Abstract:
Nowadays, the security of the information exchanged
is very important. In this paper, MD5 is used for computing the
hash value of the message and RSA is used for signing the
message and verifying the digital signature. When as sender
wishes to send a signed message to a receiver , the sender
requests a certificate to the trusted Certification Authority. The
sender hashes the plaintext and signs the hashed message with
sender’s private key to form a digital signature and encrypts the
plaintext with receiver’s public key and sends the ciphertext and
signature . The receiver decrypts the ciphertext and hashes the
plaintext with the same hash function from the signature. If the
results are exactly equal, the signature is valid and the receiver
can read the message from the sender.
