ISC - The ISAAC Stream Cipher Icon

ISC - The ISAAC Stream Cipher


ISC lets you encrypt & decrypt text and files of any type up to 4GB

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ISAAC is a cryptographically secure pseudo-random number generator (CSPRNG) and stream cipher. It was developed by Bob Jenkins from 1993-1996 and placed in the Public Domain. ISAAC is fast - especially when optimised - and portable to most architectures in nearly all programming and scripting languages.

After more than 20 years of existence ISAAC has not been broken, and the little program you have here allows you to use it to encrypt and decrypt text of arbitrary length, files of any type, on a key-phrase of any complexity.

ISC is a symmetric key encryption system, which means that both the sender and recipient of a message must possess the key.

ISC - The ISAAC Stream Cipher Web Site


  • Encrypt and decrypt files of any type
  • Encrypt and decrypt messages of arbitrary length
  • Size of ciphered files limited only by your system resources (up to 4GB per file)
  • Highest security built on Bob Jenkins' unbroken ISAAC CSPRNG
  • Tiny footprint - with pipeable / redirectable output
  • Package includes Linux and Windows executables, along with the full source code.
  • Easily called from any other language or script (php, bash, perl, c etc)
  • Cross-platform: Supports all 32-bit+ architectures for which there is a Free Pascal compiler.


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Additional Project Details

Intended Audience

Advanced End Users, Other Audience, Testers

User Interface

Console/Terminal, Command-line

Programming Language

Free Pascal



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