Tham khảo tài liệu 'hacker professional ebook part 192', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Table of Contents part 3 6 Capstone Clipper and DSS What is Capstone What is Clipper How does the Clipper chip work Who are the escrow agencies What is Skipjack Why is Clipper controversial What is the current status of Clipper What is DSS Is DSS secure Is use of DSS covered by any patents What is the current status of DSS 7 NIST and NSA What is NIST What role does NIST play in cryptography What is the NSA What role does the NSA play in commercial cryptography 8 Miscellaneous What is the legal status of documents signed with digital signatures What is a hash function What is a message digest What are MD2 MD4 and MD5 What is SHS What is Kerberos What are RC2 and RC4 What is PEM What is RIPEM What is PKCS What is RSAREF 6 Capstone Clipper and DSS What is Capstone Capstone is the . government s long-term project to develop a set of standards for publicly-available cryptography as authorized by the Computer Security Act of 1987. The primary agencies responsible for Capstone are NIST and the NSA see Section 7 . The plan calls for the elements of Capstone to become official . government standards in which case both the government itself and all private companies doing business with the government would be required to use Capstone. There are four major components of Capstone a bulk data encryption algorithm a digital signature algorithm a key exchange protocol and a hash function. The data encryption algorithm is called Skipjack see Question but is often referred to as Clipper which is the encryption chip that includes Skipjack see Question . The digital signature algorithm is DSS see Question and the hash function is SHS see Question about SHS and Question about hash functions . The key exchange protocol has not yet been announced. All the parts of Capstone have 80-bit security all the keys involved are 80 bits long and other aspects are .
