Biblio

Password data in a system usually stored in hash. Various human-caused negligence and system vulnerability can make those data fall in the hand of those who isn't entitled to or even those who have malicious purpose. Attacks which could be done on the hashed password data using GPGPU-based machine are for example: brute-force, dictionary, mask-attack, and word-list. This research explains about effectivity of brute-force and dictionary attack which done on SHA-l hashed password using GPGPU-based machine. Result is showing that brute-force effectively crack more password which has lower set of character, with over 11% of 7 or less characters passwords vs mere 3 % in the dictionary attack counterpart. Whereas dictionary attack is more effective on cracking password which has unsecure character pattern with 5,053 passwords vs 491 on best brute-force attack scenario. Usage of combined attack method (brute-force + dictionary) gives more balanced approach in terms of cracking whether the password is long or secure patterned string.

The biggest challenge of sharing data stored in cloud-storage is privacy-preservation. In this paper, we propose a simple yet effective solution for enforcing the security of private data stored in some cloud storage for sharing. We consider an environment where even if the cloud service provider is not-reliable or is compromised, our data still remain secure. The data Owner encrypts the private files using a secret key, file identifier and hash function and then uploads the cipher text files to the cloud. When a Data user requests access to a file, the owner establishes a key with the user and creates a new key, which is sent to the user. The user can then extract the original key by using the mutually established secret key and use it to decrypt the encrypted file. Thus we propose a system which is computationally simple yet provides a secure mechanism for sharing private data even over an untrusted cloud service provider.

Mobile security is as critical as the PIN number on our ATM card or the lock on our front door. More than our phone itself, the information inside needs safeguarding as well. Not necessarily for scams, but just peace of mind. Android seems to have attracted the most attention from malicious code writers due to its popularity. The flexibility to freely download apps and content has fueled the explosive growth of smart phones and mobile applications but it has also introduced a new risk factor. Malware can mimic popular applications and transfer contacts, photos and documents to unknown destination servers. There is no way to disable the application stores on mobile operating systems. Fortunately for end-users, our smart phones are fundamentally open devices however they can quite easily be hacked. Enterprises now provide business applications on these devices. As a result, confidential business information resides on employee-owned device. Once an employee quits, the mobile operating system wipe-out is not an optimal solution as it will delete both business and personal data. Here we propose H-Secure application for mobile security where one can store their confidential data and files in encrypted form. The encrypted file and encryption key are stored on a web server so that unauthorized person cannot access the data. If user loses the mobile then he can login into web and can delete the file and key to stop further decryption process.