diff --git a/core/src/main/kotlin/com/r3corda/core/Utils.kt b/core/src/main/kotlin/com/r3corda/core/Utils.kt
index feaa452380..e453006ec3 100644
--- a/core/src/main/kotlin/com/r3corda/core/Utils.kt
+++ b/core/src/main/kotlin/com/r3corda/core/Utils.kt
@@ -4,6 +4,7 @@ import com.google.common.io.ByteStreams
 import com.google.common.util.concurrent.ListenableFuture
 import com.google.common.util.concurrent.MoreExecutors
 import com.google.common.util.concurrent.SettableFuture
+import com.r3corda.core.crypto.newSecureRandom
 import org.slf4j.Logger
 import java.io.BufferedInputStream
 import java.io.InputStream
@@ -36,7 +37,7 @@ fun String.abbreviate(maxWidth: Int): String = if (length <= maxWidth) this else
  * Returns a random positive long generated using a secure RNG. This function sacrifies a bit of entropy in order to
  * avoid potential bugs where the value is used in a context where negative numbers are not expected.
  */
-fun random63BitValue(): Long = Math.abs(SecureRandom.getInstanceStrong().nextLong())
+fun random63BitValue(): Long = Math.abs(newSecureRandom().nextLong())
 
 // Some utilities for working with Guava listenable futures.
 fun <T> ListenableFuture<T>.then(executor: Executor, body: () -> Unit) = addListener(Runnable(body), executor)
@@ -200,4 +201,4 @@ fun extractZipFile(zipPath: Path, toPath: Path) {
     }
 }
 
-// TODO: Generic csv printing utility for clases.
\ No newline at end of file
+// TODO: Generic csv printing utility for clases.
diff --git a/core/src/main/kotlin/com/r3corda/core/crypto/CryptoUtilities.kt b/core/src/main/kotlin/com/r3corda/core/crypto/CryptoUtilities.kt
index a3a7134330..707642edce 100644
--- a/core/src/main/kotlin/com/r3corda/core/crypto/CryptoUtilities.kt
+++ b/core/src/main/kotlin/com/r3corda/core/crypto/CryptoUtilities.kt
@@ -42,7 +42,7 @@ sealed class SecureHash private constructor(bits: ByteArray) : OpaqueBytes(bits)
         @JvmStatic fun sha256Twice(bits: ByteArray) = sha256(sha256(bits).bits)
         @JvmStatic fun sha256(str: String) = sha256(str.toByteArray())
 
-        @JvmStatic fun randomSHA256() = sha256(SecureRandom.getInstanceStrong().generateSeed(32))
+        @JvmStatic fun randomSHA256() = sha256(newSecureRandom().generateSeed(32))
     }
 
     abstract val signatureAlgorithmName: String
@@ -165,4 +165,4 @@ operator fun KeyPair.component1() = this.private
 operator fun KeyPair.component2() = this.public
 
 /** A simple wrapper that will make it easier to swap out the EC algorithm we use in future */
-fun generateKeyPair() = EddsaKeyPairGenerator().generateKeyPair()
\ No newline at end of file
+fun generateKeyPair() = EddsaKeyPairGenerator().generateKeyPair()
diff --git a/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGraphSearchTests.kt b/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGraphSearchTests.kt
index 247e5e05c8..be5bc771b0 100644
--- a/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGraphSearchTests.kt
+++ b/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGraphSearchTests.kt
@@ -1,5 +1,6 @@
 package com.r3corda.core.contracts
 
+import com.r3corda.core.crypto.newSecureRandom
 import com.r3corda.core.node.services.testing.MockTransactionStorage
 import com.r3corda.core.testing.DUMMY_NOTARY
 import com.r3corda.core.testing.MEGA_CORP_KEY
@@ -16,7 +17,7 @@ class TransactionGraphSearchTests {
         }
     }
 
-    fun random31BitValue(): Int = Math.abs(SecureRandom.getInstanceStrong().nextInt())
+    fun random31BitValue(): Int = Math.abs(newSecureRandom().nextInt())
 
     /**
      * Build a pair of transactions. The first issues a dummy output state, and has a command applied, the second then
@@ -70,4 +71,4 @@ class TransactionGraphSearchTests {
 
         assertEquals(expected, actual)
     }
-}
\ No newline at end of file
+}
diff --git a/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGroupTests.kt b/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGroupTests.kt
index c2e60ed365..520188611c 100644
--- a/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGroupTests.kt
+++ b/core/src/test/kotlin/com/r3corda/core/contracts/TransactionGroupTests.kt
@@ -2,6 +2,7 @@ package com.r3corda.core.contracts
 
 import com.r3corda.core.crypto.Party
 import com.r3corda.core.crypto.SecureHash
+import com.r3corda.core.crypto.newSecureRandom
 import com.r3corda.core.node.services.testing.MockStorageService
 import com.r3corda.core.testing.*
 import org.junit.Test
@@ -33,7 +34,7 @@ class TransactionGroupTests {
         }
         interface Commands : CommandData {
             class Move() : TypeOnlyCommandData(), Commands
-            data class Issue(val nonce: Long = SecureRandom.getInstanceStrong().nextLong()) : Commands
+            data class Issue(val nonce: Long = newSecureRandom().nextLong()) : Commands
             data class Exit(val amount: Amount<Currency>) : Commands
         }
     }
@@ -178,4 +179,4 @@ class TransactionGroupTests {
         }.toSet()
         TransactionGroup(ltxns, emptySet()).verify()
     }
-}
\ No newline at end of file
+}
diff --git a/core/src/test/kotlin/com/r3corda/core/serialization/TransactionSerializationTests.kt b/core/src/test/kotlin/com/r3corda/core/serialization/TransactionSerializationTests.kt
index 1ab212e742..26cfd74992 100644
--- a/core/src/test/kotlin/com/r3corda/core/serialization/TransactionSerializationTests.kt
+++ b/core/src/test/kotlin/com/r3corda/core/serialization/TransactionSerializationTests.kt
@@ -3,6 +3,7 @@ package com.r3corda.core.serialization
 import com.r3corda.core.contracts.*
 import com.r3corda.core.crypto.Party
 import com.r3corda.core.crypto.SecureHash
+import com.r3corda.core.crypto.newSecureRandom
 import com.r3corda.core.node.services.testing.MockStorageService
 import com.r3corda.core.seconds
 import com.r3corda.core.testing.*
@@ -34,7 +35,7 @@ class TransactionSerializationTests {
         }
         interface Commands : CommandData {
             class Move() : TypeOnlyCommandData(), Commands
-            data class Issue(val nonce: Long = SecureRandom.getInstanceStrong().nextLong()) : Commands
+            data class Issue(val nonce: Long = newSecureRandom().nextLong()) : Commands
             data class Exit(val amount: Amount<Currency>) : Commands
         }
     }
@@ -107,4 +108,4 @@ class TransactionSerializationTests {
         assertEquals(tx.outputStates(), ltx.outputs)
         assertEquals(TEST_TX_TIME, ltx.commands.getTimestampBy(DUMMY_NOTARY)!!.midpoint)
     }
-}
\ No newline at end of file
+}