public-key-encryption

I have to transfer some sensitive information over a JavaScript AJAX Call, over an unencrypted channel (HTTP, not HTTPS). I'd like to encrypt the data, but encryption on the JavaScript side means I expose the key, which makes symmetric encryption only an exercise in security by obscurity. Is there any asymmetric encryption for JavaScript? That way, I can keep the Server decryption key secret. (I'm not worried about the security of Server > JavaScript messages, only about the security of a certain JavaScript > Server message) The reason why you need encryption at all is probably to protect

I am searching for an algorithm for file encryption/decryption which satisfies the following requirements: Algorithm must be reliable Algorithm should be fast for rather big files Private key can be generated by some parameter (for example, password) Generated private key must be compatible with public key (public key is generated only once and stored in database) Is there any Ruby implementation of suggested algorithms? Note Well: As emboss mentions in the comments, this answer is a poor fit for an actual system. Firstly, file encryption should not be carried out using this method (The lib

I am using RSA to encrypt username and password on Android and decrypt them on server (tomcat 6, java 1.6). Android Encryption: PublicKey pubKey = readPublicKeyFromFile(mod, ex); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] cipherData = cipher.doFinal(data); return cipherData; Java Tomcat Decryption: PrivateKey pubKey = readPrivateKeyFromFile(mod, ex); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, pubKey); byte[] cipherData = cipher.doFinal(data); return cipherData; If I use the android part OUTSIDE android (Just in a

I'm making a program in Python to be distributed to windows users via an installer. The program needs to be able to download a file every day encrypted with the user's public key and then decrypt it. So I need to find a Python library that will let me generate public and private PGP keys, and also decrypt files encrypted with the public key. Is this something pyCrypto will do (documentation is nebulous)? Are there other pure Python libraries? How about a standalone command line tool in any language? All I saw so far was GNUPG but installing that on Windows does stuff to the registry and throws

I'm looking for a way to programmatically create ssh compatible id_rsa and id_rsa.pub files in Java. I got as far as creating the KeyPair: KeyPairGenerator generator; generator = KeyPairGenerator.getInstance("RSA"); // or: generator = KeyPairGenerator.getInstance("DSA"); generator.initialize(2048); keyPair = generator.genKeyPair(); I can't figure out however how to create the String representation of the PrivateKey and PublicKey in the KeyPair. Jcs The key format used by ssh is defined in the RFC #4253 . The format for RSA public key is the following : string "ssh-rsa" mpint e /* key public

I need to encrypt a string using a public key (pem file), and then sign it using a private key (also a pem). I am loading the pem files fine: publicCert = fs.readFileSync(publicCertFile).toString(); but after hours of scouring google I can't seem to find a way to encrypt data using the public key. In php I simply call openssl_public_encrypt, but I don't see any corresponding function in node or in any modules. If anyone has any suggestions, let me know. Jacob McKay No library necessary friends, Enter crypto Here's a janky little module you could use to encrypt/decrypt strings with RSA keys: