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Questions tagged [isaac]

Questions about ISAAC stream cipher.

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1answer
74 views

Maximum security strength in bits of ISAAC cipher?

Wikipedia claims key length can be very big in this cipher, so I assume it can offer a million bits of security provided entropy of key is the same? Of course I can SHA-256 hash the key to allow any ...
1
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0answers
244 views

What is the purpose of ISAAC's randinit() function?

I am a relative crypto noob; please aim your answers accordingly. :) I'm planning to port the ISAAC CSPRNG algorithm to modern C++. I'm looking at Bob Jenkins' reference implementations: http://...
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2answers
89 views

Isaac nth number from run

Is there a way of getting the nth random number from a particular seed run in ISAAC? i.e. one day run a selection of 256 numbers and the next day run from the 256th number to get the next 256 random ...
3
votes
1answer
71 views

Is the output of ISAAC still secure if I take the 32 bit number mod 8?

I'm using ISAAC for encryption but only need an 8 bit number. So, if I use N mod 255, I presume the output would be only a random sequence of 255 numbers... but is ...
3
votes
1answer
708 views

Fast crytographically secure Pseudo-Random number generator in software

What are the methods for generating pseudo-random numbers in software? I have seen methods where people use SHA implementations from openssl to hash a random message as source of entropy, or using AES ...
3
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2answers
1k views

Why is ISAAC not a pseudo random number generator?

I have been accused of confusion over the nature of the ISAAC algorithm. The bulk of evidence suggests that it is a cryptographically strong pseudo random number generator. By bulk I mean the number ...
6
votes
1answer
824 views

Is ISAAC Cipher Cryptographically Secure?

http://en.wikipedia.org/wiki/ISAAC_(cipher) This question was asked before but the answers seem vague, and I want to know about ISAAC specifically, not ISAAC+. It seems some cryptanalysis was ...
4
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1answer
1k views

How secure is my OTP program?

I'm writing a one-time pad encryption program because I got really interested in the idea of "encryption which has been proven to be impossible to crack if used correctly". I'm writing the program ...
7
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2answers
2k views

Is ISAAC considered secure as a cryptographic random number generator?

The ISAAC site claims it is secure, but I wasn't aware of any trusted 3rd party sources that verified its security.