# Package org.apache.tomcat.util.security

- Class Summary
  Class | Description
  --- | ---
  ConcurrentMessageDigest | A thread safe wrapper around `MessageDigest` that does not make use of ThreadLocal and - broadly - only creates enough MessageDigest objects to satisfy the concurrency requirements.
  MD5Encoder | Encode an MD5 digest into a String.
  PrivilegedGetTccl |
  PrivilegedSetTccl |

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