public-key-encryption

I have a system that requires a RSA keypair to be generated in javascript, have the public key then stored in a database at the server side (as a string), then the server side which is in Java will encrypt a string with the stored public key and send it to the client side which will decrypt the string with the private key. I'm using a browsified version of node-rsa on my client browser. First at the client i generate a keypair and export the keys, storing them as strings var NodeRSA = require('node-rsa'); var key = new NodeRSA({b: 1024}); key.exportKey("pkcs8-private"); key.exportKey("pkcs8

Error received while decrypting data when private key is retrieved from HSM. I have added sunpkcs11 provider in java.security. Hence, NOT adding provider via code. Text gets encrypted successfully. However, while decrypting the encrypted text, I am getting below error at below line: cipher.init(Cipher.DECRYPT_MODE, privateKey); What is that i am missing here? Error: Caused by: java.security.InvalidKeyException: Private key must be instance of RSAPrivate(Crt)Key or have PKCS#8 encoding at sun.security.pkcs11.P11RSAKeyFactory.implTranslatePrivateKey(P11RSAKeyFactory.java:101) [sunpkcs11.jar:1.7

I understand that through SSL, the browser gets the public key of the secured website and through public key encryption rsa algorithm, these 2 establish session key and then continue communication thru some symmetric algorithm, because symmetric key encryption/decryption is faster. Which symmetric key algorithm does SSL use? DES? AES? or something else? When the client connects to the server, it negotiates a so-called ciphersuite (combination of encryption, key exchange, authentication algorithms) to use. Each SSL client or server has a list of allowed ciphersuites and during handshake the

I would like to encrypt a secret text by public-key and decrypt it by private-key in Python. I can achieve that with the openssl command: echo "secrettext/2011/09/14 22:57:23" | openssl rsautl -encrypt -pubin -inkey public.pem | base64 data.cry base64 -D data.cry | openssl rsautl -decrypt -inkey private.pem How would one implement that in Python? jfs Encrypt #!/usr/bin/env python import fileinput from M2Crypto import RSA rsa = RSA.load_pub_key("public.pem") ctxt = rsa.public_encrypt(fileinput.input().read(), RSA.pkcs1_oaep_padding) print ctxt.encode('base64') Decrypt #!/usr/bin/env python

I have the modulus & exponent of an RSA public key embedded into a binary file, and I am trying to extract the entire blob and create a usable .pem public key. Currently, I am extracting the full 260 bytes (4 bytes for the exponent, 256 bytes for the modulus) and encoding as base64. I am doing that using the following shell command : tail -c $((filesize - start_of_key_data)) filename | head -c $size_of_key_data | base64 > outkey This gives me the following string : <<<<<< modulus & exponent extracted from binary file, base64-encoded >>>>>> tZyrQA6cZFJfVm6FyXwtZaLQYg8EecuO+ObrHTwc8JO

In explanations I've read about public key cryptography, it is said that some large number is come up with by multiplying together 2 extremely large primes. Since factoring the product of large primes is almost impossibly time-consuming, you have security. This seems like a problem that could be trivially solved with rainbow tables. If you know the approximate size of primes used and know there are 2 of them, you could quickly construct a rainbow table. It'd be a mighty large table, but it could be done and the task could be parallelized across hardware. Why are rainbow tables not an effective

I am having issues setting up OpenSSH for Windows, using public key authentication. I have this working on my local desktop and can ssh with a key from Unix machines or other OpenSSH for Windows machines. I have replicated the build onto a server, I can get password authentication working fine, but when I use the keys I get the following issue: debug1: Authentications that can continue: publickey,password,keyboard-interactive debug3: start over, passed a different list publickey,password,keyboard-interactive debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup