encryption-asymmetric

I have been over an article at CodeProject a for a while that explains how to encrypt and decrypt using the RSA provider: RSA Private Key Encryption While the old version from 2009 was buggy, the new 2012 version (with System.Numerics.BigInteger support) seems more reliable. What this version lacks though is a way to encrypt with a public key and decrypt using the private key. So, I tried it myself but get garbage when I decrypt. I'm not familiar with the RSA provider, so I'm in the dark here. It's hard to find more info on how this is supposed to work. Does anyone see what is wrong with this?

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

From whatever little I understand by reading various material, public-private key pair are the basis of assymetric encryption and also something about choosing 2 prime numbers (which is roughly your private key) and multiplying them (which is roughly your public key), I appears that it is possible to generate a public key if you know the private key. Is it correct or I am mistaking something? [EDIT] What made me more confusing was that it is not possible to serialize the RSA key to XML with only private key (using .NET class RSACryptoServiceProvider). Not sure whether this limitation is

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:

When calling the following function : byte[] bytes = rsa.Encrypt(System.Text.UTF8Encoding.UTF8.GetBytes(stringToEncrypt), true); I am now getting the error: bad length. With a smaller string it works, any ideas what the problem could be the string I am passing is under 200 characters. blowdart RSA encryption is only mean for small amounts of data, the amount of data you can encrypt is dependent on the size of the key you are using, for example for 1024 bit RSA keys, and PKCS # 1 V1.5 padding, you can encrypt 117 bytes at most, with a 2048 RSA key, you can encrypt 245 bytes. There's a good