public key infrastructure pki

... Designing a Public Key Infrastructure Tasks Request a new certificate named Web Client that uses Microsoft Base Cryptographic ... Certificate w Click OK Copyright  2002 Microsoft Corporation All Rights Reserved Designing a Public Key Infrastructure Tasks Detailed Steps Verify the installation of the certificate x In the console ... windows and log off Copyright  2002 Microsoft Corporation All Rights Reserved Designing a Public Key Infrastructure Tasks Detailed Steps Why was the Base-64 encoded binary x.509 certificate format...

Ngày tải lên: 19/10/2013, 02:15

... MiM Attack! Part Public Key Infrastructure Wouldn’t it be nice if some one we could distribute public keys AND be assured that the public key we received was the actual public key of the person ... to protect keys - explain (more) Key Recovery (133) • No need to backup public keys • The process of using backup keys is called key recovery • Key recovery should be highly audited! Key Escrow ... contains a users public key Why? • Does it make sense to put a private key in a Digital Certificate? PKI concerns • Remember PKI requires public keys (in the certificate) and private keys (kept private...

Ngày tải lên: 22/03/2014, 23:21

... public key certificate với private key để tạo public key certificate cho mật mã đầu cuối oLúc mật mã đầu cuối yêu cầu public key certificate từ mật mã đầu cuối khác Chúng sử dụng CAs public key ... cuối thử đăng ký public key với CA để có private key mà dùng để kết hợp với public key oPhát public/ private keypairs dùng để khởi tạo phase trình đăng ký oxác nhận thông số public key ophát gián ... public key để giải mã public key certificate để thu khoá thích hợp •Registration Authorities: Trong nhiều trường hợp, CA cung cấp tất dịch vụ cần thiết PKI để quản lý public key bên mạng Tuy nhiên...

Ngày tải lên: 25/07/2014, 07:21

... Generation Let K be an encryption key: K = K[0]K[1] … K[l–1], where |K|=8l, 1≤ l ≤ 256 Key Scheduling algorithm (KSA)  RC4 uses an array S[0, 255] of 256 bytes to generate subkeys  Apply a new permutation ... encryption  Weak keys: a small portion of the string could determine a large number of bits in the initial permutation, which helps reveal the secret encryption key  Reused keys:  Known-plaintext ... Modes of Operations 2.6 Stream Ciphers 2.7 Key Generations J Wang Computer Network Security Theory and Practice Springer 2009 Key Generation  Secret keys are the most critical components of encryption...

Ngày tải lên: 17/02/2014, 14:20

... each other’s public key  Alice:   Sends to Bob CA1(KAu) and CA2(KuCA1) Bob:  Uses CA2’s public key to verify CA1’s public key  Uses CA1’s public key to verify Alice’s public key J Wang Computer ... user: key ID, owner’s name, public key, encrypted private key, time stamp… Public- key rings  A table in which each row represents a record of a particular user: key ID, owner’s name, public key, ... get the other users’ public keys    Published in a special Website or by emails Cannot ensure true ownership of a public key Public- key certificates to authenticate public keys   Issued by...

Ngày tải lên: 17/02/2014, 14:20

... slightly degrade the cipher's throughput or key setup time The cipher's performance can thus reveal the Hamming weight of the key, ; 56 P56 56 3:95 bits of key inforwhich provides an average of n=0 ... Processing Standards Publication 46, January 1977 National Institute of Standards and Technology, \Digital Signature Standard," Federal Information Processing Standards Publication 186, May 1994 ... 86-96 R.L Rivest, A Shamir, and L.M Adleman, \A method for obtaining digital signatures and public- key cryptosystems," Communications of the ACM, 21, 1978, pp 120-126 P.R Rogaway and D Coppersmith,...

Ngày tải lên: 19/03/2014, 13:43

... complements rather than replaces private key cryptography Public- Key Cryptography • public- key/ two -key/ asymmetric cryptography involves the use of two keys: • a public- key, which may be known by anybody, ... claiming is sent by sender Public- Key Cryptography • probably most significant advance in • • • • the 3000 year history of cryptography uses two keys – a public key and a private key asymmetric since ... signatures cannot decrypt messages or create signatures Public- Key Cryptography Why Public- Key Cryptography? • developed to address two key issues: • key distribution – how to have secure communications...

Ngày tải lên: 29/03/2014, 15:20

... private key – Key echange: Two sides cooperate two exhange a session key Henric Johnson 18 Requirements for PublicKey Cryptography Computationally easy for a party B to generate a pair (public key ... Encryption algorithm Public and private key Ciphertext Decryption algorithm Henric Johnson 15 Encryption using Public- Key system Henric Johnson 16 Authentication using PublicKey System Henric Johnson ... Authentication • Secure Hash Functions and HMAC • Public- Key Cryptography Principles • Public- Key Cryptography Algorithms • Digital Signatures • Key Management Henric Johnson Authentication • Requirements...

Ngày tải lên: 29/03/2014, 16:20

... each arc (u, v) denotes a certificate associated to v’s public key, signed with u’s private key Each node u has a public key, a private key, and two certificate repositories, the updated and the ... public- key management scheme are: (1) Certificate Management: (a) Key generation: the node generates its keys by itself (b) Certificate issuance: each node issues certificates that bind public keys ... model Each node u generates by itself the pair formed by its public key and its secret key Then a request for signing the generated public key is sent to u’s neighbours Since these nodes are in a...

Ngày tải lên: 21/06/2014, 11:20

... chmod 700 ~/.ssh cat id_rsa.pub >> ~/.ssh/authorized_keys chmod 600 ~/.ssh/authorized_keys mv id_rsa.pub ~/.ssh logout We have to delete the public key on the desktop, because otherwise the SSH client ... Then you can log in only with a key- pair, so be careful not to lose it! It's purely optional but safe to activate! But before doing it, please make sure that key- based authentication is working ... careful: if you disable password authentication, then you won't be able to log in with passwords! Only keybased authentication will be available! ...

Ngày tải lên: 03/07/2014, 16:21

... Session keys are usually keys of a secret -key cryptosystem Master keys are usually used for longer time and need therefore be carefully stored.Master keys are usually keys of a public- key cryptosystem ... to encrypt twice the same plaintext with the same public key (and different error vectors) Public- key cryptograph 25 IV054 FINAL COMMENTS Public- key cryptosystems can never provide unconditional ... some secret -key cryptosystem Public- key cryptograph IV054 Secure communication with secret -key cryptosystems without any need forsecret key distribution (Shamir's no -key algorithm) Basic assumption:...

Ngày tải lên: 11/07/2014, 20:21

... Distribution of Public Keys  There are several techniques proposed for the distribution of public keys: – Public announcement – Publicly available directory – Public key authority – Public key certificates ... establishment of keys  Task: If the participants not physically meet, then how the participants establish a shared key?  Two types of key establishment: – Key Agreement – Key Distribution Key Distribution ... pretend to be User A, but really announce User B’s public key Public Directory Service  Idea: Have a public directory or “phone book” of public keys This directory is under the control/maintenance...

Ngày tải lên: 17/02/2014, 15:20

... The Value of Improved Public Services: An Application of the Choice Experiment Method to Estimate the Value of Improved Wastewater Treatment Infrastructure in India Ekin Birol International ... PAPER 51/2010 The Value of Improved Public Services: An Application of the Choice Experiment Method to Estimate the Value of Improved Wastewater Treatment Infrastructure in India Ekin Birol and ... and (ii) whether the public s aggregated willingness to pay (WTP) to this end is sufficient to offset the costs of improvements in the capacity and technology of the STP The public s valuation...

Ngày tải lên: 18/02/2014, 01:20

... efficient use of public investments in infrastructure refers to the use of public investments in infrastructure so as to maximize the competitiveness of a nation in terms of infrastructure development ... raises the question about the efficiency in the use of public investments in infrastructure Examining how to use public investments in infrastructure more efficiently to support trade and economic ... in the way infrastructure of a country is planned and built This study also attempts to isolate key factors in the process that could limit the efficient use of public investments in infrastructure...

Ngày tải lên: 10/09/2015, 09:01

... by KPMG LLP (UK)’s Design Services Publication name: The Changing Face of Infrastructure: Frontline views from the public sector Publication number: RRD-178520 Publication date: January 2010 Printed ... next steps to support infrastructure development – a key part of stimulus programs worldwide Seeking views and opinions from leading public sector officials involved in infrastructure has been ... Face of Infrastructure: Public sector perspectives, KPMG International, 2010 Bridging the Global Infrastructure Gap: Views from the Executive Suite, January 2009 2 The Changing Face of Infrastructure: ...

Ngày tải lên: 06/12/2015, 23:15

Ngày tải lên: 06/08/2012, 15:04

... VOCABULARY a meat Raw home-made S steak frozen meal spicy chicken 10 takeaway b a knife a fork a napkin / serviette a glass S prawns fried eggs strawberries salt and pepper stress on 3rd syllable:...

Ngày tải lên: 07/08/2012, 09:49