CONCEPT FOR Blow Fish ALGORITHM IN CRYPTOGRAPHY
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QUIZMASTER : GOWTHAM S, BCom (2022-25 BATCH), THE QUIZ CLUB OF PSGCAS
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Reiki Yoga “Money Part 2”
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Make sure to Attend our Part one, before entering Class. TY and Namaste’
Topics: The Energy Themes are Matrix, Alice in Wonderland, and Goddess. Discovering, “Who Are You?” - In Wonderland Terms. “What do you need? Are there external factors involved? Are there inner blocks from old programming? How can you shift this reality?
There’s no judgement, no harshness, it’s all about deep thoughts and healing reflections. I am on the same journey. So, this is from Reiki and Yoga Experience thus far.
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CONCEPT FOR Blow Fish ALGORITHM IN CRYPTOGRAPHY
- 1. V.SIVA PRASAD SIR C R REDDY COLLEGE, ELURU
- 2. Keyed, symmetric block cipher Designed in 1993 . Can be used as a drop-in repl acement for DES.
- 3. As a fast, free alternative to existing encryption algorithms. Variable-length key. From 32 bits to 448 bits.
- 4. Analyzed considerably Gained acceptance as a strong encryption algorithm. Blowfish is unpatented and license-free, and is available free for all uses. No effective cryptanalysis has been found to date. More attention is now given to block ciphers with a larger block size, such as AES or Twofish.
- 5. Two parts: Expansion of the key. Encryption of the data. Expansion of the key: Break the original key into a set of subkeys. Key of no more than 448 bits is separated into 4168 bytes. P-array and four 32-bit S-boxes. P-array contains 18 32-bit subkeys. Each S-box contains 256 entries.
- 6. The encryption of the data: 64-bit input is denoted with an x P-array is denoted with a Pi (where i is the iteration). 64-bit block size Key length - 32 bits to 448 bits (32-448 bits in steps of 8 bits; default 128 bits). 16-round Feistel cipher Large key-dependent S-boxes.
- 7. Each line - 32 bits. Algorithm keeps two sub-key arrays: The 18-entry P-array Four 256-entry S-boxes. S-boxes accept 8-bit input Produce 32-bit output. One entry of P-array is used every round. After final round, each half of data block is XORed with one of the two remaining unused P- entries.
- 8. Initialize the P-array and S-boxes XOR subkey with plaintext. (example) P1 XOR (first 32 bits of key), P2 XOR (second 32 bits of key), ... New output of XL is apply to function . Output of function is XOR with XR bits Then perform swap operation. Repeat 16 times.
- 9. Diagram of Blowfish's F function
- 11. Blowfish's F-function. Splits the 32-bit input into four eight-bit quarters, and uses the quarters as input to the S-boxes. Outputs are added modulo 232 and XORed to produce the final 32-bit output. Blowfish is a Feistel network, it can be inverted simply by XORing P17 and P18 to the ciphertext block, then using the P-entries in reverse order.
- 12. The Function F