diff --git a/phpseclib/Crypt/RC4.php b/phpseclib/Crypt/RC4.php
index 390108e0..98680577 100644
--- a/phpseclib/Crypt/RC4.php
+++ b/phpseclib/Crypt/RC4.php
@@ -14,7 +14,7 @@
  *  - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
  *
  * RC4 is also known as ARCFOUR or ARC4.  The reason is elaborated upon at Wikipedia.  This class is named RC4 and not
- * ARCFOUR or ARC4 because RC4 is how it is refered to in the SSH1 specification.
+ * ARCFOUR or ARC4 because RC4 is how it is referred to in the SSH1 specification.
  *
  * Here's a short example of how to use this library:
  * <code>
diff --git a/phpseclib/Crypt/Rijndael.php b/phpseclib/Crypt/Rijndael.php
index f8f1fff6..03f314d5 100644
--- a/phpseclib/Crypt/Rijndael.php
+++ b/phpseclib/Crypt/Rijndael.php
@@ -642,7 +642,7 @@ class Crypt_Rijndael {
      * Sets the key length
      *
      * Valid key lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
-     * 128.  If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
+     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
      *
      * @access public
      * @param Integer $length
@@ -720,7 +720,7 @@ class Crypt_Rijndael {
      * Sets the block length
      *
      * Valid block lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
-     * 128.  If the length is greater then 128 and invalid, it will be rounded down to the closest valid amount.
+     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
      *
      * @access public
      * @param Integer $length
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 39f6bc77..4212f37e 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -4330,7 +4330,7 @@ class File_X509 {
     {
         /*
             X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them above and beyond the ceritificate. ie.
-            some may have the following preceeding the -----BEGIN CERTIFICATE----- line:
+            some may have the following preceding the -----BEGIN CERTIFICATE----- line:
 
             Bag Attributes
                 localKeyID: 01 00 00 00
diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 9c295b5d..d47d61a3 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -222,7 +222,7 @@ class Math_BigInteger {
     var $bitmask = false;
 
     /**
-     * Mode independant value used for serialization.
+     * Mode independent value used for serialization.
      *
      * If the bcmath or gmp extensions are installed $this->value will be a non-serializable resource, hence the need for 
      * a variable that'll be serializable regardless of whether or not extensions are being used.  Unlike $this->value,
@@ -414,7 +414,7 @@ class Math_BigInteger {
             case  10:
             case -10:
                 // (?<!^)(?:-).*: find any -'s that aren't at the beginning and then any characters that follow that
-                // (?<=^|-)0*: find any 0's that are preceeded by the start of the string or by a - (ie. octals)
+                // (?<=^|-)0*: find any 0's that are preceded by the start of the string or by a - (ie. octals)
                 // [^-0-9].*: find any non-numeric characters and then any characters that follow that
                 $x = preg_replace('#(?<!^)(?:-).*|(?<=^|-)0*|[^-0-9].*#', '', $x);