Page History

...

Code Block

bgColor	#ccccff

import java.security.SecureRandom;
import java.security.NoSuchAlgorithmException;
// ...

public static void main (String args[]) {
   try {
     SecureRandom number = SecureRandom.getInstance("SHA1PRNG");
     // Generate 20 integers 0..20
     for (int i = 0; i < 20; i++) {
       System.out.println(number.nextInt(21));
     }
   } catch (NoSuchAlgorithmException nsae) { 
     // Forward to handler
   }
}

Exceptions

MSC02-EX1EX0: Using the default constructor for java.util.Random applies a seed value that is "very likely to be distinct from any other invocation of this constructor" (API 2006), and may improve security marginally. As a result, it may only be used for non-critical applications operating on non-sensitive data. Java's default seed uses the system's time in milliseconds. When used, explicit documentation of this exception is required.

...

<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="55b2430b8456bcb3-5902cd49-43c34249-bddaa35b-eaba1599a83db8afcabbb37f"><ac:plain-text-body><![CDATA[	[[API 2006	https://www.securecoding.cert.org/confluence/display/java/AA.+Java+References#AA.JavaReferences-API06]]	[Class Random	http://java.sun.com/javase/6/docs/api/java/util/Random.html]	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="a5436bde271abe1c-b7d0219b-46ad4ecb-af68af66-d3e9de99e26a9660ac5a7e5b"><ac:plain-text-body><![CDATA[	[[API 2006	https://www.securecoding.cert.org/confluence/display/java/AA.+Java+References#AA.JavaReferences-API06]]	[Class SecureRandom	http://java.sun.com/javase/6/docs/api/java/security/SecureRandom.html]	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="bcff40bce01adb8f-e89be6fc-4f3a489d-a58e9a3e-4aa1ed55d887a8efdd2ee038"><ac:plain-text-body><![CDATA[	[[Find Bugs 2008	https://www.securecoding.cert.org/confluence/display/java/AA.+Java+References#AA.JavaReferences-FindBugs08]]	BC: Random objects created and used only once	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="a546fafdc5c80e1c-84fa7831-4a0a4836-a401a344-81ec5688082b671a9ea7a03c"><ac:plain-text-body><![CDATA[	[[Monsch 2006	AA. Bibliography#Monsch 06]]		]]></ac:plain-text-body></ac:structured-macro>

...

Space shortcuts

Page tree

Versions Compared

Old Version 82

New Version 83

Key

Exceptions