
Terminado
Publicado
Pagado a la entrega
I need help reconstructing logic from a decrypter() function. I need an encrypter() function that can encrypt a plaintext string into a format that can be decrypted using the original decrypter() function. I have attempted to create the encrypter(), but it's not working. This is my understanding of the decrypter(). Its process is a precise, multi-stage pipeline: - Obfuscation & Metadata Extraction: It uses two regular expressions to find and extract metadata "hidden" inside the Base64 string. The first sees the three single-digit offsets for the crypto materials, and the second finds the Base64-encoded cipher mode (e.g., Y2Jj for 'cbc'). - Payload Cleaning: It strips this metadata from the Base64 string to get a clean payload. - Decoding: The cleaned payload is run through base64_decode to get the raw binary data. - Stateful Cryptographic Extraction: This is the most critical and complex step. The decoder loops backwards (from c=2 down to c=0) to extract the salt, then the IV, then the key. Crucially, after it extracts each 16-byte chunk, it shrinks the payload (substr_replace). This means the offset for the IV is applied to a payload that is 16 bytes smaller, and the offset for the key is applied to a payload that is 32 bytes smaller than the original. The special negative offset for the salt -$offset + $pfx is calculated based on the initial binary payload length. - Decompression & Decryption: The final, shrunken payload is decompressed with gzinflate and then decrypted with openssl_decrypt. Using a 16-byte (128-bit) key for a cipher that requires a 32-byte (256-bit) key (aes-256-cbc). It correctly notes that PHP's OpenSSL wrapper silently pads the key with NUL bytes to the required length, a fragile and non-portable behaviour that is the source of instability. Key tasks include: - Understanding how the decrypter() function is working - Reverse engineering to create a working encrypter() function I am providing two files: one containing the original decrypter() function and my attempt at the encrypter(), and the other file is a detailed analysis of the decrypter() function, which may help you better understand it and make it easier to create the encrypter().
ID del proyecto: 39752303
27 propuestas
Proyecto remoto
Activo hace 2 meses
Fija tu plazo y presupuesto
Cobra por tu trabajo
Describe tu propuesta
Es gratis registrarse y presentar ofertas en los trabajos

Hi there I have several years of experience with PHP programming including working OpenSSL I checked attached files and I have found decrypter function Therefore I have ideas what is needed and how it can be completed
£14,70 GBP en 1 día
7,0
7,0
27 freelancers están ofertando un promedio de £22 GBP por este trabajo

Hello Mate!Greetings , Good afternoon! I have gone through your project, Build encrypter() Function, and I am ready to start working as soon as you confirm. I offer best quality and highest performance at a reasonable price, with on-time delivery. I’m well-versed in PHP, Python, CSS, HTML, JavaScript, jQuery, Bootstrap, Angular, AJAX, Laravel, WordPress, Software Development, PHP, Reverse Engineering, Debugging, Software Engineering and Programming. I am checking your attachment, I'll update you shortly... I’d love to discuss the project further to ensure we’re aligned on the scope, timeline, and deliverables. Please let me know a convenient time for us to connect, and I’ll be happy to accommodate. If you have any questions, please let me know
£10 GBP en 1 día
6,1
6,1

I can create a fully functional encrypter() in PHP that mirrors your existing decrypter() pipeline, handling metadata embedding, Base64 encoding, AES-256-CBC encryption with proper key sizing, and gzdeflate compression so the output is fully compatible with your decrypter, preserving offsets, IV, salt, and payload structure for seamless decryption.
£15 GBP en 7 días
5,9
5,9

Building an encrypter function that accurately encrypts a plaintext string requires a deep understanding of the decryption pipeline. With my extensive experience in backend development, specifically PHP, and my prowess in reverse engineering, I am confident in my ability to deliver the encrypter function you need. Not only can I grasp and replicate complex encryption and decryption logic like your decrypter function, but I can ensure excellent performance and compatibility across different browsers and systems - mitigating the instability originating from PHP's pad behavior. Moreover, as a seasoned freelancer, I understand the importance of clear communication and adhering to deadlines. I promise to complete your project efficiently and effectively making sure the final product given is exactly what you need. Let's work together on this challenge so I can help you execute a seamless encryption/decryption process. Feel free to reach out to discuss any specific requirements or queries you may have. Let's get started on this intriguing project!
£15 GBP en 1 día
5,0
5,0

Hello, how are you? I've just read your job description and I am excited to apply for this project. With over 10 years of experience building scalable web applications and a proven ability to bridge the gap between front-end and back-end development, I am confident in my ability to contribute to your project. Front-End Expertise: Proficient in [React.js, React Native, TypeScript, Tailwind CSS, and HTML5], creating intuitive and responsive user interfaces. Back-End Skills: Strong experience with [Node.js, Python/Django, PHP/Laravel/WordPress, etc], and RESTful API development. Database Management: Skilled in [SQL, PostgreSQL, MongoDB] to design and optimize complex data structures. Deployment: Proficient in [AWS, Docker, Kubernetes] for deploying and managing scalable applications. Team Collaboration: Familiar with agile methodologies and tools like Jira, Git, and CI/CD pipelines. I thrive on solving complex challenges and delivering products that exceed expectations. I would love the opportunity to discuss how my experience aligns with your goals. Looking forward to hearing from you soon! Kind regards, Thanks! Angel
£15 GBP en 7 días
4,8
4,8

hello as i am computer engineer and i hav e mster degree in cryptography so i can help you ,thanksnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
£100 GBP en 7 días
4,5
4,5

Hello there, I understand that you are looking for assistance in reconstructing the logic from a decrypter() function to create an encrypter() function that can encrypt a plaintext string for decryption using the original decrypter() function. The decrypter() function involves a precise, multi-stage pipeline including obfuscation, metadata extraction, payload cleaning, decoding, stateful cryptographic extraction, decompression, and decryption. My proposed solution is to carefully analyze the decrypter() function to understand its process and then reverse engineer it to create a working encrypter() function that can produce encrypted data compatible with the decrypter() function. Key Deliverables: - Reverse engineered encrypter() function - Detailed documentation on the logic and process of the encrypter() function - Testing and validation of the encrypter() function I bring expertise in PHP and software development to ensure the successful creation of the encrypter() function. I will share my portfolio with you in the DM for your review. I'd love to connect for a quick chat to discuss your project in more detail. Best regards, Bilal
£15 GBP en 7 días
4,1
4,1

My name is "Usama Safdar" and I am a Ph.D degree holder which means I am highly-capable to tackle this project "Content Editor " with 100 percent accuracy. I am a professional writer with over 6 years of experience in writing; Essays, Research Summaries, Thesis, Dissertation, Lab Reports and Case Studies. I always provide High-Quality Solutions within the shortest possible time with all instructions followed against very reasonable prices. I can manage works even with shortest deadlines like; "2500 words work in just 6 Hours" with very reasonable time. As a pro academic writer I am also familiar with all the referencing styles; such as APA, Harvard, OSCOLA, IEE, MLA etc. I always provide plagiarism-free solutions and as a prove I also provide "FREE Turnitin reports". For Samples, please visit my profile https://www.freelancer.com/u/SolutionMart Please message me to start the discussion. Thank You
£10 GBP en 1 día
3,5
3,5

Hello, I’m Raymundo, fullstack developer with 7 years experience. I’ve worked on several projects where I had to dig into cryptography and data transformation logic, so reconstructing a reliable encrypter from a decrypter is right up my alley. From what you’ve described, I’d approach this by carefully mapping out each stage of the decrypter and then building the encrypter to reverse that pipeline, making sure offsets, padding, and Base64 manipulations align perfectly. I’d test incrementally, starting with the metadata and payload handling, then moving to key/IV insertion, and finally to encryption and verification. I have some questions regarding your project: do you need the encrypter to handle multiple cipher modes, or just the one currently extracted from the Base64 string? Also, are there any constraints on the salt, IV, or key format that I should be aware of? I’m happy to dive in and get this working reliably for you. Looking forward to collaborating on this. Raymundo
£15 GBP en 7 días
1,8
1,8

My name is Rabia Faisal, I am working in the writing industry since 2011. During this time, I have served countless clients with a full amount of satisfaction by providing them with TOP Quality Solutions. I have command of all references APA, Harvard, IEEE, MLA & Chicago, etc. I will provide plagiarism-free work with 100 percent accurate grammar within your given deadline. Please message me to get Top Class Services. I am waiting; https://www.freelancer.com/u/TopWritingGuru
£10 GBP en 1 día
1,5
1,5

Hi There, In today’s digital age, security is one of the most important aspects of any application. I’m offering you a special discount with my professional expertise to **build a custom encrypter() function**, ensuring secure and efficient encryption tailored to your project’s requirements. This won’t just be a simple function — it will be a robust encryption solution designed to handle sensitive data safely. The encrypter() function will be built with industry best practices, ensuring data confidentiality, scalability, and performance optimization while maintaining compatibility with your system’s architecture. Let’s connect to bring your **Build encrypter() Function** project to life with a professional, secure, and future-ready solution. Best regards, Farhan Shabbir
£10 GBP en 1 día
1,0
1,0

EXPERT ((Programming, PHP, Software Development, Software Engineering, Debugging and Reverse Engineering)) DEAR EMPLOYER, I’ve completed the exact same projects before successfully. Awarding me will be the fastest way to complete your task with the best rates possible. I CAN ASSURE YOU 100% THAT WE ARE FULLY CAPABLE OF EXECUTING ANY LEVEL OF TASK/PROJECT BASED ON THE SKILL REQUIRED. I am fully confident about our skills and my understanding of the project description and we are ready to go through any test or sample task you assign to acquire your trust. Let me know when are you available for an initial 15-30-minute discussion (FREE OF CHARGE) so we can discuss the requirement in detail and I can walk you through the mentioned systems to acquire your trust in my skill. REST ASSURED YOUR WORK IS IN VERY SAFE AND PROFESSIONAL HANDS. THANK YOU
£10 GBP en 2 días
0,0
0,0

Hello, As a seasoned professional in the realm of software development and engineering with a demonstrated mastery of PHP programming, cryptocurrency trading and recovery along with an expert-level competence in understanding scripts and reverse-engineering, I am well-suited to tackle your assignment. Your project offers an intriguing challenge to my penchant for detective work and problem-solving. Working collaboratively with you, I will apply my experience matching complex standards based on your 'decrypter()' and translating them into a working 'encrypter()'. My substantial expertise in Debugging, PHP Programming, Reverse Engineering and Software Development aligns perfectly with your project's needs. With a comprehensive understanding of cryptography-based methods, I am confident in deciphering the obfuscation process described in your project description whilst creating a foolproof encrypter function to match its counterpart decrypter. Understanding that the usage of 128-bit key for a cipher that requires 256-bit key can be risky, my attention to detail ensures we will avoid glitches like this. Additionally, as a certified ethical hacker and cyber-security specialist among my other myriad skills, I perceive the value of data security at every level and undertake it relentlessly. This distinctive perspective helps me envision vulnerabilities and hence tailor my coding practices ensuring proprietary information is always safe Thanks!
£20 GBP en 1 día
0,0
0,0

Hi. I am Juan Camilo Rojas. I specialize in Python and PHP development, including cryptography, encryption/decryption routines, and reverse-engineering complex functions. For your project, I can deliver: A full analysis of the existing decrypter() function to ensure complete understanding of offsets, metadata, and extraction logic. A working encrypter() function that produces ciphertext fully compatible with the original decrypter(). Clear handling of Base64 payloads, metadata embedding, and correct key/IV/salt offsets. Documentation explaining how the encryption works, so it can be safely extended or reused. I have experience with stateful cryptographic pipelines, Base64 encoding/decoding, AES modes, and PHP OpenSSL behaviours, and I can reverse engineer and reconstruct complex encryption logic reliably. Best regards, Juan
£30 GBP en 1 día
0,0
0,0

I don’t just fit this project—I can help it reach its full potential. The decrypter() function's intricate multi-stage process involves metadata extraction, payload cleaning, decoding, cryptographic extraction, and decompression for decryption. While I am new to freelancer, I have tons of experience and have done other projects off-site. I would love to chat more about your project! Regards, Saint Sambo
£10 GBP en 30 días
0,0
0,0

We’re here to bring your vision to life with our unique expertise and clear, collaborative communication every step of the way. Our experience includes complex cryptographic processes like those in decrypter(). We'll ensure your encrypter() function seamlessly integrates with the decrypter(), providing a clean, professional solution. While new to freelancer.com, I've successfully tackled similar projects off-site. Let's chat more about your project. Regards, Attie.
£10 GBP en 30 días
0,0
0,0

"I am a perfect fit for your project. Your decrypter() function's detailed logic is understood; from obfuscation to decryption. My experience in reverse engineering will ensure a seamless creation of the encrypter() function. While I am new to Freelancer, I have extensive off-site project experience in this area. I would love to chat more about your project! Regards, Lucca Wiehart"
£10 GBP en 30 días
0,0
0,0

Hey szmegma, I understand the complexity of your decrypter() function and the challenge with creating a working encrypter(). Utilizing my expertise in reverse engineering, cryptography, and PHP development, I can reconstruct the logic from your decrypter() to design a seamless encrypter() that aligns with your requirements. While I am new to freelancer.com, I have tons of experience and have done other projects off site. I would love to chat more about your project! Regards, Johan Labuschagne
£10 GBP en 30 días
0,0
0,0

As an experienced PHP developer, I'm confident I can assist you in reverse engineering and creating a functioning encrypter() function. Through my hands-on experience with the PHP language, I am comfortable navigating through complex code logic like that of your decrypter(). My understanding of key encryption concepts, combined with my problem-solving skills, gives me the ability to comprehend and reconstruct even the most intricate code. I am methodical in my approach which is a crucial characteristic in working on challenging tasks like this. Based on your detailed analysis, I intend to dissect the decrypter(), analyzing the specific intricacies that make it work, such as extracting metadata and employing base64 decoding, among other steps. Then I will generate an encrypter() that mirrors each step, ensuring seamless compatibility with your original decrypter() function. Go Through my Portfolio below https://www.freelancer.com/u/muhammadhassanz2 Click the CHAT button & Let's Start the work! Regards, Hassan S
£30 GBP en 1 día
0,0
0,0

As a PHP expert with a solid background in cryptography and reverse engineering, I am confident in my ability to understand and replicate your decrypter() function, thus enabling me to successfully create a working encrypter() function. My experience extends to handling sophisticated cryptographic functions like those involved in obfuscation, payload cleaning and decoding - all of which are key elements in constructing an effective encryption system. Looking forward to working with you! Best regards, Aniq Ahmed. https://www.freelancer.com/u/Aniqahmed0088
£20 GBP en 1 día
0,0
0,0

birmingham, United Kingdom
Forma de pago verificada
Miembro desde dic 3, 2021
£20-250 GBP
£10-20 GBP
$750-1500 USD
₹1500-12500 INR
$10-30 USD
$500-1000 USD
$30-250 USD
$30-250 USD
₹37500-75000 INR
₹600-1500 INR
₹1500-12500 INR
$1500-3000 USD
$30-250 USD
£250-750 GBP
$2-8 USD /hora
₹750-1250 INR /hora
$10-30 USD
€30-250 EUR
₹750-1250 INR /hora
€8-30 EUR
$30-250 USD
₹1500-12500 INR