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Modern Block Ciphers

Modern Block Ciphers. CSIS 5857: Encoding and Encryption. Block Ciphers. Encrypting one bit at a time ineffective (only one possible substitution: 1 ? 0, 0 ? 1) Must map one block of plaintext bits to ciphertext Example: 11010010 ? 01101011 Key question: Good block size

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Lesson 9-1

Lesson 9-1. Reflections or Flips. Objectives. Draw reflected images Across x-axis Across y-axis Across origin Across line y = x Recognize and draw lines of symmetry and points of symmetry How many lines of symmetry in a figure? How many points of symmetry in a figure?. Vocabulary.

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C key - PowerPoint PPT Presentation

Modern Block Ciphers

Lesson 9-1