{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 5 - Class Notes Thursday RSA lab Cryptanalysis 1...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Class Notes September 23, 2008 Thursday: RSA lab Cryptanalysis: 1. Cipher-text only attack (cryptanalyst has access only to cipher text) 2. Full or partial access to plain-text attack (or known plain-text attack) a. For example when the attacker has official release of document, and a suspected cipher-text, do the two match? 3. Cipher-text of any plain-text a. When the cryptanalyst has the ability to acquire the cipher-text for any desired plain- text message and compare the two (also called the chosen plain-text attack) 4. Attacker knows the algorithm and the cipher-text a. Encrypt several plaintext to find the one that matches the given cipher-text 5. Attacker has cipher-text and plain-text and wants to find the key Areas of Weaknesses: 1. Humans (make mistakes) 2. Hardware and Software implementation Today’s Algorithms: Until 90’s DES was used by the government. DES was developed in 1977 by IBM for use by the public. DES standardized encryption for parties that wanted to securely communicate. Called DEA and DEA1. DES is a careful combination of substitutions and transpositions.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern