Charsequence interface and MD5 Algorithm

1 charsequence Interface

CharsequenceYesCharA readable sequence of values. This interface is applicable to many different typesCharThe sequence provides unified read-only access. String, stringbuffer, and stringbuilder all implement this interface.

2. MD5 Algorithm

A typical application of MD5 is to generate a Message Digest (message-Digest) for a piece of information to check whether the obtained data is tampered.

MD5 can be cracked by dictionary: http://www.cmd5.com/