14+2E241403E_1^4 + 2E_2^4	(5 + 5I₄)TCG + TCTP	181E₁ +E₂ + 72M	65 TG^+TCT	(16384 + 4)\|G\| + 2\|GT\|
56MB	2453E14+2E242453E_1^4 + 2E_2^4	(5 + 5I₅)TCG + TCTP	301E₁ +E₂ +120M	105TG^+TCT	(28672 + 4)\|G\| + 2\|GT\|
128MB	5603E14+2E245603E_1^4 + 2E_2^4	(5 + 5I₆)TCG + TCTP	641E₁ + E₂ +256M	230TG^+TCT	(65536 + 4)\|G\| + 2\|GT\|
256MB	11203E14+2E2411203E_1^4 + 2E_2^4	(5 + 5I₇)TCG + TCTP	1281E₁ + E₂ + 512M	455TG^+TCT	(131072 + 4)\|G\| + 2\|GT\|

References

Authors

Metrics

Articles in this issue

DOI: https://doi.org/10.2478/ias-2025-0010 | Journal eISSN: 1554-1029 | Journal ISSN: 1554-1010

Journal RSS Feed

Language: English

Page range: 159 - 179

Published on: Apr 28, 2026

Published by: Cerebration Science Publishing Co., Limited

In partnership with: Paradigm Publishing Services

Publication frequency: 6 issues per year

Keywords:

EHR Security,

Encryption,

Key Management,

Trusted Third Party (TTP),

Access Control,

Privacy

Related subjects:

Computer sciences,

Fundamentals of computer sciences,

Theoretical computer sciences,

IT-security and cryptology

© 2026 Abinaya Pandiyarajan, Senthil Kumar Jagatheesaperumal, Anits Sherin J, Subriya C, published by Cerebration Science Publishing Co., Limited
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License.

Volume 20 (2025): Issue 4 (December 2025)

Entity	Communication Time	Computation Time	Storage Time
Doctor	(256 + 2)\|G\| + \|GT\|	(768 + 3)\|G\| + \|GT\|	(256 + 2)\|G\| + \|GT\|
Patient	(384 + 2)\|G\| + \|GT\|	(512 + 2)\|G\| + \|GT\|	(128 + 1)\|G\| + \|GT\|
TTP	(512 + 2)\|G\| + \|GT\|	(1024 + 4)\|G\| + 2\|GT\|	(512 + 4)\|G\| + 2\|GT\|
Cloud	(128 + 1)\|G\|	(2048 + 5)\|G\| + 2\|GT\|	(1024 + 6)\|G\| + 2\|GT\|

Enhancing Security for Cloud-Based Electronic Health Records through Context-Aware Access Controls

Figures & Tables

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Comparative Summary of Proposed System vs_ Prior Works

File Download Computation Time for Different File Sizes

Decryption Time for Communication, Computation, and Storage Costs

File Upload Computation Time for Different File Sizes

Comparison of cryptographic cost across schemes

Encryption Time Comparison Across Schemes

Paradigm

My account