Android Application for Encrypted Memo

Memo is a very common feature in all kind of cellular phones, be it a high-end smartphone or a very basic feature phone. The task of a memo is to help the users to make a note of their day to day tasks and their personal and sensitive information. The real goal of this application is to secure the sensitive data and avoid others from accessing them. These memos are generally saved in the local memory of the specific devices and are prone to all kinds of security threats when those files are accessed from other sources than the memo application itself. The real goal of this application is to safeguard all the private information of the users and keep them in an encrypted form (Hill Cipher). This application uses substitution algorithms to encrypt the user data as soon as the user saves the memo. The user will be prompted to use a different every time they intend to encrypt their data and the user will have to enter the same to decrypt them as well, and if the user does not enter any key then the encryption phase is skipped altogether. Since the is only known to the user any wrong will yield the wrong decrypted message that will provide wrong information to the infiltrator. Since everyone tends to carry a smartphone with them it is most likely by them that they hastily store their private information in the insecure memo applications leaving them vulnerable to various kinds of threats. Only the person with the correct s will be able to decipher the encrypted memos and access their secure information.