An Computation-Efficient Generalized Group-Oriented Cryptosystem
نویسندگان
چکیده
منابع مشابه
An Computation-Efficient Generalized Group-Oriented Cryptosystem
A Group-Oriented Cryptosystem (GOC) allows a sender to encrypt a message sent to a group of users so only the specified sets of users in that group can cooperatively decrypt the message. Recently, Li et al. pointed out unauthorized sets in the receiving group can recover the encrypted messages in Yang et al.’s GOC; and they further repaired this security flaw. However, the improved GOC contains...
متن کاملSimple Generalized Group-Oriented Cryptosystems Using ElGamal Cryptosystem
In the generalized group-oriented cryptosystem, the sender can send a conditional message to a group of users such that only the specified sets of users in this group can cooperate to decrypt this message. In this paper, we will use an ElGamal cryptosystem and an elliptic curve ElGamal cryptosystem to achieve the purposes of generalization and group-orientation, respectively. Both of our scheme...
متن کاملSecurity Flaw in Simple Generalized Group-Oriented Cryptosystem Using ElGamal Cryptosystem
A generalized group-oriented cryptosystem (GGOC) based on ElGamal cryptosystem was proposed by Yang et al. in 2003. This study shows that if the authorized decryption sets of users are not properly predetermined in Yang et al.’s GGOC, an unauthorized decryption set of users can recover the encrypted message without difficulty. This study also presents an improved protocol to resist such an attack.
متن کاملA Self-Certified Group-Oriented Cryptosystem Without a Combiner
In a (t;n) group-oriented cryptosystem, collaboration of at least t participants is required to perform the group transformation. Two important issues in implementation of a such cryptosystems are: 1. the sender needs to collect authenticated public keys of the intended receivers; 2. the combiner needs a secure channel to collect (privately) the partial results from collaborating participants. ...
متن کاملImproved self-certified group-oriented cryptosystem without a combiner
In 2001, Ghodosi and Saeednia proposed a self-certified group-oriented cryptosystem without a combiner to prevent the Susilo et al. s attack. However, in this paper we will show that their scheme is still insecure and probably suffers from the conspired attack. To remedy the weakness, an enhanced version is proposed while providing the new functionality to confirm the source of the encrypted me...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Informatica
سال: 2010
ISSN: 0868-4952,1822-8844
DOI: 10.15388/informatica.2010.290