Mohsin Afzal 31-Aug-15 3:56 31-Aug-15 3:56 Hello All I am A Software Programmer, This is My 4th Custom Windows Application, But For This application I am USing an Activation Key to Activate this software, i am using SQL Server Database, this is i can do with Encryption and Decryption but the problem is Piracy, i want to Save my Application to get Pirated, can you help me to save my Application, I want that this application run only one Company if they copy exe to other company then it will not run. How i can do this Please Help me. The poem in patch adams by walt whitman. Waiting Your Responce. Terapia doktora gersona ebook store download. Openssl rsa: Manage RSA private keys (includes generating a public key from it). Openssl rsautl: Encrypt and decrypt files with RSA keys. If you want to decrypt a file encrypted with this setup, use the following command with your. When decrypting an archive, we need to decrypt the encrypted AES key using the RSA private key blob stored in 00000000.dky. The sample decryption only works because the sample files are encrypted and decrypted with a key that is stored locally. Sadly this means that the sample. Encryption is the process of encoding files in such a way that only those who are authorized can access it. Mankind is using encryption from ages even when computers were not in existence. During war they would pass some kind of message that only their tribe or those who are concerned were able to understand. Linux distribution provides a few standard encryption/decryption tools that can prove to be handy at times. Here in this article we have covered 7 such tools with proper standard examples, which will help you to encrypt, decrypt and password protect your files. If you are interested in knowing how to generate Random password in Linux as well as creating random password you may like to visit the below link: 1. GnuPG GnuPG stands for GNU Privacy Guard and is often called as GPG which is a collection of cryptographic software. Written by GNU Project in C programming Language. Latest stable release is 2.0.27. In most of the today’s Linux distributions, the gnupg package comes by default, if in-case it’s not installed you may apt or yum it from repository. $ sudo apt-get install gnupg # yum install gnupg We have a text file ( tecmint.txt) located at ~/Desktop/Tecmint/, which will be used in the examples that follows this article. ![]() Before moving further, check the content of the text file. $ cat ~/Desktop/Tecmint/tecmint.txt Now encrypt tecmint.txt file using gpg. As soon as you run the gpc command with option -c (encryption only with symmetric cipher) it will create a file texmint.txt.gpg. You may list the content of the directory to verify. $ gpg -c ~/Desktop/Tecmint/tecmint.txt $ ls -l ~/Desktop/Tecmint Note: Enter Paraphrase twice to encrypt the given file. The above encryption was done with CAST5 encryption algorithm automatically. You may specify a different algorithm optionally. To see all the encryption algorithm present you may fire. $ gpg --version Now, if you want to decrypt the above encrypted file, you may use the following command, but before we start decrypting we will first remove the original file i.e., tecmint.txt and leave the encrypted file tecmint.txt.gpg untouched. $ rm ~/Desktop/Tecmint/tecmint.txt $ gpg ~/Desktop/Tecmint/tecmint.txt.gpg Note: You need to provide the same password you gave at encryption to decrypt when prompted. Bcrypt bcrypt is a key derivation function which is based upon Blowfish cipher. Blowfish cipher is not recommended since the time it was figured that the cipher algorithm can be attacked. If you have not installed bcrypt, you may apt or yum the required package. $ sudo apt-get install bcrypt # yum install bcrypt Encrypt the file using bcrypt. $ bcrypt ~/Desktop/Tecmint/tecmint.txt As soon as you fire the above command, a new file name texmint.txt.bfe is created and original file tecmint.txt gets replaced. Decrypt the file using bcrypt. $ bcrypt tecmint.txt.bfe Note: bcrypt do not has a secure form of encryption and hence it’s support has been disabled at least on Debian Jessie. Ccrypt Designed as a replacement of UNIX crypt, ccrypt is an utility for files and streams encryption and decryption. It uses Rijndael cypher. If you have not installed ccrypt you may apt or yum it. $ sudo apt-get install ccrypt # yum install ccrypt Encrypt a file using ccrypt. It uses ccencrypt to encrypt and ccdecrypt to decrypt. It is important to notice that at encryption, the original file ( tecmint.txt) is replaced by ( tecmint.txt.cpt) and at decryption the encrypted file ( tecmint.txt.cpt) is replaced by original file ( tecmint.txt).
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