diff --git a/scm-core/src/main/java/sonia/scm/util/AbstractBase.java b/scm-core/src/main/java/sonia/scm/util/AbstractBase.java
new file mode 100644
index 0000000000..743a611540
--- /dev/null
+++ b/scm-core/src/main/java/sonia/scm/util/AbstractBase.java
@@ -0,0 +1,119 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.math.BigInteger;
+
+/**
+ * Abstract base class for encoding and decoding BaseX.
+ *
+ * @author Sebastian Sdorra
+ * @since 1.21
+ */
+public abstract class AbstractBase
+{
+
+  /**
+   * Decode a BaseX string to a BigInteger value.
+   *
+   *
+   * @param chars char table
+   * @param base base value
+   * @param value BaseX string to decode
+   *
+   * @return decoded value
+   */
+  protected static BigInteger decode(String chars, BigInteger base,
+    String value)
+  {
+    Preconditions.checkArgument(!Strings.isNullOrEmpty(value),
+      "string must not be empty");
+
+    BigInteger result = BigInteger.ZERO;
+    int digits = value.length();
+
+    for (int index = 0; index < digits; index++)
+    {
+      int digit = chars.indexOf(value.charAt(digits - index - 1));
+
+      result = result.add(BigInteger.valueOf(digit).multiply(base.pow(index)));
+    }
+
+    return result;
+  }
+
+  /**
+   * Encode BigInteger value to a BaseX string.
+   *
+   * 
+   * @param chars char table
+   * @param base base value
+   * @param value BigInteger value to encode
+   *
+   * @return encoded BaseX string
+   */
+  protected static String encode(String chars, BigInteger base,
+    BigInteger value)
+  {
+    Preconditions.checkArgument(value.compareTo(BigInteger.ZERO) >= 0,
+      "value must be positive");
+
+    StringBuilder buffer = new StringBuilder();
+
+    while (value.compareTo(BigInteger.ZERO) == 1)
+    {
+      BigInteger[] divmod = value.divideAndRemainder(base);
+
+      value = divmod[0];
+
+      int digit = divmod[1].intValue();
+
+      buffer.insert(0, chars.charAt(digit));
+    }
+
+    String result = buffer.toString();
+
+    if (result.length() == 0)
+    {
+      result = chars.substring(0, 1);
+    }
+
+    return result;
+  }
+}
diff --git a/scm-core/src/main/java/sonia/scm/util/Base32.java b/scm-core/src/main/java/sonia/scm/util/Base32.java
new file mode 100644
index 0000000000..4cbec9a8f0
--- /dev/null
+++ b/scm-core/src/main/java/sonia/scm/util/Base32.java
@@ -0,0 +1,80 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.math.BigInteger;
+
+/**
+ * Provides Base32 encoding and decoding for long values.
+ *
+ * @author Sebastian Sdorra
+ * @since 1.21
+ */
+public final class Base32 extends AbstractBase
+{
+
+  /** base value */
+  private static final BigInteger BASE = BigInteger.valueOf(32l);
+
+  /** char table */
+  private static final String CHARS = "0123456789bcdefghjkmnpqrstuvwxyz";
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Decode a Base32 string to a long value.
+   *
+   *
+   * @param value Base32 string value
+   *
+   * @return decoded long value
+   */
+  public static long decode(String value)
+  {
+    return decode(CHARS, BASE, value).longValue();
+  }
+
+  /**
+   * Encode long value to a Base32 string.
+   *
+   *
+   * @param value long value to encode
+   *
+   * @return encoded Base32 string
+   */
+  public static String encode(long value)
+  {
+    return encode(CHARS, BASE, BigInteger.valueOf(value));
+  }
+}
diff --git a/scm-core/src/main/java/sonia/scm/util/Base62.java b/scm-core/src/main/java/sonia/scm/util/Base62.java
new file mode 100644
index 0000000000..1922d39f95
--- /dev/null
+++ b/scm-core/src/main/java/sonia/scm/util/Base62.java
@@ -0,0 +1,81 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.math.BigInteger;
+
+/**
+ * Provides Base62 encoding and decoding for long values.
+ *
+ * @author Sebastian Sdorra
+ * @since 1.21
+ */
+public final class Base62 extends AbstractBase
+{
+
+  /** base value */
+  private static final BigInteger BASE = BigInteger.valueOf(62l);
+
+  /** char table */
+  private static final String CHARS =
+    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Decode a Base62 string to a long value.
+   *
+   *
+   * @param value Base62 string value
+   *
+   * @return decoded long value
+   */
+  public static long decode(String value)
+  {
+    return decode(CHARS, BASE, value).longValue();
+  }
+
+  /**
+   * Encode long value to a Base62 string.
+   *
+   *
+   * @param value long value to encode
+   *
+   * @return encoded Base62 string
+   */
+  public static String encode(long value)
+  {
+    return encode(CHARS, BASE, BigInteger.valueOf(value));
+  }
+}
diff --git a/scm-core/src/test/java/sonia/scm/util/Base32Test.java b/scm-core/src/test/java/sonia/scm/util/Base32Test.java
new file mode 100644
index 0000000000..5c2cdde601
--- /dev/null
+++ b/scm-core/src/test/java/sonia/scm/util/Base32Test.java
@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class Base32Test extends BaseXTestBase
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  @Override
+  protected long decode(String value)
+  {
+    return Base32.decode(value);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  @Override
+  protected String encode(long value)
+  {
+    return Base32.encode(value);
+  }
+}
diff --git a/scm-core/src/test/java/sonia/scm/util/Base62Test.java b/scm-core/src/test/java/sonia/scm/util/Base62Test.java
new file mode 100644
index 0000000000..006d662426
--- /dev/null
+++ b/scm-core/src/test/java/sonia/scm/util/Base62Test.java
@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class Base62Test extends BaseXTestBase
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  @Override
+  protected long decode(String value)
+  {
+    return Base62.decode(value);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  @Override
+  protected String encode(long value)
+  {
+    return Base62.encode(value);
+  }
+}
diff --git a/scm-core/src/test/java/sonia/scm/util/BaseXTestBase.java b/scm-core/src/test/java/sonia/scm/util/BaseXTestBase.java
new file mode 100644
index 0000000000..0b974bfcc7
--- /dev/null
+++ b/scm-core/src/test/java/sonia/scm/util/BaseXTestBase.java
@@ -0,0 +1,86 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.*;
+
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public abstract class BaseXTestBase
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  protected abstract long decode(String value);
+
+  /**
+   * Method description
+   *
+   *
+   * @param value
+   *
+   * @return
+   */
+  protected abstract String encode(long value);
+
+  /**
+   * Method description
+   *
+   */
+  @Test
+  public void testEncodeAndDecode()
+  {
+    long value = 1234;
+
+    String valueString = String.valueOf(value);
+
+    String enc = encode(value);
+
+    assertThat(enc, not(equalTo(valueString)));
+
+    assertEquals(value, decode(enc));
+  }
+}