Article · Wikipedia archive · Last revised Jun 21, 2026

EnRUPT

EnRUPT is a block cipher and a family of cryptographic algorithms based on XXTEA. EnRUPT hash function was submitted to SHA-3 competition but it wasn't selected to the second round.

Last revised
Jun 21, 2026
Read time
≈ 1 min
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157 w
Citations
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Wikipedia ↗
EnRUPT
A diagram for the EnRUPT block cipher.
One round of EnRUPT1
General
First published2008
Derived fromCorrected Block TEA
Cipher detail
Key sizesvariable
Block sizesarbitrary, at least two words (64 bits)
StructureUnbalanced Feistel Network
Rounds8 * (plaintext words) + 4 * (key words)
Best public cryptanalysis
2480 complexity meet-in-the-middle preimage attack against EnRUPT hash,2

collision attack with 240 time complexity3

Chosen plaintext attack with 215 queries against EnRUPT block cipher4

EnRUPT is a block cipher and a family of cryptographic algorithms based on XXTEA.15 EnRUPT hash function was submitted to SHA-3 competition but it wasn't selected to the second round.

References

References

  1. Sean O'Neil (2008). "EnRUPT: First all-in-one symmetric cryptographic primitive" (ZIP). Workshop Record. SASC 2008 workshop.
  2. Khovratovich, Dmitry; Nikolić, Ivica (2008). "Cryptanalysis of EnRUPT" (PDF).
  3. Sebastiaan Indesteege; Bart Preneel (2009). "Practical Collisions for EnRUPT" (PDF). In Orr Dunkelman (ed.). Fast Software Encryption. FSE 2009. pp. 246–259. doi:10.1007/978-3-642-03317-9_15.
  4. Yarrkov, Elias (2010). "Cryptanalysis of block EnRUPT" (PDF).
  5. Sean O'Neil; Karsten Nohl; Luca Henzen. "EnRUPT Hash Function Specification" (PDF). Archived from the original (PDF) on 13 July 2010.