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I need to know how to implement Diffie Hellman Key Exchange (DHKE) in java using its libraries. I know all the cryptographic theory about it so no need to go into details, I just need a very basic implementation so I cand have 2 programs share a secret key. Modification of Diffie-Hellman Algorithm to Provide More Secure Key Exchange. MODIFICATION TO THE DIFFIE HELLMAN ALGORITHM Here too, first we select a prime number ‘q’ and its primitive root ‘a’, where aDiffie Hellman key exchange protocol is used.
Diffie-Hellman Authentication
The Diffie-Hellman (DH) method of authenticating a user is nontrivial for an intruder to crack. The client and the server each have their own private key (sometimes called a secret key) which they use together withthe public key to devise a common key. They use the common key to communicate with each other, by using an agreed-upon encryption/decryption function (such as DES). This method was identified as DES authentication in previous Solaris releases.
Authentication is based on the ability of the sending system to use the common key to encrypt the current time, which the receiving system can decrypt and check against its current time. Make sure that you synchronize the time on the client and the server.
The public keys and private keys are stored in an NIS or NIS+ database. NIS stores the keys in the publickey map. NIS+ stores the keys in the cred table. These files contain the public key and the private key for all potential users.
The system administrator is responsible for setting up NIS maps or NIS+ tables, and generating a public key and a private key for each user. The private key is stored in encrypted form with the user's password. This process makes the private key known only to the user.
Implementation of Diffie-Hellman Authentication
This section describes the series of transactions in a client-server session that use DH authorization (AUTH_DH).
Generating the Public Keys and Secret Keys
Sometime prior to a transaction, the administrator runs either the newkey or nisaddcred Openssl generate key pair for ssh. command to generate a public key and a secret key. Each user has a unique public key and secret key. The public key is stored in a public database. The secret key is storedin encrypted form in the same database. To change the key pair, use the chkey command.
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Running the keylogin Command
Normally, the login password is identical to the secure RPC password. In this case, the keylogin command is not required. However, if the passwords are different, the users have to log in, and then run a keylogin command explicitly.
The keylogin command prompts the user for a secure RPC password and uses the password to decrypt the secret key. The keylogin command then passes the decrypted secret key to a program called the keyserver. The keyserver is an RPC service with a local instanceon every computer. The keyserver saves the decrypted secret key and waits for the user to initiate a secure RPC transaction with a server. Mahindra jeep images download.
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If both the login password and the RPC password are the same, the login process passes the secret key to the keyserver. If the passwords are required to be different and the user must always run the keylogin command, then the keylogin command can be includedin the user's environment configuration file, such as the ~/.login, ~/.cshrc, or ~/.profile file. Then, the keylogin command runs automatically whenever the user logs in.
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Generating the Conversation Key
When the user initiates a transaction with a server, the following occurs:
The keyserver randomly generates a conversation key.
The kernel uses the conversation key to encrypt the client's time stamp (among other things).
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The keyserver looks up the server's public key in the public key database (see the publickey(4) man page).
The keyserver uses the client's secret key and the server's public key to create a common key.
The keyserver encrypts the conversation key with the common key.
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First Contact With the Server
The transmission, which includes the encrypted time stamp and the encrypted conversation key, is then sent to the server. The transmission includes a credential and a verifier. The credential contains three components:
The client's net name
The conversation key, which is encrypted with the common key
A “window,” which is encrypted with the conversation key
The window is the difference in time that the client says should be allowed between the server's clock and the client's time stamp. If the difference between the server's clock and the time stamp is greater than the window, the server rejects the client's request. Under normal circumstances, thisrejection will not happen, because the client first synchronizes with the server before starting the RPC session.
The client's verifier contains the following:
The encrypted time stamp
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An encrypted verifier of the specified window, which is decremented by 1
The window verifier is needed in case somebody wants to impersonate a user and writes a program that, instead of filling in the encrypted fields of the credential and verifier, just stuffs in random bits. The server will decrypt the conversation key into some random key, and use it to try to decryptthe window and the time stamp. The result will be random numbers. After a few thousand trials, however, there is a good chance that the random window/time stamp pair will pass the authentication system. The window verifier makes guessing the right credential much more difficult.
Decrypting the Conversation Key
When the server receives the transmission from the client, the following occurs:
The keyserver that is local to the server looks up the client's public key in the public key database.
The keyserver uses the client's public key and the server's secret key to deduce the common key, which is the same common key that is computed by the client. Only the server and the client can calculate the common key because the calculation requires knowing one of the secret keys.
The kernel uses the common key to decrypt the conversation key.
The kernel calls the keyserver to decrypt the client's time stamp with the decrypted conversation key.
Storing Information on the Server
After the server decrypts the client's time stamp, it stores four items of information in a credential table:
The client's computer name
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The window
The client's time stamp
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The server stores the first three items for future use. The server stores the time stamp to protect against replays. The server accepts only time stamps that are chronologically greater than the last time stamp seen, so any replayed transactions are guaranteed to be rejected.
Note –Implicit in these procedures is the name of the caller, who must be authenticated in some manner. The keyserver cannot use DES authentication to authenticate the caller because it would create a deadlock. To solve this problem, the keyserver stores the secret keys by user ID (UID) and grantsrequests only to local root processes.
Returning the Verifier to the Client
The server returns a verifier to the client, which includes the following:
The index ID, which the server records in its credential cache
The client's time stamp minus 1, which is encrypted by the conversation key
The reason for subtracting 1 from the time stamp is to ensure that the time stamp is invalid and that it cannot be reused as a client verifier.
Client Authenticates the Server
The client receives the verifier and authenticates the server. The client knows that only the server could have sent the verifier because only the server knows what time stamp the client sent.
Additional Transactions
With every transaction after the first transaction, the client returns the index ID to the server in its second transaction and sends another encrypted time stamp. The server sends back the client's time stamp minus 1, which is encrypted by the conversation key.