The crc tag has no wiki summary.
3
votes
1answer
97 views
Can i modify data “protected” by a CRC16?
There are 100 bytes with a CRC16. However I only know the first 50.
I want to change byte 5 from a known value X to another value Y, and fix up the CRC16 to be valid - without knowing bytes 50-100.
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2
votes
4answers
210 views
Increased CRC collision probability when adding bits to input message
The Scenario
I have a message string I need to transport over a wireless network that may be unreliable. This message string is about 100 bits long, and is packaged with an 8-bit CRC. When the ...
5
votes
1answer
404 views
How do I calculate CRC32 mathematically?
I want to calcuate the CRC32 (algorithm http://www.libpng.org/pub/png/spec/1.2/PNG-CRCAppendix.html ) using polynomials directly but I don't know how. I found the generating polynomial listed here ...
1
vote
1answer
360 views
Finding CRC collisions for specific divisor
My current textbook (Information Security: Principles and Practice by Mark Stamp) discusses how to determine the CRC of data via long-division, using XOR instead of subtraction to determine the ...
5
votes
3answers
576 views
Understanding CRC
There are zillions of articles describing CRC. What can I ready to understand more deeply what's really going on? Both from an algebraic perspective and a bit-manipulation perspective, I'd like to ...
3
votes
2answers
882 views
Brute forcing CRC-32
I'm working on a cryptosystem which uses IDEA. The designer made the mistake of including a CRC-32B hash of the password unencrypted in the header, so that the system can quickly reject bad ...
5
votes
4answers
1k views
What alphanumeric string length can be used to guarantee no hash collisions from CRC-64?
If I'm hashing alphanumeric strings (chars in the set 0-9, a-...
