Digital it Signatures. Message Authentication Codes. Message Hash. Security. COMP755 Advanced OS 1
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1 Digital Signatures Digital it Signatures Offer similar protections as handwritten signatures in the real world. 1. Difficult to forge. 2. Easily verifiable. 3. Not deniable. 4. Easy to implement. 5. Differs from document to document. Message Hash A message hash is a checksum like value or condensed version of a file. Any change to a file will produce a different message Message hashes are one way functions. There is no known method of creating a data file to match a known message SHA-1 is a Standard Hash Algorithm SHA-1 creates a 160 bit hash value Message Authentication Codes A message authentication code (MAC) verifies that t the message has not been modified by anyone who does not know the key MAC is created by encrypting a message Any encryption algorithm can be used. COMP755 Advanced OS 1
2 MAC Use When creating the file compute the hash encrypt the hash append the hash to the file When reading the file compute the hash encrypt your hash compare your hash to the one in the file Digital Signature Digitally signed messages can have clearly viewed plaintext in the body of the message, the objective is to verify the sender. With RSA public key encryption either key can be used to encrypt or decrypt. Digital Signature Process A hash of the data is created. The name of the sender is appended to the The hash is encrypted with the private key of the sender. The hash is appended to the data and transmitted together. The receiver decrypts the hash h with the public key of the sender. The receiver calculates a hash of the message and compares it to the received User1 Plaintext One Way Hash Condensed Bits Public Key Encryption E Digital Signature + Signature Private Key (general - public key) Remote Public Key Directory: Network Plaintext + Signature One Way Hash D Public Key C User2 Verifiable Output Compare hashes Public Key Decryption COMP755 Advanced OS 2
3 Digital Signature Use Digitally signed verifies the sender. Signed applets or programs come from a known source and have not been modified. Digitally signed programs cannot be modified or infected with a virus without detection Digitally signed documents cannot be changed without detection. Key Distribution If you are going to rely on public key encryption, it is necessary to ensure the authenticity of public keys. Keys can be distributed by Key Servers Digital Certificates Key Servers Key servers are computers that have a database of public keys. Upon receiving a request for a public key, a key server sends the client the desired public key. The messages from the key server are digitally i signed. Clients have to know the key server s public key. Digital Certificates A digital certificate contains a user s public key along with some information about the user, such as their address. The digital certificate is digitally signed by a Certificate Authority. Certificate Authorities are venders of digital certificates. Clients must know the public key of the Certificate Authority. COMP755 Advanced OS 3
4 Digital Certificates University Certificates A chain of trust can be established from a single point in an organization. Only the top public key is needed by everyone Buying Digital Certificates Several companies sell digital certificates They are usually expensive Creating Digital Certificates Security tools available with Java SDK Tool Name Brief Description keytool Manage keystores and certificates. jarsigner Generate and verify JAR signatures policytool GUI tool for managing policy files. COMP755 Advanced OS 4
5 Security Tool Documentation The security tools are command line programs with many options win32/keytool.html win32/jarsigner.html KeyStore The Java key tools use a keystore as a place to securely keep key entries trusted certificate entries A keystore can be encrypted for security Implemented as a file containing the information Signing Assignment Create a digital certificate containing your name Digitally sign a jar file containing your steganography program Send it to me by Wednesday, January 27 COMP755 Advanced OS 5
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