RSA Excel Encryption Decryption

@sajjadtaghvaeifr

Hello, I trust you're doing well. I am well experienced in machine learning algorithms, with nearly a decade of hands-on practice. My expertise lies in developing various artificial intelligence algorithms, including the one you require, using Matlab, Python, and similar tools. I hold a doctorate from Tohoku University and have a number of publications in the same subject. My portfolio, which showcases my past work, is available for your review. Your project piqued my interest, and I would be delighted to be part of it. Let's connect to discuss in detail. Warm regards. please check my portfolio link: https://www.freelancer.com/u/sajjadtaghvaeifr

@ahmed4499

Hello Sir as i am computer enginerr and i have master degree in cryptography so i can definitely do that for you easily with professional GUI t let you control all parameters you need , so please lets talk , thanks,,

@ducthodg

Hello. I am a cryptography expert. I understand and can do this job best for you! I can complete this project for you within a week! Let's start a chat to discuss the details. Thank you.

@quan9824

Having worked extensively in web development and AI systems, I bring a unique set of skills to the table that make me an ideal candidate for this project. I can seamlessly incorporate RSA algorithm to meet your requirement of encryption and decryption, guaranteed to safeguard every cell's content in your Excel files. In fact, I've already leveraged RSA in several projects like yours, making me well-versed in the encryption/decryption process while maintaining data integrity as you have specified. In terms of my technical stack, I am proficient with Python, which is perfect for building your required desktop utility or command-line script. My experience in handling complex data structures will ensure that not a single byte is lost during any operation on execl file. I understand the significance of receiving timely deliverables and assure you that I can create a working prototype swiftly without compromising on quality. Having gathered extensive experience in my career so far, providing reliable services has become second nature to me Also, I stay updated with new technologies and adapt quickly; thus any ad hoc modifications or upgradations won't be a hinderance. Entrust your project to me and together we'll produce an exceptional deliverable ensuring confidentiality and full protection for your files through RSA under an acceptable time frame.

@vishal1145

Your acceptance criteria reveal a critical design flaw - RSA cannot encrypt large files directly because of its mathematical block size limit. A typical 2048-bit RSA key can only encrypt 245 bytes at a time, and your spreadsheets likely contain thousands of cells. If you try to RSA-encrypt every cell individually, decryption will take 10+ minutes per file and the encrypted output will balloon to 50x the original size. The production-grade approach is hybrid encryption: generate a random AES-256 key to encrypt the entire .xlsx file (fast, handles any file size), then use RSA to encrypt only that AES key (secure key exchange). This is how PGP, SSL, and every enterprise encryption system works. You get military-grade security with sub-second performance. Before I architect the solution, two questions: Do you need the encrypted file to remain in .xlsx format (so Excel can still open it with garbled data), or can the output be a .enc binary that only your tool can decrypt? Are you generating one RSA key pair for yourself, or do you need to distribute public keys to multiple recipients who will encrypt files that only you can decrypt? Here's the technical approach: - C# + WINDOWS FORMS: Build a drag-and-drop desktop app using .NET's built-in RSACryptoServiceProvider and AesCryptoServiceProvider classes - zero external dependencies, runs on any Windows machine without installation. - HYBRID ENCRYPTION: AES-256-CBC encrypts the .xlsx file in memory, RSA-2048 encrypts the AES key and embeds it in the output header. Decryption reverses the process and writes the original file byte-for-byte. - KEY MANAGEMENT: App generates RSA key pairs on first launch and stores them in Windows Certificate Store (encrypted by your login credentials). Export/import functions let you back up keys or share public keys. - ZERO DATA LOSS: The tool never touches Excel's internal structure - it encrypts the raw .xlsx binary, so formulae, pivot tables, macros, and Unicode text survive the round trip perfectly. I've built similar encryption wrappers for 2 healthcare clients who needed HIPAA-compliant file transfers. The prototype takes 3 days: day one for the crypto pipeline and key handling, day two for the UI and error cases (corrupted files, wrong keys), day three for testing against your actual spreadsheets and writing documentation. I don't start until we agree on the encrypted file format and key distribution model - building the wrong architecture wastes both our time. Let's schedule a 15-minute call to lock down the requirements before I write a single line of code.

@Ussama91

I can deliver a reliable and efficient solution to encrypt and decrypt Excel files using the RSA algorithm, ensuring zero data loss for formulae, formatting, and Unicode text. I prefer using Python with libraries like cryptography and openpyxl, and can provide a command-line script or a lightweight desktop utility. I can generate key pairs and provide clear setup and usage instructions, along with source code. I can deliver a working prototype within a short timeframe, adapting to the proposed budget. Waiting for your response in chat! Best Regards.

@Web1devloper

Drawing from my deep expertise in data analytics and a solid 8-year background in C Programming, Excel, and Python, I am well-suited for your RSA Excel Encryption Decryption project. My experience developing end-to-end data solutions will undeniably come to the fore in ensuring absolute security for every cell of your files as they traverse outside your system. With a strong inclination towards data integrity, I guarantee zero data loss for formulae, formatting, and Unicode text during encryption or decryption. Furthermore, my proficiency with Python will prove invaluable when it comes to implementing the RSA algorithm under the preferred language and library of your choice. Rest assured that with me on board, you'll receive not only a reliable product but also comprehensive setup and usage instructions accompanied by all the source code—because your satisfaction is paramount. Lastly, my professional journey has seen me successfully working with businesses across diverse sectors like finance, healthcare, e-commerce, and SaaS—optimizing their operations while ensuring compliance with rigid security protocols. Trust me to deliver an efficient, easy-to-use solution that will guard your spreadsheets with air-tight protection without compromising accessibility or performance.

@Hemantt841

I understand that you need a reliable solution for encrypting and decrypting Excel files using the RSA algorithm, ensuring that every cell is fully protected. The tool must take an ordinary .xlsx file and produce an encrypted version, which can then be decrypted back to its original state using the correct private key, without any data loss or formatting issues. With over 15 years of experience and more than 200

@marcioazambujo

Hi, there. I am interested your project. Because your project is my major, I believe I am a right person for your project. I have experience building secure file-encryption tools on Windows with a strong focus on data integrity and reliability. I can implement a solution that encrypts and decrypts Excel files using the RSA algorithm while preserving formulas, formatting, and Unicode text exactly. The tool can be delivered as a desktop utility, command-line script, or Excel add-in based on your preference. I will include clear key-pair generation, straightforward usage flow, and full source code with documentation. My priority is zero data loss and a smooth, repeatable encryption and decryption process. I hope to hear from you. Thank you

@yogeshjoshi9

Hi, I can build a secure Windows tool that encrypts and decrypts Excel (.xlsx) files using RSA under the hood with a proper hybrid encryption approach (RSA + AES). RSA will securely encrypt a generated AES key, and AES-256 will encrypt the full Excel file to ensure reliability and performance. The tool will take any Excel file and produce an encrypted file that cannot be opened without the matching private key. When decrypted with the correct key, it will restore the spreadsheet exactly as it was — including formulas, formatting, and Unicode text — with zero data loss. I recommend building this as a lightweight Windows desktop utility or command-line tool in Python using the cryptography library, packaged as a standalone .exe. It will include secure key pair generation, clear usage instructions, and full source code. I can deliver a working prototype within 5–7 days. Yogesh

@mindmagic1

Hello, I understand you need a reliable Windows-based solution that encrypts any .xlsx file using RSA and then restores it perfectly — with zero loss of formulas, formatting, or Unicode content. The decrypted file must be identical to the original, and key management needs to be straightforward. From a technical standpoint, the correct approach would be hybrid encryption: use RSA for secure key exchange and AES for encrypting the actual Excel file data. Pure RSA alone isn’t suitable for large files like spreadsheets, but this hybrid model still uses RSA under the hood while ensuring speed and stability. The output would be a fully encrypted file that cannot be opened without the matching private key. I would build this as a lightweight Windows desktop utility or secure command-line tool using Python (.NET is also an option) with well-supported cryptography libraries. It will include key pair generation, encryption/decryption functions, and clear setup documentation along with full source code. I’m confident I can deliver a working prototype quickly and ensure it meets your acceptance criteria without data loss. Best regards,

@jangidkamlesh342

Hi Client, I read your project requirements carefully and understand that you need a secure RSA-based solution to encrypt and decrypt Excel files without any data loss, including formulas, formatting, and Unicode content. I have strong experience in Python, encryption algorithms, and desktop automation, and I can build a reliable tool (desktop utility or script) that securely encrypts and restores Excel files using RSA key pairs. I will ensure the solution is stable, easy to use, and works smoothly on Windows with proper key management. My focus is on security, accuracy, and maintaining complete data integrity. I would like to discuss your preferred interface (desktop app or script) and delivery timeline over chat. I am ready to start immediately and deliver a working prototype quickly. Regards, Kamlesh Kumar

@neriusp

❤️ Hi I am a software developer with strong experience in Windows desktop utilities and applied cryptography (RSA, hybrid encryption, key management) using Python and C#/.NET. ❤️Previous Experience I have built file-encryption tools where preserving binary integrity (formatting, formulas, Unicode text) was critical. The main challenge is that RSA alone isn’t suited for large files, so I implemented secure hybrid encryption (RSA + AES) while keeping RSA as the key mechanism. - Used Python (cryptography / PyCryptodome) to encrypt full binary files safely. - Built C# desktop tools with key-pair generation and PEM import/export. - Ensured decrypted outputs are byte-identical to originals (no data loss). For your case, I propose: • Windows desktop utility (C#) or Python CLI. • RSA key pair generation (2048/4096-bit). • Encrypt entire .xlsx file (binary) so it cannot open without private key. • Decrypt back to an identical spreadsheet. • Clear setup guide + full source code. Prototype delivery: 1~2 days. I am confident I can deliver a reliable, zero-data-loss solution. Available to start immediately. Thank you ❤️

@shuklasaharsh

An MVP (CLI) can be built over Golang with built in crypto support (in Standard Library) including RSA cipher Keys. Proposal: - Golang Standard Library, Cross Compiled for Windows, Linux and MacOS. - Delivered in 4 days.

@shaguftas17

I can build a secure and reliable Excel encryption/decryption tool that fully protects your .xlsx files while preserving all data, formatting, and formulas. Instead of using pure RSA (which is not suitable for large files), I will implement a robust hybrid encryption approach using RSA for key exchange and AES for file encryption, ensuring both security and performance. The solution can be delivered as a lightweight Windows desktop tool or a command-line utility, based on your preference. It will allow easy key pair generation, seamless encryption of Excel files, and accurate decryption back to the original file without any data loss. I will provide clean, well-documented source code along with clear setup and usage instructions. I can deliver a working prototype within 15–20 days and ensure thorough testing for reliability. Looking forward to working with you on this project.

@dewanganpriyansh

With my extensive knowledge and hands-on experience with Excel, I am confident in my ability to deliver a robust and reliable RSA Excel Encryption/Decryption tool tailored exactly to your needs. My five-year track record involves handling vast amounts of sensitive data and ensuring its utmost security. As a result, I've honed my skills not only in working proficiently with Excel but also in upholding stringent data protection practices. Flexibility is at the core of delivering an effective solution, and amenable to your preference, the encryption tool can be developed as an Excel Add-in, lightweight desktop utility, or a command-line script. I will make sure that the RSA algorithm operates seamlessly for both encryption and decryption processes, preserving all necessary components including formulae, formatting, and Unicode text- thereby keeping zero data loss. You can rely on me for delivering a product that is not only functional but well-documented too. I will provide detailed setup and usage instructions along with source code, making it easy for you to understand and apply. Timely delivery is also one of my strong suits; with your deadline in mind, I will ensure that the project is completed efficiently without compromising on quality or security measures. Ultimately, partnering with me means securing your spreadsheets comprehensively while maintaining their full functionality.

@karthikresonite

Hello, Resonite Technologies has 15+ years in secure systems, cryptography integration, and desktop utility development. We can deliver a reliable RSA-based Excel encryption/decryption tool for Windows with zero data loss (formulas, formatting, Unicode fully preserved). ? Recommended Architecture (Secure & Practical) Because RSA alone cannot efficiently encrypt large files, we’ll implement: Hybrid Encryption (Industry Standard) • AES-256 encrypts the entire .xlsx file (binary-safe) • RSA (2048/4096-bit) encrypts the AES key • Final output = Encrypted file + RSA-wrapped key This ensures: ✔ Full spreadsheet protection ✔ No corruption of formulas/formatting ✔ Strong security ✔ Fast performance ? Implementation Options Preferred: Python (cryptography + pycryptodome) Alternative: C# (.NET RSA + AES libraries) Runs as: • Windows desktop utility (GUI) OR • Command-line tool OR • Excel add-in (optional upgrade) ? Key Features ✔ Key pair generation (public/private PEM files) ✔ Encrypt .xlsx → produces protected file ✔ Decrypt with correct private key → identical original file ✔ Unicode-safe ✔ No partial data exposure ✔ Clear setup & usage guide ? Timeline Working prototype: 5–7 days Full polished version with GUI: 10–12 days All source code included. Ready to proceed and confirm preferred interface (CLI or GUI). Regards, Resonite Technologies

@patelmanish836

RSA is an asymmetric algorithm designed to encrypt tiny amounts of data (a few hundred bytes at most). If you try to encrypt an entire .xlsx file cell-by-cell or byte-by-byte using pure RSA, it will be impossibly slow, result in massive file sizes, and likely corrupt the formatting. To achieve "zero data loss" for formulas, formatting, and Unicode, you must encrypt the entire file at the binary level using Hybrid Encryption. Use a blazing-fast symmetric key (like AES-256) to encrypt the Excel file. Use the RSA Public Key to encrypt that specific AES key. Bundle the encrypted AES key and the encrypted file together. I can make you simple python CLI script or excuteble or even full fladge GUI application which can encrypt and decrypt file you want. I have created small demo video file to showcase demo python scrip ping me and i will send it to you.

@basavaiahv

I can definitely make it the best because I am an Betelgeuse final year I know python c++ very well so give me the project